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}; -static bool number_of_iterations_popcount (loop_p loop, edge exit, - enum tree_code code, - class tree_niter_desc *niter); - - /* Splits expression EXPR to a variable part VAR and constant OFFSET. */ static void @@ -2031,6 +2026,200 @@ number_of_iterations_cond (class loop *loop, return ret; } +/* Utility function to check if OP is defined by a stmt + that is a val - 1. */ + +static bool +ssa_defined_by_minus_one_stmt_p (tree op, tree val) +{ + gimple *stmt; + return (TREE_CODE (op) == SSA_NAME + && (stmt = SSA_NAME_DEF_STMT (op)) + && is_gimple_assign (stmt) + && (gimple_assign_rhs_code (stmt) == PLUS_EXPR) + && val == gimple_assign_rhs1 (stmt) + && integer_minus_onep (gimple_assign_rhs2 (stmt))); +} + +/* See if LOOP is a popcout implementation, determine NITER for the loop + + We match: + + goto + + + _1 = b_11 + -1 + b_6 = _1 & b_11 + + + b_11 = PHI + + exit block + if (b_11 != 0) + goto + else + goto + + OR we match copy-header version: + if (b_5 != 0) + goto + else + goto + + + b_11 = PHI + _1 = b_11 + -1 + b_6 = _1 & b_11 + + exit block + if (b_6 != 0) + goto + else + goto + + If popcount pattern, update NITER accordingly. + i.e., set NITER to __builtin_popcount (b) + return true if we did, false otherwise. + + */ + +static bool +number_of_iterations_popcount (loop_p loop, edge exit, + enum tree_code code, + class tree_niter_desc *niter) +{ + bool adjust = true; + tree iter; + HOST_WIDE_INT max; + adjust = true; + tree fn = NULL_TREE; + + /* Check loop terminating branch is like + if (b != 0). */ + gimple *stmt = last_stmt (exit->src); + if (!stmt + || gimple_code (stmt) != GIMPLE_COND + || code != NE_EXPR + || !integer_zerop (gimple_cond_rhs (stmt)) + || TREE_CODE (gimple_cond_lhs (stmt)) != SSA_NAME) + return false; + + gimple *and_stmt = SSA_NAME_DEF_STMT (gimple_cond_lhs (stmt)); + + /* Depending on copy-header is performed, feeding PHI stmts might be in + the loop header or loop latch, handle this. */ + if (gimple_code (and_stmt) == GIMPLE_PHI + && gimple_bb (and_stmt) == loop->header + && gimple_phi_num_args (and_stmt) == 2 + && (TREE_CODE (gimple_phi_arg_def (and_stmt, + loop_latch_edge (loop)->dest_idx)) + == SSA_NAME)) + { + /* SSA used in exit condition is defined by PHI stmt + b_11 = PHI + from the PHI stmt, get the and_stmt + b_6 = _1 & b_11. */ + tree t = gimple_phi_arg_def (and_stmt, loop_latch_edge (loop)->dest_idx); + and_stmt = SSA_NAME_DEF_STMT (t); + adjust = false; + } + + /* Make sure it is indeed an and stmt (b_6 = _1 & b_11). */ + if (!is_gimple_assign (and_stmt) + || gimple_assign_rhs_code (and_stmt) != BIT_AND_EXPR) + return false; + + tree b_11 = gimple_assign_rhs1 (and_stmt); + tree _1 = gimple_assign_rhs2 (and_stmt); + + /* Check that _1 is defined by _b11 + -1 (_1 = b_11 + -1). + Also make sure that b_11 is the same in and_stmt and _1 defining stmt. + Also canonicalize if _1 and _b11 are revrsed. */ + if (ssa_defined_by_minus_one_stmt_p (b_11, _1)) + std::swap (b_11, _1); + else if (ssa_defined_by_minus_one_stmt_p (_1, b_11)) + ; + else + return false; + /* Check the recurrence: + ... = PHI . */ + gimple *phi = SSA_NAME_DEF_STMT (b_11); + if (gimple_code (phi) != GIMPLE_PHI + || (gimple_bb (phi) != loop_latch_edge (loop)->dest) + || (gimple_assign_lhs (and_stmt) + != gimple_phi_arg_def (phi, loop_latch_edge (loop)->dest_idx))) + return false; + + /* We found a match. Get the corresponding popcount builtin. */ + tree src = gimple_phi_arg_def (phi, loop_preheader_edge (loop)->dest_idx); + if (TYPE_PRECISION (TREE_TYPE (src)) <= TYPE_PRECISION (integer_type_node)) + fn = builtin_decl_implicit (BUILT_IN_POPCOUNT); + else if (TYPE_PRECISION (TREE_TYPE (src)) + == TYPE_PRECISION (long_integer_type_node)) + fn = builtin_decl_implicit (BUILT_IN_POPCOUNTL); + else if (TYPE_PRECISION (TREE_TYPE (src)) + == TYPE_PRECISION (long_long_integer_type_node) + || (TYPE_PRECISION (TREE_TYPE (src)) + == 2 * TYPE_PRECISION (long_long_integer_type_node))) + fn = builtin_decl_implicit (BUILT_IN_POPCOUNTLL); + + if (!fn) + return false; + + /* Update NITER params accordingly */ + tree utype = unsigned_type_for (TREE_TYPE (src)); + src = fold_convert (utype, src); + if (TYPE_PRECISION (TREE_TYPE (src)) < TYPE_PRECISION (integer_type_node)) + src = fold_convert (unsigned_type_node, src); + tree call; + if (TYPE_PRECISION (TREE_TYPE (src)) + == 2 * TYPE_PRECISION (long_long_integer_type_node)) + { + int prec = TYPE_PRECISION (long_long_integer_type_node); + tree src1 = fold_convert (long_long_unsigned_type_node, + fold_build2 (RSHIFT_EXPR, TREE_TYPE (src), + unshare_expr (src), + build_int_cst (integer_type_node, + prec))); + tree src2 = fold_convert (long_long_unsigned_type_node, src); + call = build_call_expr (fn, 1, src1); + call = fold_build2 (PLUS_EXPR, TREE_TYPE (call), call, + build_call_expr (fn, 1, src2)); + call = fold_convert (utype, call); + } + else + call = fold_convert (utype, build_call_expr (fn, 1, src)); + if (adjust) + iter = fold_build2 (MINUS_EXPR, utype, call, build_int_cst (utype, 1)); + else + iter = call; + + if (TREE_CODE (call) == INTEGER_CST) + max = tree_to_uhwi (call); + else + max = TYPE_PRECISION (TREE_TYPE (src)); + if (adjust) + max = max - 1; + + niter->niter = iter; + niter->assumptions = boolean_true_node; + + if (adjust) + { + tree may_be_zero = fold_build2 (EQ_EXPR, boolean_type_node, src, + build_zero_cst (TREE_TYPE (src))); + niter->may_be_zero + = simplify_using_initial_conditions (loop, may_be_zero); + } + else + niter->may_be_zero = boolean_false_node; + + niter->max = max; + niter->bound = NULL_TREE; + niter->cmp = ERROR_MARK; + return true; +} + /* Substitute NEW_TREE for OLD in EXPR and fold the result. If VALUEIZE is non-NULL then OLD and NEW_TREE are ignored and instead all SSA names are replaced with the result of calling the VALUEIZE @@ -2648,203 +2837,6 @@ number_of_iterations_exit_assumptions (class loop *loop, edge exit, return (!integer_zerop (niter->assumptions)); } - -/* Utility function to check if OP is defined by a stmt - that is a val - 1. */ - -static bool -ssa_defined_by_minus_one_stmt_p (tree op, tree val) -{ - gimple *stmt; - return (TREE_CODE (op) == SSA_NAME - && (stmt = SSA_NAME_DEF_STMT (op)) - && is_gimple_assign (stmt) - && (gimple_assign_rhs_code (stmt) == PLUS_EXPR) - && val == gimple_assign_rhs1 (stmt) - && integer_minus_onep (gimple_assign_rhs2 (stmt))); -} - - -/* See if LOOP is a popcout implementation, determine NITER for the loop - - We match: - - goto - - - _1 = b_11 + -1 - b_6 = _1 & b_11 - - - b_11 = PHI - - exit block - if (b_11 != 0) - goto - else - goto - - OR we match copy-header version: - if (b_5 != 0) - goto - else - goto - - - b_11 = PHI - _1 = b_11 + -1 - b_6 = _1 & b_11 - - exit block - if (b_6 != 0) - goto - else - goto - - If popcount pattern, update NITER accordingly. - i.e., set NITER to __builtin_popcount (b) - return true if we did, false otherwise. - - */ - -static bool -number_of_iterations_popcount (loop_p loop, edge exit, - enum tree_code code, - class tree_niter_desc *niter) -{ - bool adjust = true; - tree iter; - HOST_WIDE_INT max; - adjust = true; - tree fn = NULL_TREE; - - /* Check loop terminating branch is like - if (b != 0). */ - gimple *stmt = last_stmt (exit->src); - if (!stmt - || gimple_code (stmt) != GIMPLE_COND - || code != NE_EXPR - || !integer_zerop (gimple_cond_rhs (stmt)) - || TREE_CODE (gimple_cond_lhs (stmt)) != SSA_NAME) - return false; - - gimple *and_stmt = SSA_NAME_DEF_STMT (gimple_cond_lhs (stmt)); - - /* Depending on copy-header is performed, feeding PHI stmts might be in - the loop header or loop latch, handle this. */ - if (gimple_code (and_stmt) == GIMPLE_PHI - && gimple_bb (and_stmt) == loop->header - && gimple_phi_num_args (and_stmt) == 2 - && (TREE_CODE (gimple_phi_arg_def (and_stmt, - loop_latch_edge (loop)->dest_idx)) - == SSA_NAME)) - { - /* SSA used in exit condition is defined by PHI stmt - b_11 = PHI - from the PHI stmt, get the and_stmt - b_6 = _1 & b_11. */ - tree t = gimple_phi_arg_def (and_stmt, loop_latch_edge (loop)->dest_idx); - and_stmt = SSA_NAME_DEF_STMT (t); - adjust = false; - } - - /* Make sure it is indeed an and stmt (b_6 = _1 & b_11). */ - if (!is_gimple_assign (and_stmt) - || gimple_assign_rhs_code (and_stmt) != BIT_AND_EXPR) - return false; - - tree b_11 = gimple_assign_rhs1 (and_stmt); - tree _1 = gimple_assign_rhs2 (and_stmt); - - /* Check that _1 is defined by _b11 + -1 (_1 = b_11 + -1). - Also make sure that b_11 is the same in and_stmt and _1 defining stmt. - Also canonicalize if _1 and _b11 are revrsed. */ - if (ssa_defined_by_minus_one_stmt_p (b_11, _1)) - std::swap (b_11, _1); - else if (ssa_defined_by_minus_one_stmt_p (_1, b_11)) - ; - else - return false; - /* Check the recurrence: - ... = PHI . */ - gimple *phi = SSA_NAME_DEF_STMT (b_11); - if (gimple_code (phi) != GIMPLE_PHI - || (gimple_bb (phi) != loop_latch_edge (loop)->dest) - || (gimple_assign_lhs (and_stmt) - != gimple_phi_arg_def (phi, loop_latch_edge (loop)->dest_idx))) - return false; - - /* We found a match. Get the corresponding popcount builtin. */ - tree src = gimple_phi_arg_def (phi, loop_preheader_edge (loop)->dest_idx); - if (TYPE_PRECISION (TREE_TYPE (src)) <= TYPE_PRECISION (integer_type_node)) - fn = builtin_decl_implicit (BUILT_IN_POPCOUNT); - else if (TYPE_PRECISION (TREE_TYPE (src)) - == TYPE_PRECISION (long_integer_type_node)) - fn = builtin_decl_implicit (BUILT_IN_POPCOUNTL); - else if (TYPE_PRECISION (TREE_TYPE (src)) - == TYPE_PRECISION (long_long_integer_type_node) - || (TYPE_PRECISION (TREE_TYPE (src)) - == 2 * TYPE_PRECISION (long_long_integer_type_node))) - fn = builtin_decl_implicit (BUILT_IN_POPCOUNTLL); - - if (!fn) - return false; - - /* Update NITER params accordingly */ - tree utype = unsigned_type_for (TREE_TYPE (src)); - src = fold_convert (utype, src); - if (TYPE_PRECISION (TREE_TYPE (src)) < TYPE_PRECISION (integer_type_node)) - src = fold_convert (unsigned_type_node, src); - tree call; - if (TYPE_PRECISION (TREE_TYPE (src)) - == 2 * TYPE_PRECISION (long_long_integer_type_node)) - { - int prec = TYPE_PRECISION (long_long_integer_type_node); - tree src1 = fold_convert (long_long_unsigned_type_node, - fold_build2 (RSHIFT_EXPR, TREE_TYPE (src), - unshare_expr (src), - build_int_cst (integer_type_node, - prec))); - tree src2 = fold_convert (long_long_unsigned_type_node, src); - call = build_call_expr (fn, 1, src1); - call = fold_build2 (PLUS_EXPR, TREE_TYPE (call), call, - build_call_expr (fn, 1, src2)); - call = fold_convert (utype, call); - } - else - call = fold_convert (utype, build_call_expr (fn, 1, src)); - if (adjust) - iter = fold_build2 (MINUS_EXPR, utype, call, build_int_cst (utype, 1)); - else - iter = call; - - if (TREE_CODE (call) == INTEGER_CST) - max = tree_to_uhwi (call); - else - max = TYPE_PRECISION (TREE_TYPE (src)); - if (adjust) - max = max - 1; - - niter->niter = iter; - niter->assumptions = boolean_true_node; - - if (adjust) - { - tree may_be_zero = fold_build2 (EQ_EXPR, boolean_type_node, src, - build_zero_cst (TREE_TYPE (src))); - niter->may_be_zero - = simplify_using_initial_conditions (loop, may_be_zero); - } - else - niter->may_be_zero = boolean_false_node; - - niter->max = max; - niter->bound = NULL_TREE; - niter->cmp = ERROR_MARK; - return true; -} - - /* Like number_of_iterations_exit_assumptions, but return TRUE only if the niter information holds unconditionally. */ From patchwork Fri Nov 11 13:52:40 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Carlotti X-Patchwork-Id: 18778 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:6687:0:0:0:0:0 with SMTP id l7csp753603wru; Fri, 11 Nov 2022 05:58:53 -0800 (PST) X-Google-Smtp-Source: AA0mqf7tqJG1jJXnaGIL7owpE0D6IOcxPHuxeyPN6uMPDLn2ptQZjwb0SSviNALQ6sRZZJzWEDNy X-Received: by 2002:a05:6402:e93:b0:461:e598:e0bb with SMTP id h19-20020a0564020e9300b00461e598e0bbmr1602311eda.21.1668175133821; Fri, 11 Nov 2022 05:58:53 -0800 (PST) Received: from sourceware.org (server2.sourceware.org. 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We create new number_of_iterations_bitcount function, which will be used to call the other bit-counting recognition functions added in subsequent patches, as well as a generic comment describing the loop structures that are common to each idiom. Some of the variables in number_of_iterations_popcount are given more descriptive names, and the popcount expression builder is extracted into a separate function. As part of the refactoring, we also fix a bug where the max loop count for modes shorter than an integer would be incorrectly computed as if the input mode were actually an integer. We also ensure that niter->max takes into account the final value for niter->niter (after any folding and simplifying), since if the latter is a constant, then record_estimate mandates that the two values are equivalent. gcc/ChangeLog: * tree-ssa-loop-niter.cc (number_of_iterations_exit_assumptions): Modify to call... (number_of_iterations_bitcount): ...this new function. (number_of_iterations_popcount): Now called by the above. Refactor, and extract popcount expression builder to... (build_popcount_expr): this new function. gcc/testsuite/ChangeLog: * gcc.dg/tree-ssa/popcount-max.c: New test. diff --git a/gcc/testsuite/gcc.dg/tree-ssa/popcount-max.c b/gcc/testsuite/gcc.dg/tree-ssa/popcount-max.c new file mode 100644 index 0000000000000000000000000000000000000000..ca7204cbc3cea636183408e24d7dd36d702ffdb2 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/popcount-max.c @@ -0,0 +1,33 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -fno-tree-loop-optimize -fdump-tree-optimized" } */ + +#define PREC (__CHAR_BIT__) + +int count1 (unsigned char b) { + int c = 0; + + while (b) { + b &= b - 1; + c++; + } + if (c <= PREC) + return 0; + else + return 34567; +} + +int count2 (unsigned char b) { + int c = 0; + + while (b) { + b &= b - 1; + c++; + } + if (c <= PREC - 1) + return 0; + else + return 76543; +} + +/* { dg-final { scan-tree-dump-times "34567" 0 "optimized" } } */ +/* { dg-final { scan-tree-dump-times "76543" 1 "optimized" } } */ diff --git a/gcc/tree-ssa-loop-niter.cc b/gcc/tree-ssa-loop-niter.cc index 0af34e46580bb9a6f9b40e09c9f29b8454a4aaf6..fece876099c1687569d6351e7d2416ea6acae5b5 100644 --- a/gcc/tree-ssa-loop-niter.cc +++ b/gcc/tree-ssa-loop-niter.cc @@ -2026,6 +2026,48 @@ number_of_iterations_cond (class loop *loop, return ret; } +/* Return an expression that computes the popcount of src. */ + +static tree +build_popcount_expr (tree src) +{ + tree fn; + int prec = TYPE_PRECISION (TREE_TYPE (src)); + int i_prec = TYPE_PRECISION (integer_type_node); + int li_prec = TYPE_PRECISION (long_integer_type_node); + int lli_prec = TYPE_PRECISION (long_long_integer_type_node); + if (prec <= i_prec) + fn = builtin_decl_implicit (BUILT_IN_POPCOUNT); + else if (prec == li_prec) + fn = builtin_decl_implicit (BUILT_IN_POPCOUNTL); + else if (prec == lli_prec || prec == 2 * lli_prec) + fn = builtin_decl_implicit (BUILT_IN_POPCOUNTLL); + else + return NULL_TREE; + + tree utype = unsigned_type_for (TREE_TYPE (src)); + src = fold_convert (utype, src); + if (prec < i_prec) + src = fold_convert (unsigned_type_node, src); + tree call; + if (prec == 2 * lli_prec) + { + tree src1 = fold_convert (long_long_unsigned_type_node, + fold_build2 (RSHIFT_EXPR, TREE_TYPE (src), + unshare_expr (src), + build_int_cst (integer_type_node, + lli_prec))); + tree src2 = fold_convert (long_long_unsigned_type_node, src); + tree call1 = build_call_expr (fn, 1, src1); + tree call2 = build_call_expr (fn, 1, src2); + call = fold_build2 (PLUS_EXPR, integer_type_node, call1, call2); + } + else + call = build_call_expr (fn, 1, src); + + return call; +} + /* Utility function to check if OP is defined by a stmt that is a val - 1. */ @@ -2041,45 +2083,18 @@ ssa_defined_by_minus_one_stmt_p (tree op, tree val) && integer_minus_onep (gimple_assign_rhs2 (stmt))); } -/* See if LOOP is a popcout implementation, determine NITER for the loop +/* See comment below for number_of_iterations_bitcount. + For popcount, we have: - We match: - - goto + modify: + _1 = iv_1 + -1 + iv_2 = iv_1 & _1 - - _1 = b_11 + -1 - b_6 = _1 & b_11 - - - b_11 = PHI + test: + if (iv != 0) - exit block - if (b_11 != 0) - goto - else - goto - - OR we match copy-header version: - if (b_5 != 0) - goto - else - goto - - - b_11 = PHI - _1 = b_11 + -1 - b_6 = _1 & b_11 - - exit block - if (b_6 != 0) - goto - else - goto - - If popcount pattern, update NITER accordingly. - i.e., set NITER to __builtin_popcount (b) - return true if we did, false otherwise. + modification count: + popcount (src) */ @@ -2088,138 +2103,150 @@ number_of_iterations_popcount (loop_p loop, edge exit, enum tree_code code, class tree_niter_desc *niter) { - bool adjust = true; - tree iter; + bool modify_before_test = true; HOST_WIDE_INT max; - adjust = true; - tree fn = NULL_TREE; - - /* Check loop terminating branch is like - if (b != 0). */ - gimple *stmt = last_stmt (exit->src); - if (!stmt - || gimple_code (stmt) != GIMPLE_COND + + /* Check that condition for staying inside the loop is like + if (iv != 0). */ + gimple *cond_stmt = last_stmt (exit->src); + if (!cond_stmt + || gimple_code (cond_stmt) != GIMPLE_COND || code != NE_EXPR - || !integer_zerop (gimple_cond_rhs (stmt)) - || TREE_CODE (gimple_cond_lhs (stmt)) != SSA_NAME) + || !integer_zerop (gimple_cond_rhs (cond_stmt)) + || TREE_CODE (gimple_cond_lhs (cond_stmt)) != SSA_NAME) return false; - gimple *and_stmt = SSA_NAME_DEF_STMT (gimple_cond_lhs (stmt)); + tree iv_2 = gimple_cond_lhs (cond_stmt); + gimple *iv_2_stmt = SSA_NAME_DEF_STMT (iv_2); - /* Depending on copy-header is performed, feeding PHI stmts might be in - the loop header or loop latch, handle this. */ - if (gimple_code (and_stmt) == GIMPLE_PHI - && gimple_bb (and_stmt) == loop->header - && gimple_phi_num_args (and_stmt) == 2 - && (TREE_CODE (gimple_phi_arg_def (and_stmt, + /* If the test comes before the iv modification, then these will actually be + iv_1 and a phi node. */ + if (gimple_code (iv_2_stmt) == GIMPLE_PHI + && gimple_bb (iv_2_stmt) == loop->header + && gimple_phi_num_args (iv_2_stmt) == 2 + && (TREE_CODE (gimple_phi_arg_def (iv_2_stmt, loop_latch_edge (loop)->dest_idx)) == SSA_NAME)) { - /* SSA used in exit condition is defined by PHI stmt - b_11 = PHI - from the PHI stmt, get the and_stmt - b_6 = _1 & b_11. */ - tree t = gimple_phi_arg_def (and_stmt, loop_latch_edge (loop)->dest_idx); - and_stmt = SSA_NAME_DEF_STMT (t); - adjust = false; + /* iv_2 is actually one of the inputs to the phi. */ + iv_2 = gimple_phi_arg_def (iv_2_stmt, loop_latch_edge (loop)->dest_idx); + iv_2_stmt = SSA_NAME_DEF_STMT (iv_2); + modify_before_test = false; } - /* Make sure it is indeed an and stmt (b_6 = _1 & b_11). */ - if (!is_gimple_assign (and_stmt) - || gimple_assign_rhs_code (and_stmt) != BIT_AND_EXPR) + /* Make sure iv_2_stmt is an and stmt (iv_2 = _1 & iv_1). */ + if (!is_gimple_assign (iv_2_stmt) + || gimple_assign_rhs_code (iv_2_stmt) != BIT_AND_EXPR) return false; - tree b_11 = gimple_assign_rhs1 (and_stmt); - tree _1 = gimple_assign_rhs2 (and_stmt); + tree iv_1 = gimple_assign_rhs1 (iv_2_stmt); + tree _1 = gimple_assign_rhs2 (iv_2_stmt); - /* Check that _1 is defined by _b11 + -1 (_1 = b_11 + -1). - Also make sure that b_11 is the same in and_stmt and _1 defining stmt. + /* Check that _1 is defined by (_1 = iv_1 + -1). + Also make sure that _1 is the same in and_stmt and _1 defining stmt. Also canonicalize if _1 and _b11 are revrsed. */ - if (ssa_defined_by_minus_one_stmt_p (b_11, _1)) - std::swap (b_11, _1); - else if (ssa_defined_by_minus_one_stmt_p (_1, b_11)) + if (ssa_defined_by_minus_one_stmt_p (iv_1, _1)) + std::swap (iv_1, _1); + else if (ssa_defined_by_minus_one_stmt_p (_1, iv_1)) ; else return false; - /* Check the recurrence: - ... = PHI . */ - gimple *phi = SSA_NAME_DEF_STMT (b_11); + + /* Check the recurrence. */ + gimple *phi = SSA_NAME_DEF_STMT (iv_1); if (gimple_code (phi) != GIMPLE_PHI || (gimple_bb (phi) != loop_latch_edge (loop)->dest) - || (gimple_assign_lhs (and_stmt) - != gimple_phi_arg_def (phi, loop_latch_edge (loop)->dest_idx))) + || (iv_2 != gimple_phi_arg_def (phi, loop_latch_edge (loop)->dest_idx))) return false; - /* We found a match. Get the corresponding popcount builtin. */ + /* We found a match. */ tree src = gimple_phi_arg_def (phi, loop_preheader_edge (loop)->dest_idx); - if (TYPE_PRECISION (TREE_TYPE (src)) <= TYPE_PRECISION (integer_type_node)) - fn = builtin_decl_implicit (BUILT_IN_POPCOUNT); - else if (TYPE_PRECISION (TREE_TYPE (src)) - == TYPE_PRECISION (long_integer_type_node)) - fn = builtin_decl_implicit (BUILT_IN_POPCOUNTL); - else if (TYPE_PRECISION (TREE_TYPE (src)) - == TYPE_PRECISION (long_long_integer_type_node) - || (TYPE_PRECISION (TREE_TYPE (src)) - == 2 * TYPE_PRECISION (long_long_integer_type_node))) - fn = builtin_decl_implicit (BUILT_IN_POPCOUNTLL); + int src_precision = TYPE_PRECISION (TREE_TYPE (src)); - if (!fn) + /* Get the corresponding popcount builtin. */ + tree expr = build_popcount_expr (src); + + if (!expr) return false; - /* Update NITER params accordingly */ - tree utype = unsigned_type_for (TREE_TYPE (src)); - src = fold_convert (utype, src); - if (TYPE_PRECISION (TREE_TYPE (src)) < TYPE_PRECISION (integer_type_node)) - src = fold_convert (unsigned_type_node, src); - tree call; - if (TYPE_PRECISION (TREE_TYPE (src)) - == 2 * TYPE_PRECISION (long_long_integer_type_node)) + max = src_precision; + + tree may_be_zero = boolean_false_node; + + if (modify_before_test) { - int prec = TYPE_PRECISION (long_long_integer_type_node); - tree src1 = fold_convert (long_long_unsigned_type_node, - fold_build2 (RSHIFT_EXPR, TREE_TYPE (src), - unshare_expr (src), - build_int_cst (integer_type_node, - prec))); - tree src2 = fold_convert (long_long_unsigned_type_node, src); - call = build_call_expr (fn, 1, src1); - call = fold_build2 (PLUS_EXPR, TREE_TYPE (call), call, - build_call_expr (fn, 1, src2)); - call = fold_convert (utype, call); + expr = fold_build2 (MINUS_EXPR, integer_type_node, expr, + integer_one_node); + max = max - 1; + may_be_zero = fold_build2 (EQ_EXPR, boolean_type_node, src, + build_zero_cst (TREE_TYPE (src))); } - else - call = fold_convert (utype, build_call_expr (fn, 1, src)); - if (adjust) - iter = fold_build2 (MINUS_EXPR, utype, call, build_int_cst (utype, 1)); - else - iter = call; - if (TREE_CODE (call) == INTEGER_CST) - max = tree_to_uhwi (call); - else - max = TYPE_PRECISION (TREE_TYPE (src)); - if (adjust) - max = max - 1; + expr = fold_convert (unsigned_type_node, expr); - niter->niter = iter; niter->assumptions = boolean_true_node; + niter->may_be_zero = simplify_using_initial_conditions (loop, may_be_zero); + niter->niter = simplify_using_initial_conditions(loop, expr); - if (adjust) - { - tree may_be_zero = fold_build2 (EQ_EXPR, boolean_type_node, src, - build_zero_cst (TREE_TYPE (src))); - niter->may_be_zero - = simplify_using_initial_conditions (loop, may_be_zero); - } + if (TREE_CODE (niter->niter) == INTEGER_CST) + niter->max = tree_to_uhwi (niter->niter); else - niter->may_be_zero = boolean_false_node; + niter->max = max; - niter->max = max; niter->bound = NULL_TREE; niter->cmp = ERROR_MARK; return true; } +/* See if LOOP contains a bit counting idiom. The idiom consists of two parts: + 1. A modification to the induction variabler;. + 2. A test to determine whether or not to exit the loop. + + These can come in either order - i.e.: + + + iv_1 = PHI + if (test (iv_1)) + goto + else + goto + + + iv_2 = modify (iv_1) + goto + + OR + + + iv_1 = PHI + iv_2 = modify (iv_1) + + + if (test (iv_2)) + goto + else + goto + + The second form can be generated by copying the loop header out of the loop. + + In the first case, the number of latch executions will be equal to the + number of induction variable modifications required before the test fails. + + In the second case (modify_before_test), if we assume that the number of + modifications required before the test fails is nonzero, then the number of + latch executions will be one less than this number. + + If we recognise the pattern, then we update niter accordingly, and return + true. */ + +static bool +number_of_iterations_bitcount (loop_p loop, edge exit, + enum tree_code code, + class tree_niter_desc *niter) +{ + return number_of_iterations_popcount (loop, exit, code, niter); +} + /* Substitute NEW_TREE for OLD in EXPR and fold the result. If VALUEIZE is non-NULL then OLD and NEW_TREE are ignored and instead all SSA names are replaced with the result of calling the VALUEIZE @@ -2758,7 +2785,7 @@ number_of_iterations_exit_assumptions (class loop *loop, edge exit, tree iv0_niters = NULL_TREE; if (!simple_iv_with_niters (loop, loop_containing_stmt (stmt), op0, &iv0, safe ? &iv0_niters : NULL, false)) - return number_of_iterations_popcount (loop, exit, code, niter); + return number_of_iterations_bitcount (loop, exit, code, niter); tree iv1_niters = NULL_TREE; if (!simple_iv_with_niters (loop, loop_containing_stmt (stmt), op1, &iv1, safe ? &iv1_niters : NULL, false)) From patchwork Fri Nov 11 18:43:05 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Carlotti X-Patchwork-Id: 18967 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:6687:0:0:0:0:0 with SMTP id l7csp909325wru; Fri, 11 Nov 2022 10:48:06 -0800 (PST) X-Google-Smtp-Source: AA0mqf7fWIyXv8jdkH3Ngf2ATuChICyfdpjxTyFq5EsZFGQ16iYxwXsf3MW1PJBPPt/LA1DAchh6 X-Received: by 2002:a17:906:1416:b0:78d:e869:f328 with SMTP id p22-20020a170906141600b0078de869f328mr2759496ejc.696.1668192486866; Fri, 11 Nov 2022 10:48:06 -0800 (PST) Received: from sourceware.org (server2.sourceware.org. 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The test is intended to verify that ivcanon can determine the loop count when the condition is given by a chain of constant computations. We replace the constant operations with a more complicated chain that should resist future idiom recognition. gcc/testsuite/ChangeLog: * gcc.dg/pr77975.c: Make tests more robust. diff --git a/gcc/testsuite/gcc.dg/pr77975.c b/gcc/testsuite/gcc.dg/pr77975.c index 148cebdded964da7fce148abdf2a430c55650513..a187ce2b50c2821841e71b5b6cb243a37a66fb57 100644 --- a/gcc/testsuite/gcc.dg/pr77975.c +++ b/gcc/testsuite/gcc.dg/pr77975.c @@ -7,10 +7,11 @@ unsigned int foo (unsigned int *b) { - unsigned int a = 3; + unsigned int a = 8; while (a) { - a >>= 1; + a += 5; + a &= 44; *b += a; } return a; @@ -21,10 +22,11 @@ foo (unsigned int *b) unsigned int bar (unsigned int *b) { - unsigned int a = 7; + unsigned int a = 3; while (a) { - a >>= 1; + a += 5; + a &= 44; *b += a; } return a; From patchwork Fri Nov 11 18:50:12 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Carlotti X-Patchwork-Id: 18973 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:6687:0:0:0:0:0 with SMTP id l7csp911501wru; Fri, 11 Nov 2022 10:53:44 -0800 (PST) X-Google-Smtp-Source: AA0mqf4UjQ2fsrKxnznvHdnveIRAXdE2FDR3PI1i5bRnNoeazdN4SzDpcJDkkZggLRdw/823+q7V X-Received: by 2002:a17:907:2b08:b0:78d:424c:fa2b with SMTP id gc8-20020a1709072b0800b0078d424cfa2bmr2952892ejc.546.1668192824815; Fri, 11 Nov 2022 10:53:44 -0800 (PST) Received: from sourceware.org (server2.sourceware.org. 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while (b) { b >>= 1; c++; } return c; } foo: .LFB11: .cfi_startproc cbz w0, .L3 clz w1, w0 tst x0, 1 mov w0, 32 sub w0, w0, w1 csel w0, w0, wzr, ne ret The conditional is unnecessary. phiopt could recognise a redundant csel (using cond_removal_in_builtin_zero_pattern) when one of the inputs is a clz call, but it cannot recognise the redunancy when the input is (e.g.) (32 - clz). I could perhaps extend this function to recognise this pattern in a later patch, if this is a good place to recognise more patterns. gcc/ChangeLog: * tree-scalar-evolution.cc (expression_expensive_p): Add checks for c[lt]z optabs. * tree-ssa-loop-niter.cc (build_cltz_expr): New. (number_of_iterations_cltz_complement): New. (number_of_iterations_bitcount): Add call to the above. gcc/testsuite/ChangeLog: * lib/target-supports.exp (check_effective_target_clz) (check_effective_target_clzl, check_effective_target_clzll) (check_effective_target_ctz, check_effective_target_clzl) (check_effective_target_ctzll): New. * gcc.dg/tree-ssa/cltz-complement-max.c: New test. * gcc.dg/tree-ssa/clz-complement-char.c: New test. * gcc.dg/tree-ssa/clz-complement-int.c: New test. * gcc.dg/tree-ssa/clz-complement-long-long.c: New test. * gcc.dg/tree-ssa/clz-complement-long.c: New test. * gcc.dg/tree-ssa/ctz-complement-char.c: New test. * gcc.dg/tree-ssa/ctz-complement-int.c: New test. * gcc.dg/tree-ssa/ctz-complement-long-long.c: New test. * gcc.dg/tree-ssa/ctz-complement-long.c: New test. diff --git a/gcc/testsuite/gcc.dg/tree-ssa/cltz-complement-max.c b/gcc/testsuite/gcc.dg/tree-ssa/cltz-complement-max.c new file mode 100644 index 0000000000000000000000000000000000000000..1a29ca52e42e50822e4e3213b2cb008b766d0318 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/cltz-complement-max.c @@ -0,0 +1,60 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -fno-tree-loop-optimize -fdump-tree-optimized" } */ + +#define PREC (__CHAR_BIT__) + +int clz_complement_count1 (unsigned char b) { + int c = 0; + + while (b) { + b >>= 1; + c++; + } + if (c <= PREC) + return 0; + else + return 34567; +} + +int clz_complement_count2 (unsigned char b) { + int c = 0; + + while (b) { + b >>= 1; + c++; + } + if (c <= PREC - 1) + return 0; + else + return 76543; +} + +int ctz_complement_count1 (unsigned char b) { + int c = 0; + + while (b) { + b <<= 1; + c++; + } + if (c <= PREC) + return 0; + else + return 23456; +} + +int ctz_complement_count2 (unsigned char b) { + int c = 0; + + while (b) { + b <<= 1; + c++; + } + if (c <= PREC - 1) + return 0; + else + return 65432; +} +/* { dg-final { scan-tree-dump-times "34567" 0 "optimized" } } */ +/* { dg-final { scan-tree-dump-times "76543" 1 "optimized" } } */ +/* { dg-final { scan-tree-dump-times "23456" 0 "optimized" } } */ +/* { dg-final { scan-tree-dump-times "65432" 1 "optimized" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/clz-complement-char.c b/gcc/testsuite/gcc.dg/tree-ssa/clz-complement-char.c new file mode 100644 index 0000000000000000000000000000000000000000..2ebe8fabcaf0ce88f3a6a46e9ba4ba79b7d3672e --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/clz-complement-char.c @@ -0,0 +1,31 @@ +/* { dg-do run } */ +/* { dg-require-effective-target clz } */ +/* { dg-options "-O2 -fdump-tree-optimized" } */ + +#define PREC (__CHAR_BIT__) + +int +__attribute__ ((noinline, noclone)) +foo (unsigned char b) { + int c = 0; + + while (b) { + b >>= 1; + c++; + } + + return c; +} + +int main() +{ + if (foo(0) != 0) + __builtin_abort (); + if (foo(5) != 3) + __builtin_abort (); + if (foo(255) != 8) + __builtin_abort (); + return 0; +} + +/* { dg-final { scan-tree-dump-times "__builtin_clz|\\.CLZ" 1 "optimized" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/clz-complement-int.c b/gcc/testsuite/gcc.dg/tree-ssa/clz-complement-int.c new file mode 100644 index 0000000000000000000000000000000000000000..f2c5c23f6a7d84ecb637c6961698b0fc30d7426b --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/clz-complement-int.c @@ -0,0 +1,31 @@ +/* { dg-do run } */ +/* { dg-require-effective-target clz } */ +/* { dg-options "-O2 -fdump-tree-optimized" } */ + +#define PREC (__CHAR_BIT__ * __SIZEOF_INT__) + +int +__attribute__ ((noinline, noclone)) +foo (unsigned int b) { + int c = 0; + + while (b) { + b >>= 1; + c++; + } + + return c; +} + +int main() +{ + if (foo(0) != 0) + __builtin_abort (); + if (foo(5) != 3) + __builtin_abort (); + if (foo(1 << (PREC - 1)) != PREC) + __builtin_abort (); + return 0; +} + +/* { dg-final { scan-tree-dump-times "__builtin_clz|\\.CLZ" 1 "optimized" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/clz-complement-long-long.c b/gcc/testsuite/gcc.dg/tree-ssa/clz-complement-long-long.c new file mode 100644 index 0000000000000000000000000000000000000000..7f7793f0efac1f0d793e6e99b84988e5cc5221c9 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/clz-complement-long-long.c @@ -0,0 +1,31 @@ +/* { dg-do run } */ +/* { dg-require-effective-target clzll } */ +/* { dg-options "-O2 -fdump-tree-optimized" } */ + +#define PREC (__CHAR_BIT__ * __SIZEOF_LONG_LONG__) + +int +__attribute__ ((noinline, noclone)) +foo (unsigned long long b) { + int c = 0; + + while (b) { + b >>= 1; + c++; + } + + return c; +} + +int main() +{ + if (foo(0) != 0) + __builtin_abort (); + if (foo(5) != 3) + __builtin_abort (); + if (foo(1LL << (PREC - 1)) != PREC) + __builtin_abort (); + return 0; +} + +/* { dg-final { scan-tree-dump-times "__builtin_clz|\\.CLZ" 1 "optimized" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/clz-complement-long.c b/gcc/testsuite/gcc.dg/tree-ssa/clz-complement-long.c new file mode 100644 index 0000000000000000000000000000000000000000..97161bb7a74260bea20e325ebab64acb33a2b696 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/clz-complement-long.c @@ -0,0 +1,31 @@ +/* { dg-do run } */ +/* { dg-require-effective-target clzl } */ +/* { dg-options "-O2 -fdump-tree-optimized" } */ + +#define PREC (__CHAR_BIT__ * __SIZEOF_LONG__) + +int +__attribute__ ((noinline, noclone)) +foo (unsigned long b) { + int c = 0; + + while (b) { + b >>= 1; + c++; + } + + return c; +} + +int main() +{ + if (foo(0) != 0) + __builtin_abort (); + if (foo(5) != 3) + __builtin_abort (); + if (foo(1L << (PREC - 1)) != PREC) + __builtin_abort (); + return 0; +} + +/* { dg-final { scan-tree-dump-times "__builtin_clz|\\.CLZ" 1 "optimized" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/ctz-complement-char.c b/gcc/testsuite/gcc.dg/tree-ssa/ctz-complement-char.c new file mode 100644 index 0000000000000000000000000000000000000000..b9afe8852d8ffbc7ee9a0760cf04b8f98af293a2 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/ctz-complement-char.c @@ -0,0 +1,31 @@ +/* { dg-do run } */ +/* { dg-require-effective-target ctz } */ +/* { dg-options "-O2 -fdump-tree-optimized" } */ + +#define PREC (__CHAR_BIT__) + +int +__attribute__ ((noinline, noclone)) +foo (unsigned char b) { + int c = 0; + + while (b) { + b <<= 1; + c++; + } + + return c; +} + +int main() +{ + if (foo(0) != 0) + __builtin_abort (); + if (foo(96) != PREC - 5) + __builtin_abort (); + if (foo(35) != PREC) + __builtin_abort (); + return 0; +} + +/* { dg-final { scan-tree-dump-times "__builtin_ctz|\\.CTZ" 1 "optimized" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/ctz-complement-int.c b/gcc/testsuite/gcc.dg/tree-ssa/ctz-complement-int.c new file mode 100644 index 0000000000000000000000000000000000000000..d2702a65daf34db66550d2255395db68a29a4797 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/ctz-complement-int.c @@ -0,0 +1,31 @@ +/* { dg-do run } */ +/* { dg-require-effective-target ctz } */ +/* { dg-options "-O2 -fdump-tree-optimized" } */ + +#define PREC (__CHAR_BIT__ * __SIZEOF_INT__) + +int +__attribute__ ((noinline, noclone)) +foo (unsigned int b) { + int c = 0; + + while (b) { + b <<= 1; + c++; + } + + return c; +} + +int main() +{ + if (foo(0) != 0) + __builtin_abort (); + if (foo(96) != PREC - 5) + __builtin_abort (); + if (foo(35) != PREC) + __builtin_abort (); + return 0; +} + +/* { dg-final { scan-tree-dump-times "__builtin_ctz|\\.CTZ" 1 "optimized" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/ctz-complement-long-long.c b/gcc/testsuite/gcc.dg/tree-ssa/ctz-complement-long-long.c new file mode 100644 index 0000000000000000000000000000000000000000..1ea0d5d7d9f8be1824c4177c33edd91e66b4ddab --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/ctz-complement-long-long.c @@ -0,0 +1,31 @@ +/* { dg-do run } */ +/* { dg-require-effective-target ctzll } */ +/* { dg-options "-O2 -fdump-tree-optimized" } */ + +#define PREC (__CHAR_BIT__ * __SIZEOF_LONG_LONG__) + +int +__attribute__ ((noinline, noclone)) +foo (unsigned long long b) { + int c = 0; + + while (b) { + b <<= 1; + c++; + } + + return c; +} + +int main() +{ + if (foo(0) != 0) + __builtin_abort (); + if (foo(96) != PREC - 5) + __builtin_abort (); + if (foo(35) != PREC) + __builtin_abort (); + return 0; +} + +/* { dg-final { scan-tree-dump-times "__builtin_ctz|\\.CTZ" 1 "optimized" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/ctz-complement-long.c b/gcc/testsuite/gcc.dg/tree-ssa/ctz-complement-long.c new file mode 100644 index 0000000000000000000000000000000000000000..80fb02dcfa68bc022ae69b26fb189323e01fc6fc --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/ctz-complement-long.c @@ -0,0 +1,31 @@ +/* { dg-do run } */ +/* { dg-require-effective-target ctzl } */ +/* { dg-options "-O2 -fdump-tree-optimized" } */ + +#define PREC (__CHAR_BIT__ * __SIZEOF_LONG__) + +int +__attribute__ ((noinline, noclone)) +foo (unsigned long b) { + int c = 0; + + while (b) { + b <<= 1; + c++; + } + + return c; +} + +int main() +{ + if (foo(0) != 0) + __builtin_abort (); + if (foo(96) != PREC - 5) + __builtin_abort (); + if (foo(35) != PREC) + __builtin_abort (); + return 0; +} + +/* { dg-final { scan-tree-dump-times "__builtin_ctz|\\.CTZ" 1 "optimized" } } */ diff --git a/gcc/testsuite/lib/target-supports.exp b/gcc/testsuite/lib/target-supports.exp index c7f583d6d1498401a7c106ed3f539dcd04f95451..325f12d62324793d6b2cf55b074ef6cc9cf4dd4d 100644 --- a/gcc/testsuite/lib/target-supports.exp +++ b/gcc/testsuite/lib/target-supports.exp @@ -8687,6 +8687,72 @@ proc check_effective_target_popcount { } { } "" ] } +# Return 1 if the target supports clz on int. + +proc check_effective_target_clz { } { + return [check_no_messages_and_pattern clz "!\\(call" rtl-expand { + int foo (int b) + { + return __builtin_clz (b); + } + } "" ] +} + +# Return 1 if the target supports clz on long. + +proc check_effective_target_clzl { } { + return [check_no_messages_and_pattern clzl "!\\(call" rtl-expand { + int foo (long b) + { + return __builtin_clzl (b); + } + } "" ] +} + +# Return 1 if the target supports clz on long long. + +proc check_effective_target_clzll { } { + return [check_no_messages_and_pattern clzll "!\\(call" rtl-expand { + int foo (long long b) + { + return __builtin_clzll (b); + } + } "" ] +} + +# Return 1 if the target supports ctz on int. + +proc check_effective_target_ctz { } { + return [check_no_messages_and_pattern ctz "!\\(call" rtl-expand { + int foo (int b) + { + return __builtin_ctz (b); + } + } "" ] +} + +# Return 1 if the target supports ctz on long. + +proc check_effective_target_ctzl { } { + return [check_no_messages_and_pattern ctzl "!\\(call" rtl-expand { + int foo (long b) + { + return __builtin_ctzl (b); + } + } "" ] +} + +# Return 1 if the target supports ctz on long long. + +proc check_effective_target_ctzll { } { + return [check_no_messages_and_pattern ctzll "!\\(call" rtl-expand { + int foo (long long b) + { + return __builtin_ctzll (b); + } + } "" ] +} + # Return 1 if the target supports atomic operations on "long long" # and can execute them. # diff --git a/gcc/tree-scalar-evolution.cc b/gcc/tree-scalar-evolution.cc index 7e2a3e986619de87e4ae9daf16198be1f13b917c..1ac9526c69b5fe80c26022f2fa1176d222e2dfb9 100644 --- a/gcc/tree-scalar-evolution.cc +++ b/gcc/tree-scalar-evolution.cc @@ -3406,12 +3406,21 @@ expression_expensive_p (tree expr, hash_map &cache, library call for popcount when backend does not have an instruction to do so. We consider this to be expensive and generate __builtin_popcount only when backend defines it. */ + optab optab; combined_fn cfn = get_call_combined_fn (expr); switch (cfn) { CASE_CFN_POPCOUNT: + optab = popcount_optab; + goto bitcount_call; + CASE_CFN_CLZ: + optab = clz_optab; + goto bitcount_call; + CASE_CFN_CTZ: + optab = ctz_optab; +bitcount_call: /* Check if opcode for popcount is available in the mode required. */ - if (optab_handler (popcount_optab, + if (optab_handler (optab, TYPE_MODE (TREE_TYPE (CALL_EXPR_ARG (expr, 0)))) == CODE_FOR_nothing) { @@ -3424,7 +3433,7 @@ expression_expensive_p (tree expr, hash_map &cache, instructions. */ if (is_a (mode, &int_mode) && GET_MODE_SIZE (int_mode) == 2 * UNITS_PER_WORD - && (optab_handler (popcount_optab, word_mode) + && (optab_handler (optab, word_mode) != CODE_FOR_nothing)) break; return true; diff --git a/gcc/tree-ssa-loop-niter.cc b/gcc/tree-ssa-loop-niter.cc index fece876099c1687569d6351e7d2416ea6acae5b5..16e8e25919d808cea27adbd72f0be01ae2f0e547 100644 --- a/gcc/tree-ssa-loop-niter.cc +++ b/gcc/tree-ssa-loop-niter.cc @@ -2198,6 +2198,195 @@ number_of_iterations_popcount (loop_p loop, edge exit, return true; } +/* Return an expression that counts the leading/trailing zeroes of src. */ + +static tree +build_cltz_expr (tree src, bool leading, bool defined_at_zero) +{ + tree fn; + int prec = TYPE_PRECISION (TREE_TYPE (src)); + int i_prec = TYPE_PRECISION (integer_type_node); + int li_prec = TYPE_PRECISION (long_integer_type_node); + int lli_prec = TYPE_PRECISION (long_long_integer_type_node); + if (prec <= i_prec) + fn = leading ? builtin_decl_implicit (BUILT_IN_CLZ) + : builtin_decl_implicit (BUILT_IN_CTZ); + else if (prec == li_prec) + fn = leading ? builtin_decl_implicit (BUILT_IN_CLZL) + : builtin_decl_implicit (BUILT_IN_CTZL); + else if (prec == lli_prec || prec == 2 * lli_prec) + fn = leading ? builtin_decl_implicit (BUILT_IN_CLZLL) + : builtin_decl_implicit (BUILT_IN_CTZLL); + else + return NULL_TREE; + + tree utype = unsigned_type_for (TREE_TYPE (src)); + src = fold_convert (utype, src); + if (prec < i_prec) + src = fold_convert (unsigned_type_node, src); + + tree call; + if (prec == 2 * lli_prec) + { + tree src1 = fold_convert (long_long_unsigned_type_node, + fold_build2 (RSHIFT_EXPR, TREE_TYPE (src), + unshare_expr (src), + build_int_cst (integer_type_node, + lli_prec))); + tree src2 = fold_convert (long_long_unsigned_type_node, src); + /* We count the zeroes in src1, and add the number in src2 when src1 + is 0. */ + if (!leading) + std::swap(src1, src2); + tree call1 = build_call_expr (fn, 1, src1); + tree call2 = build_call_expr (fn, 1, src2); + if (defined_at_zero) + { + tree is_zero2 = fold_build2 (NE_EXPR, boolean_type_node, src2, + build_zero_cst (TREE_TYPE (src2))); + call2 = fold_build3(COND_EXPR, integer_type_node, is_zero2, call2, + build_int_cst (integer_type_node, lli_prec)); + } + tree is_zero1 = fold_build2 (NE_EXPR, boolean_type_node, src1, + build_zero_cst (TREE_TYPE (src1))); + call = fold_build3(COND_EXPR, integer_type_node, is_zero1, call1, + fold_build2 (PLUS_EXPR, integer_type_node, call2, + build_int_cst (integer_type_node, + lli_prec))); + } + else + { + call = build_call_expr (fn, 1, src); + if (defined_at_zero) + { + tree is_zero = fold_build2 (NE_EXPR, boolean_type_node, src, + build_zero_cst (TREE_TYPE (src))); + call = fold_build3(COND_EXPR, integer_type_node, is_zero, call, + build_int_cst (integer_type_node, prec)); + } + } + + if (leading && prec < i_prec) + call = fold_build2(MINUS_EXPR, integer_type_node, call, + build_int_cst (integer_type_node, + i_prec - prec)); + + return call; +} + +/* See comment below for number_of_iterations_bitcount. + For c[lt]z complement, we have: + + modify: + iv_2 = iv_1 >> 1 OR iv_1 << 1 + + test: + if (iv != 0) + + modification count: + src precision - c[lt]z (src) + + */ + +static bool +number_of_iterations_cltz_complement (loop_p loop, edge exit, + enum tree_code code, + class tree_niter_desc *niter) +{ + bool modify_before_test = true; + HOST_WIDE_INT max; + + /* Check that condition for staying inside the loop is like + if (iv != 0). */ + gimple *cond_stmt = last_stmt (exit->src); + if (!cond_stmt + || gimple_code (cond_stmt) != GIMPLE_COND + || code != NE_EXPR + || !integer_zerop (gimple_cond_rhs (cond_stmt)) + || TREE_CODE (gimple_cond_lhs (cond_stmt)) != SSA_NAME) + return false; + + tree iv_2 = gimple_cond_lhs (cond_stmt); + gimple *iv_2_stmt = SSA_NAME_DEF_STMT (iv_2); + + /* If the test comes before the iv modification, then these will actually be + iv_1 and a phi node. */ + if (gimple_code (iv_2_stmt) == GIMPLE_PHI + && gimple_bb (iv_2_stmt) == loop->header + && gimple_phi_num_args (iv_2_stmt) == 2 + && (TREE_CODE (gimple_phi_arg_def (iv_2_stmt, + loop_latch_edge (loop)->dest_idx)) + == SSA_NAME)) + { + /* iv_2 is actually one of the inputs to the phi. */ + iv_2 = gimple_phi_arg_def (iv_2_stmt, loop_latch_edge (loop)->dest_idx); + iv_2_stmt = SSA_NAME_DEF_STMT (iv_2); + modify_before_test = false; + } + + /* Make sure iv_2_stmt is a logical shift by one stmt: + iv_2 = iv_1 {>>|<<} 1 */ + if (!is_gimple_assign (iv_2_stmt) + || (gimple_assign_rhs_code (iv_2_stmt) != LSHIFT_EXPR + && (gimple_assign_rhs_code (iv_2_stmt) != RSHIFT_EXPR + || !TYPE_UNSIGNED (TREE_TYPE (gimple_assign_lhs (iv_2_stmt))))) + || !integer_onep (gimple_assign_rhs2 (iv_2_stmt))) + return false; + + bool left_shift = (gimple_assign_rhs_code (iv_2_stmt) == LSHIFT_EXPR); + + tree iv_1 = gimple_assign_rhs1 (iv_2_stmt); + + /* Check the recurrence. */ + gimple *phi = SSA_NAME_DEF_STMT (iv_1); + if (gimple_code (phi) != GIMPLE_PHI + || (gimple_bb (phi) != loop_latch_edge (loop)->dest) + || (iv_2 != gimple_phi_arg_def (phi, loop_latch_edge (loop)->dest_idx))) + return false; + + /* We found a match. */ + tree src = gimple_phi_arg_def (phi, loop_preheader_edge (loop)->dest_idx); + int src_precision = TYPE_PRECISION (TREE_TYPE (src)); + + /* Get the corresponding c[lt]z builtin. */ + tree expr = build_cltz_expr (src, !left_shift, true); + + if (!expr) + return false; + + expr = fold_build2 (MINUS_EXPR, integer_type_node, + build_int_cst (integer_type_node, src_precision), + expr); + + max = src_precision; + + tree may_be_zero = boolean_false_node; + + if (modify_before_test) + { + expr = fold_build2 (MINUS_EXPR, integer_type_node, expr, + integer_one_node); + max = max - 1; + may_be_zero = fold_build2 (EQ_EXPR, boolean_type_node, src, + build_zero_cst (TREE_TYPE (src))); + } + + expr = fold_convert (unsigned_type_node, expr); + + niter->assumptions = boolean_true_node; + niter->may_be_zero = simplify_using_initial_conditions (loop, may_be_zero); + niter->niter = simplify_using_initial_conditions (loop, expr); + + if (TREE_CODE (niter->niter) == INTEGER_CST) + niter->max = tree_to_uhwi (niter->niter); + else + niter->max = max; + + niter->bound = NULL_TREE; + niter->cmp = ERROR_MARK; + return true; +} + /* See if LOOP contains a bit counting idiom. The idiom consists of two parts: 1. A modification to the induction variabler;. 2. A test to determine whether or not to exit the loop. @@ -2244,7 +2433,8 @@ number_of_iterations_bitcount (loop_p loop, edge exit, enum tree_code code, class tree_niter_desc *niter) { - return number_of_iterations_popcount (loop, exit, code, niter); + return (number_of_iterations_popcount (loop, exit, code, niter) + || number_of_iterations_cltz_complement (loop, exit, code, niter)); } /* Substitute NEW_TREE for OLD in EXPR and fold the result. 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CTRY:IE; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:64aa7808-outbound-1.mta.getcheckrecipient.com; PTR:ec2-63-35-35-123.eu-west-1.compute.amazonaws.com; CAT:NONE; SFS:(13230022)(4636009)(396003)(39860400002)(136003)(346002)(376002)(451199015)(40470700004)(46966006)(36840700001)(84970400001)(44832011)(2906002)(70586007)(70206006)(8936002)(30864003)(5660300002)(8676002)(41300700001)(316002)(40480700001)(356005)(81166007)(6486002)(478600001)(6512007)(26005)(82310400005)(6666004)(6506007)(186003)(36860700001)(82740400003)(86362001)(40460700003)(336012)(6916009)(47076005)(67856001); DIR:OUT; SFP:1101; X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Nov 2022 19:05:24.6533 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b4bff7da-9eb9-4662-16bf-08dac417b054 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d; Ip=[63.35.35.123]; Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: VI1EUR03FT049.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR08MB5358 X-Spam-Status: No, score=-13.0 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, FORGED_SPF_HELO, GIT_PATCH_0, KAM_DMARC_NONE, KAM_LOTSOFHASH, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_PASS, SPF_NONE, TXREP, UNPARSEABLE_RELAY autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Andrew Carlotti via Gcc-patches From: Andrew Carlotti Reply-To: Andrew Carlotti Errors-To: gcc-patches-bounces+ouuuleilei=gmail.com@gcc.gnu.org Sender: "Gcc-patches" X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1749227753931422094?= X-GMAIL-MSGID: =?utf-8?q?1749227753931422094?= This recognises the patterns of the form: while (n & 1) { n >>= 1 } Unfortunately there are currently two issues relating to this patch. Firstly, simplify_using_initial_conditions does not recognise that (n != 0) and ((n & 1) == 0) implies that ((n >> 1) != 0). This preconditions arise following the loop copy-header pass, and the assumptions returned by number_of_iterations_exit_assumptions then prevent final value replacement from using the niter result. I'm not sure what is the best way to fix this - one approach could be to modify simplify_using_initial_conditions to handle this sort of case, but it seems that it basically wants the information that ranger could give anway, so would something like that be a better option? The second issue arises in the vectoriser, which is able to determine that the niter->assumptions are always true. When building with -march=armv8.4-a+sve -S -O3, we get this codegen: foo (unsigned int b) { int c = 0; if (b == 0) return PREC; while (!(b & (1 << (PREC - 1)))) { b <<= 1; c++; } return c; } foo: .LFB0: .cfi_startproc cmp w0, 0 cbz w0, .L6 blt .L7 lsl w1, w0, 1 clz w2, w1 cmp w2, 14 bls .L8 mov x0, 0 cntw x3 add w1, w2, 1 index z1.s, #0, #1 whilelo p0.s, wzr, w1 .L4: add x0, x0, x3 mov p1.b, p0.b mov z0.d, z1.d whilelo p0.s, w0, w1 incw z1.s b.any .L4 add z0.s, z0.s, #1 lastb w0, p1, z0.s ret .p2align 2,,3 .L8: mov w0, 0 b .L3 .p2align 2,,3 .L13: lsl w1, w1, 1 .L3: add w0, w0, 1 tbz w1, #31, .L13 ret .p2align 2,,3 .L6: mov w0, 32 ret .p2align 2,,3 .L7: mov w0, 0 ret .cfi_endproc In essence, the vectoriser uses the niter information to determine exactly how many iterations of the loop it needs to run. It then uses SVE whilelo instructions to run this number of iterations. The original loop counter is also vectorised, despite only being used in the final iteration, and then the final value of this counter is used as the return value (which is the same as the number of iterations it computed in the first place). This vectorisation is obviously bad, and I think it exposes a latent bug in the vectoriser, rather than being an issue caused by this specific patch. gcc/ChangeLog: * tree-ssa-loop-niter.cc (number_of_iterations_cltz): New. (number_of_iterations_bitcount): Add call to the above. (number_of_iterations_exit_assumptions): Add EQ_EXPR case for c[lt]z idiom recognition. gcc/testsuite/ChangeLog: * gcc.dg/tree-ssa/cltz-max.c: New test. * gcc.dg/tree-ssa/clz-char.c: New test. * gcc.dg/tree-ssa/clz-int.c: New test. * gcc.dg/tree-ssa/clz-long-long.c: New test. * gcc.dg/tree-ssa/clz-long.c: New test. * gcc.dg/tree-ssa/ctz-char.c: New test. * gcc.dg/tree-ssa/ctz-int.c: New test. * gcc.dg/tree-ssa/ctz-long-long.c: New test. * gcc.dg/tree-ssa/ctz-long.c: New test. diff --git a/gcc/testsuite/gcc.dg/tree-ssa/cltz-max.c b/gcc/testsuite/gcc.dg/tree-ssa/cltz-max.c new file mode 100644 index 0000000000000000000000000000000000000000..a6bea3d338940efee2e7e1c95a5941525945af9e --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/cltz-max.c @@ -0,0 +1,72 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -fno-tree-loop-optimize -fdump-tree-optimized" } */ + +#define PREC (__CHAR_BIT__) + +int clz_count1 (unsigned char b) { + int c = 0; + + if (b == 0) + return 0; + + while (!(b & (1 << (PREC - 1)))) { + b <<= 1; + c++; + } + if (c <= PREC - 1) + return 0; + else + return 34567; +} + +int clz_count2 (unsigned char b) { + int c = 0; + + if (b == 0) + return 0; + + while (!(b & (1 << PREC - 1))) { + b <<= 1; + c++; + } + if (c <= PREC - 2) + return 0; + else + return 76543; +} + +int ctz_count1 (unsigned char b) { + int c = 0; + + if (b == 0) + return 0; + + while (!(b & 1)) { + b >>= 1; + c++; + } + if (c <= PREC - 1) + return 0; + else + return 23456; +} + +int ctz_count2 (unsigned char b) { + int c = 0; + + if (b == 0) + return 0; + + while (!(b & 1)) { + b >>= 1; + c++; + } + if (c <= PREC - 2) + return 0; + else + return 65432; +} +/* { dg-final { scan-tree-dump-times "34567" 0 "optimized" } } */ +/* { dg-final { scan-tree-dump-times "76543" 1 "optimized" } } */ +/* { dg-final { scan-tree-dump-times "23456" 0 "optimized" } } */ +/* { dg-final { scan-tree-dump-times "65432" 1 "optimized" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/clz-char.c b/gcc/testsuite/gcc.dg/tree-ssa/clz-char.c new file mode 100644 index 0000000000000000000000000000000000000000..4a122db95bbb576b4ade706bd3b1ca809d2f1e3b --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/clz-char.c @@ -0,0 +1,34 @@ +/* { dg-do run } */ +/* { dg-require-effective-target clzl } */ +/* { dg-options "-O2 -fno-tree-ch -fdump-tree-optimized" } */ + +#define PREC (__CHAR_BIT__) + +int +__attribute__ ((noinline, noclone)) +foo (unsigned char b) { + int c = 0; + + if (b == 0) + return PREC; + + while (!(b & (1 << (PREC - 1)))) { + b <<= 1; + c++; + } + + return c; +} + +int main() +{ + if (foo(0) != PREC) + __builtin_abort (); + if (foo(1 << (PREC - 1)) != 0) + __builtin_abort (); + if (foo(35) != PREC - 6) + __builtin_abort (); + return 0; +} + +/* { dg-final { scan-tree-dump-times "__builtin_clz|\\.CLZ" 1 "optimized" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/clz-int.c b/gcc/testsuite/gcc.dg/tree-ssa/clz-int.c new file mode 100644 index 0000000000000000000000000000000000000000..96646f8e19cd5b2342acb88949b3ef6e3e2abd5a --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/clz-int.c @@ -0,0 +1,34 @@ +/* { dg-do run } */ +/* { dg-require-effective-target clzl } */ +/* { dg-options "-O2 -fno-tree-ch -fdump-tree-optimized" } */ + +#define PREC (__CHAR_BIT__ * __SIZEOF_INT__) + +int +__attribute__ ((noinline, noclone)) +foo (unsigned int b) { + int c = 0; + + if (b == 0) + return PREC; + + while (!(b & (1 << (PREC - 1)))) { + b <<= 1; + c++; + } + + return c; +} + +int main() +{ + if (foo(0) != PREC) + __builtin_abort (); + if (foo(1 << (PREC - 1)) != 0) + __builtin_abort (); + if (foo(35) != PREC - 6) + __builtin_abort (); + return 0; +} + +/* { dg-final { scan-tree-dump-times "__builtin_clz|\\.CLZ" 1 "optimized" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/clz-long-long.c b/gcc/testsuite/gcc.dg/tree-ssa/clz-long-long.c new file mode 100644 index 0000000000000000000000000000000000000000..80d3edc1dab2e74fc3271ba9d97640839b3a3786 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/clz-long-long.c @@ -0,0 +1,34 @@ +/* { dg-do run } */ +/* { dg-require-effective-target clzll } */ +/* { dg-options "-O2 -fno-tree-ch -fdump-tree-optimized" } */ + +#define PREC (__CHAR_BIT__ * __SIZEOF_LONG_LONG__) + +int +__attribute__ ((noinline, noclone)) +foo (unsigned long long b) { + int c = 0; + + if (b == 0) + return PREC; + + while (!(b & (1LL << (PREC - 1)))) { + b <<= 1; + c++; + } + + return c; +} + +int main() +{ + if (foo(0) != PREC) + __builtin_abort (); + if (foo(1LL << (PREC - 1)) != 0) + __builtin_abort (); + if (foo(35) != PREC - 6) + __builtin_abort (); + return 0; +} + +/* { dg-final { scan-tree-dump-times "__builtin_clz|\\.CLZ" 1 "optimized" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/clz-long.c b/gcc/testsuite/gcc.dg/tree-ssa/clz-long.c new file mode 100644 index 0000000000000000000000000000000000000000..1c8037f93b9c9d42f580a172267c65723a46ef8b --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/clz-long.c @@ -0,0 +1,34 @@ +/* { dg-do run } */ +/* { dg-require-effective-target clzl } */ +/* { dg-options "-O2 -fno-tree-ch -fdump-tree-optimized" } */ + +#define PREC (__CHAR_BIT__ * __SIZEOF_LONG__) + +int +__attribute__ ((noinline, noclone)) +foo (unsigned long b) { + int c = 0; + + if (b == 0) + return PREC; + + while (!(b & (1L << (PREC - 1)))) { + b <<= 1; + c++; +} + + return c; +} + +int main() +{ + if (foo(0) != PREC) + __builtin_abort (); + if (foo(1L << (PREC - 1)) != 0) + __builtin_abort (); + if (foo(35) != PREC - 6) + __builtin_abort (); + return 0; +} + +/* { dg-final { scan-tree-dump-times "__builtin_clz|\\.CLZ" 1 "optimized" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/ctz-char.c b/gcc/testsuite/gcc.dg/tree-ssa/ctz-char.c new file mode 100644 index 0000000000000000000000000000000000000000..3cd166acbd4670e175d79a2403de2d5a4fd38665 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/ctz-char.c @@ -0,0 +1,36 @@ +/* { dg-do run } */ +/* { dg-require-effective-target ctz } */ +/* { dg-options "-O2 -fno-tree-ch -fdump-tree-optimized" } */ + +#define PREC (__CHAR_BIT__) + +int +__attribute__ ((noinline, noclone)) +foo (unsigned char b) { + int c = 0; + + if (b == 0) + return PREC; + + while (!(b & 1)) { + b >>= 1; + c++; + } + + return c; +} + +int main() +{ + if (foo(0) != PREC) + __builtin_abort (); + if (foo(128) != 7) + __builtin_abort (); + if (foo(96) != 5) + __builtin_abort (); + if (foo(35) != 0) + __builtin_abort (); + return 0; +} + +/* { dg-final { scan-tree-dump-times "__builtin_ctz|\\.CTZ" 1 "optimized" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/ctz-int.c b/gcc/testsuite/gcc.dg/tree-ssa/ctz-int.c new file mode 100644 index 0000000000000000000000000000000000000000..7f63493eb7389a18516f8f126c3c55dc80f0bde6 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/ctz-int.c @@ -0,0 +1,36 @@ +/* { dg-do run } */ +/* { dg-require-effective-target ctz } */ +/* { dg-options "-O2 -fno-tree-ch -fdump-tree-optimized" } */ + +#define PREC (__CHAR_BIT__ * __SIZEOF_INT__) + +int +__attribute__ ((noinline, noclone)) +foo (unsigned int b) { + int c = 0; + + if (b == 0) + return PREC; + + while (!(b & 1)) { + b >>= 1; + c++; + } + + return c; +} + +int main() +{ + if (foo(0) != PREC) + __builtin_abort (); + if (foo(1 << (PREC - 1)) != PREC - 1) + __builtin_abort (); + if (foo(96) != 5) + __builtin_abort (); + if (foo(35) != 0) + __builtin_abort (); + return 0; +} + +/* { dg-final { scan-tree-dump-times "__builtin_ctz|\\.CTZ" 1 "optimized" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/ctz-long-long.c b/gcc/testsuite/gcc.dg/tree-ssa/ctz-long-long.c new file mode 100644 index 0000000000000000000000000000000000000000..924f61b76f01c77a40b9fff64af3b629ab1418c0 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/ctz-long-long.c @@ -0,0 +1,36 @@ +/* { dg-do run } */ +/* { dg-require-effective-target ctzll } */ +/* { dg-options "-O2 -fno-tree-ch -fdump-tree-optimized" } */ + +#define PREC (__CHAR_BIT__ * __SIZEOF_LONG_LONG__) + +int +__attribute__ ((noinline, noclone)) +foo (unsigned long long b) { + int c = 0; + + if (b == 0) + return PREC; + + while (!(b & 1)) { + b >>= 1; + c++; + } + + return c; +} + +int main() +{ + if (foo(0) != PREC) + __builtin_abort (); + if (foo(1LL << (PREC - 1)) != PREC - 1) + __builtin_abort (); + if (foo(96) != 5) + __builtin_abort (); + if (foo(35) != 0) + __builtin_abort (); + return 0; +} + +/* { dg-final { scan-tree-dump-times "__builtin_ctz|\\.CTZ" 1 "optimized" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/ctz-long.c b/gcc/testsuite/gcc.dg/tree-ssa/ctz-long.c new file mode 100644 index 0000000000000000000000000000000000000000..178945daa8a2697989f1a1a0804ce33d768dcc55 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/ctz-long.c @@ -0,0 +1,36 @@ +/* { dg-do run } */ +/* { dg-require-effective-target ctzl } */ +/* { dg-options "-O2 -fno-tree-ch -fdump-tree-optimized" } */ + +#define PREC (__CHAR_BIT__ * __SIZEOF_LONG__) + +int +__attribute__ ((noinline, noclone)) +foo (unsigned long b) { + int c = 0; + + if (b == 0) + return PREC; + + while (!(b & 1)) { + b >>= 1; + c++; + } + + return c; +} + +int main() +{ + if (foo(0) != PREC) + __builtin_abort (); + if (foo(1L << (PREC - 1)) != PREC - 1) + __builtin_abort (); + if (foo(96) != 5) + __builtin_abort (); + if (foo(35) != 0) + __builtin_abort (); + return 0; +} + +/* { dg-final { scan-tree-dump-times "__builtin_ctz|\\.CTZ" 1 "optimized" } } */ diff --git a/gcc/tree-ssa-loop-niter.cc b/gcc/tree-ssa-loop-niter.cc index 16e8e25919d808cea27adbd72f0be01ae2f0e547..87e6fe81d68fc3352e450688ef79e6fc68854d8a 100644 --- a/gcc/tree-ssa-loop-niter.cc +++ b/gcc/tree-ssa-loop-niter.cc @@ -2274,6 +2274,167 @@ build_cltz_expr (tree src, bool leading, bool defined_at_zero) return call; } +/* See comment below for number_of_iterations_bitcount. + For c[lt]z, we have: + + modify: + iv_2 = iv_1 << 1 OR iv_1 >> 1 + + test: + if (iv & 1 << (prec-1)) OR (iv & 1) + + modification count: + src precision - c[lt]z (src) + + */ + +static bool +number_of_iterations_cltz (loop_p loop, edge exit, + enum tree_code code, + class tree_niter_desc *niter) +{ + bool modify_before_test = true; + HOST_WIDE_INT max; + int checked_bit; + tree iv_2; + + /* Check that condition for staying inside the loop is like + if (iv == 0). */ + gimple *cond_stmt = last_stmt (exit->src); + if (!cond_stmt + || gimple_code (cond_stmt) != GIMPLE_COND + || (code != EQ_EXPR && code != GE_EXPR) + || !integer_zerop (gimple_cond_rhs (cond_stmt)) + || TREE_CODE (gimple_cond_lhs (cond_stmt)) != SSA_NAME) + return false; + + if (code == EQ_EXPR) + { + /* Make sure we check a bitwise and with a suitable constant */ + gimple *and_stmt = SSA_NAME_DEF_STMT (gimple_cond_lhs (cond_stmt)); + if (!is_gimple_assign (and_stmt) + || gimple_assign_rhs_code (and_stmt) != BIT_AND_EXPR + || !integer_pow2p (gimple_assign_rhs2 (and_stmt))) + return false; + + checked_bit = tree_log2 (gimple_assign_rhs2 (and_stmt)); + + iv_2 = gimple_assign_rhs1 (and_stmt); + } + else + { + /* We have a GE_EXPR - a signed comparison with zero is equivalent to + testing the leading bit, so check for this pattern too. */ + + iv_2 = gimple_cond_lhs (cond_stmt); + tree test_value_type = TREE_TYPE (iv_2); + + if (TYPE_UNSIGNED (test_value_type)) + return false; + + gimple *test_value_stmt = SSA_NAME_DEF_STMT (iv_2); + + if (is_gimple_assign (test_value_stmt) + && gimple_assign_rhs_code (test_value_stmt) == NOP_EXPR) + { + /* If the test value comes from a NOP_EXPR, then we need to unwrap + this. We conservatively require that both types have the same + precision. */ + iv_2 = gimple_assign_rhs1 (test_value_stmt); + tree rhs_type = TREE_TYPE (iv_2); + if (TREE_CODE (rhs_type) != INTEGER_TYPE + || (TYPE_PRECISION (rhs_type) + != TYPE_PRECISION (test_value_type))) + return false; + } + + checked_bit = TYPE_PRECISION (test_value_type) - 1; + } + + gimple *iv_2_stmt = SSA_NAME_DEF_STMT (iv_2); + + /* If the test comes before the iv modification, then these will actually be + iv_1 and a phi node. */ + if (gimple_code (iv_2_stmt) == GIMPLE_PHI + && gimple_bb (iv_2_stmt) == loop->header + && gimple_phi_num_args (iv_2_stmt) == 2 + && (TREE_CODE (gimple_phi_arg_def (iv_2_stmt, + loop_latch_edge (loop)->dest_idx)) + == SSA_NAME)) + { + /* iv_2 is actually one of the inputs to the phi. */ + iv_2 = gimple_phi_arg_def (iv_2_stmt, loop_latch_edge (loop)->dest_idx); + iv_2_stmt = SSA_NAME_DEF_STMT (iv_2); + modify_before_test = false; + } + + /* Make sure iv_2_stmt is a logical shift by one stmt: + iv_2 = iv_1 {<<|>>} 1 */ + if (!is_gimple_assign (iv_2_stmt) + || (gimple_assign_rhs_code (iv_2_stmt) != LSHIFT_EXPR + && (gimple_assign_rhs_code (iv_2_stmt) != RSHIFT_EXPR + || !TYPE_UNSIGNED (TREE_TYPE (gimple_assign_lhs (iv_2_stmt))))) + || !integer_onep (gimple_assign_rhs2 (iv_2_stmt))) + return false; + + bool left_shift = (gimple_assign_rhs_code (iv_2_stmt) == LSHIFT_EXPR); + + tree iv_1 = gimple_assign_rhs1 (iv_2_stmt); + + /* Check the recurrence. */ + gimple *phi = SSA_NAME_DEF_STMT (iv_1); + if (gimple_code (phi) != GIMPLE_PHI + || (gimple_bb (phi) != loop_latch_edge (loop)->dest) + || (iv_2 != gimple_phi_arg_def (phi, loop_latch_edge (loop)->dest_idx))) + return false; + + /* We found a match. */ + tree src = gimple_phi_arg_def (phi, loop_preheader_edge (loop)->dest_idx); + int src_precision = TYPE_PRECISION (TREE_TYPE (src)); + + /* Apply any needed preprocessing to src. */ + int num_ignored_bits; + if (left_shift) + num_ignored_bits = src_precision - checked_bit - 1; + else + num_ignored_bits = checked_bit; + + if (modify_before_test) + num_ignored_bits++; + + if (num_ignored_bits != 0) + src = fold_build2 (left_shift ? LSHIFT_EXPR : RSHIFT_EXPR, + TREE_TYPE (src), src, + build_int_cst (integer_type_node, num_ignored_bits)); + + /* Get the corresponding c[lt]z builtin. */ + tree expr = build_cltz_expr (src, left_shift, false); + + if (!expr) + return false; + + max = src_precision - num_ignored_bits - 1; + + expr = fold_convert (unsigned_type_node, expr); + + tree assumptions = fold_build2 (NE_EXPR, boolean_type_node, src, + build_zero_cst (TREE_TYPE (src))); + + niter->assumptions = simplify_using_initial_conditions (loop, assumptions); + niter->may_be_zero = boolean_false_node; + niter->niter = simplify_using_initial_conditions (loop, expr); + + if (TREE_CODE (niter->niter) == INTEGER_CST) + niter->max = tree_to_uhwi (niter->niter); + else + niter->max = max; + + niter->bound = NULL_TREE; + niter->cmp = ERROR_MARK; + + return true; +} + /* See comment below for number_of_iterations_bitcount. For c[lt]z complement, we have: @@ -2434,6 +2595,7 @@ number_of_iterations_bitcount (loop_p loop, edge exit, class tree_niter_desc *niter) { return (number_of_iterations_popcount (loop, exit, code, niter) + || number_of_iterations_cltz (loop, exit, code, niter) || number_of_iterations_cltz_complement (loop, exit, code, niter)); } @@ -2960,6 +3122,9 @@ number_of_iterations_exit_assumptions (class loop *loop, edge exit, case NE_EXPR: break; + case EQ_EXPR: + return number_of_iterations_cltz (loop, exit, code, niter); + default: return false; } From patchwork Fri Nov 11 19:07:18 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Carlotti X-Patchwork-Id: 18979 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:6687:0:0:0:0:0 with SMTP id l7csp919823wru; Fri, 11 Nov 2022 11:12:26 -0800 (PST) X-Google-Smtp-Source: AA0mqf6WHvXe26Xfj61f30f1KONZnAtL3HDZV5Kh6KSWFBJMx1q9fQTTBhHJHmeWnNCdIQVpQOZ4 X-Received: by 2002:a17:906:1dcc:b0:78d:8c1f:9dbe with SMTP id v12-20020a1709061dcc00b0078d8c1f9dbemr3026852ejh.230.1668193946362; Fri, 11 Nov 2022 11:12:26 -0800 (PST) Received: from sourceware.org (server2.sourceware.org. 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/* The upper bound on the number of iterations of - the loop. */ + the loop. If niter is constant, then these values + must agree. */ /* The simplified shape of the exit condition. This information is used by loop unrolling. If CMP is ERROR_MARK, then the loop cannot be unrolled. From patchwork Thu Dec 22 17:43:21 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Carlotti X-Patchwork-Id: 35891 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:adf:e747:0:0:0:0:0 with SMTP id c7csp81181wrn; Thu, 22 Dec 2022 09:44:32 -0800 (PST) X-Google-Smtp-Source: AMrXdXsMHLI85PomVHC0NmpVrA7vu8m1Ew+TLTdrXD2+D2UFrkhpAIGpLhrK4k559I9TjZLfkLT6 X-Received: by 2002:a17:907:88cb:b0:7bf:1072:2246 with SMTP id rq11-20020a17090788cb00b007bf10722246mr5396609ejc.38.1671731072452; Thu, 22 Dec 2022 09:44:32 -0800 (PST) Received: from sourceware.org (server2.sourceware.org. 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} -/* { dg-final { scan-tree-dump-times "__builtin_popcount" 1 "optimized" } } */ +/* { dg-final { scan-tree-dump-times "__builtin_popcount|\\.POPCOUNT" 1 "optimized" } } */ /* { dg-final { scan-tree-dump-times "if" 0 "phiopt4" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/popcount.c b/gcc/testsuite/gcc.dg/tree-ssa/popcount.c index b4694109411a4631697463519acbe7d9df65bf6e..efd906a0f5447f0beb3752eded3756999b02e6e6 100644 --- a/gcc/testsuite/gcc.dg/tree-ssa/popcount.c +++ b/gcc/testsuite/gcc.dg/tree-ssa/popcount.c @@ -39,4 +39,4 @@ void PopCount3 (long b1) { } } -/* { dg-final { scan-tree-dump-times "__builtin_popcount" 3 "optimized" } } */ +/* { dg-final { scan-tree-dump-times "__builtin_popcount|\\.POPCOUNT" 3 "optimized" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/popcount2.c b/gcc/testsuite/gcc.dg/tree-ssa/popcount2.c index ef73e345573de721833e98e89c252640a55f7c60..ae38a329bd4d868a762300d3218d68864c0fc4be 100644 --- a/gcc/testsuite/gcc.dg/tree-ssa/popcount2.c +++ b/gcc/testsuite/gcc.dg/tree-ssa/popcount2.c @@ -26,4 +26,4 @@ int main() return 0; } -/* { dg-final { scan-tree-dump-times "__builtin_popcount" 1 "optimized" } } */ +/* { dg-final { scan-tree-dump-times "__builtin_popcount|\\.POPCOUNT" 1 "optimized" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/popcount3.c b/gcc/testsuite/gcc.dg/tree-ssa/popcount3.c index ef438916a8019320564f444ace08e2f4b4190684..50befb36bac75de1cfa282e38358278b3288bd1c 100644 --- a/gcc/testsuite/gcc.dg/tree-ssa/popcount3.c +++ b/gcc/testsuite/gcc.dg/tree-ssa/popcount3.c @@ -12,5 +12,5 @@ int PopCount (long b) { return c; } -/* { dg-final { scan-tree-dump-times "__builtin_popcount" 1 "optimized" } } */ +/* { dg-final { scan-tree-dump-times "__builtin_popcount|\\.POPCOUNT" 1 "optimized" } } */ /* { dg-final { scan-tree-dump-times "if" 0 "phiopt4" } } */ diff --git a/gcc/testsuite/gcc.target/aarch64/popcount4.c b/gcc/testsuite/gcc.target/aarch64/popcount4.c index ee55b2e335223053ca024e95b7a13aa4af32550e..8aa15ff018d4b5fc6bb59e52af20d5c33cea2ee0 100644 --- a/gcc/testsuite/gcc.target/aarch64/popcount4.c +++ b/gcc/testsuite/gcc.target/aarch64/popcount4.c @@ -11,4 +11,4 @@ int PopCount (long b) { return c; } -/* { dg-final { scan-tree-dump-times "__builtin_popcount" 0 "optimized" } } */ +/* { dg-final { scan-tree-dump-times "__builtin_popcount|\\.POPCOUNT" 0 "optimized" } } */ diff --git a/gcc/testsuite/gcc.target/i386/pr95771-2.c b/gcc/testsuite/gcc.target/i386/pr95771-2.c new file mode 100644 index 0000000000000000000000000000000000000000..1db9dc94d0b66477667624012221d6844c141a26 --- /dev/null +++ b/gcc/testsuite/gcc.target/i386/pr95771-2.c @@ -0,0 +1,17 @@ +/* PR tree-optimization/95771 */ +/* { dg-do compile } */ +/* { dg-require-effective-target int128 } */ +/* { dg-options "-O2 -mpopcnt -fdump-tree-optimized" } */ +/* { dg-final { scan-tree-dump " = __builtin_popcount| = \\.POPCOUNT" "optimized" } } */ + +int +corge (unsigned __int128 x) +{ + int i = 0; + while (x) + { + x &= x - 1; + ++i; + } + return i; +} diff --git a/gcc/testsuite/gcc.target/i386/pr95771.c b/gcc/testsuite/gcc.target/i386/pr95771.c index d7b67017800b705b9854f561916c20901ea76803..d41be445f4a68613a082b8956fea3ceaf33d7e0f 100644 --- a/gcc/testsuite/gcc.target/i386/pr95771.c +++ b/gcc/testsuite/gcc.target/i386/pr95771.c @@ -1,8 +1,7 @@ /* PR tree-optimization/95771 */ /* { dg-do compile } */ /* { dg-options "-O2 -mpopcnt -fdump-tree-optimized" } */ -/* { dg-final { scan-tree-dump-times " = __builtin_popcount" 6 "optimized" { target int128 } } } */ -/* { dg-final { scan-tree-dump-times " = __builtin_popcount" 4 "optimized" { target { ! int128 } } } } */ +/* { dg-final { scan-tree-dump-times " = __builtin_popcount| = \\.POPCOUNT" 4 "optimized" } } */ int foo (unsigned char x) @@ -51,17 +50,3 @@ qux (unsigned long long x) } return i; } - -#ifdef __SIZEOF_INT128__ -int -corge (unsigned __int128 x) -{ - int i = 0; - while (x) - { - x &= x - 1; - ++i; - } - return i; -} -#endif diff --git a/gcc/tree-ssa-loop-niter.cc b/gcc/tree-ssa-loop-niter.cc index 9c2f9f3d5f6205bb5e7f490257800c660fdd0b8d..cc53b27329f8518bc2cacef1830768a140331b31 100644 --- a/gcc/tree-ssa-loop-niter.cc +++ b/gcc/tree-ssa-loop-niter.cc @@ -2033,11 +2033,18 @@ static tree build_popcount_expr (tree src) { tree fn; + bool use_ifn = false; int prec = TYPE_PRECISION (TREE_TYPE (src)); int i_prec = TYPE_PRECISION (integer_type_node); int li_prec = TYPE_PRECISION (long_integer_type_node); int lli_prec = TYPE_PRECISION (long_long_integer_type_node); - if (prec <= i_prec) + + tree utype = unsigned_type_for (TREE_TYPE (src)); + src = fold_convert (utype, src); + + if (direct_internal_fn_supported_p (IFN_POPCOUNT, utype, OPTIMIZE_FOR_BOTH)) + use_ifn = true; + else if (prec <= i_prec) fn = builtin_decl_implicit (BUILT_IN_POPCOUNT); else if (prec == li_prec) fn = builtin_decl_implicit (BUILT_IN_POPCOUNTL); @@ -2046,12 +2053,11 @@ build_popcount_expr (tree src) else return NULL_TREE; - tree utype = unsigned_type_for (TREE_TYPE (src)); - src = fold_convert (utype, src); - if (prec < i_prec) - src = fold_convert (unsigned_type_node, src); tree call; - if (prec == 2 * lli_prec) + if (use_ifn) + call = build_call_expr_internal_loc (UNKNOWN_LOCATION, IFN_POPCOUNT, + integer_type_node, 1, src); + else if (prec == 2 * lli_prec) { tree src1 = fold_convert (long_long_unsigned_type_node, fold_build2 (RSHIFT_EXPR, TREE_TYPE (src), @@ -2064,7 +2070,12 @@ build_popcount_expr (tree src) call = fold_build2 (PLUS_EXPR, integer_type_node, call1, call2); } else - call = build_call_expr (fn, 1, src); + { + if (prec < i_prec) + src = fold_convert (unsigned_type_node, src); + + call = build_call_expr (fn, 1, src); + } return call; }