[1/4] middle-end Support not decomposing specific divisions during vectorization.

Hi All,

In plenty of image and video processing code it's common to modify pixel values
by a widening operation and then scale them back into range by dividing by 255.

e.g.:

   x = y / (2 ^ (bitsize (y)/2)-1

This patch adds a new target hook can_special_div_by_const, similar to
can_vec_perm which can be called to check if a target will handle a particular
division in a special way in the back-end.

The vectorizer will then vectorize the division using the standard tree code
and at expansion time the hook is called again to generate the code for the
division.

Alot of the changes in the patch are to pass down the tree operands in all paths
that can lead to the divmod expansion so that the target hook always has the
type of the expression you're expanding since the types can change the
expansion.

Bootstrapped Regtested on aarch64-none-linux-gnu, x86_64-pc-linux-gnu
and no issues.

Ok for master?

Thanks,
Tamar

gcc/ChangeLog:

	* expmed.h (expand_divmod): Pass tree operands down in addition to RTX.
	* expmed.cc (expand_divmod): Likewise.
	* explow.cc (round_push, align_dynamic_address): Likewise.
	* expr.cc (force_operand, expand_expr_divmod): Likewise.
	* optabs.cc (expand_doubleword_mod, expand_doubleword_divmod):
	Likewise.
	* target.h: Include tree-core.
	* target.def (can_special_div_by_const): New.
	* targhooks.cc (default_can_special_div_by_const): New.
	* targhooks.h (default_can_special_div_by_const): New.
	* tree-vect-generic.cc (expand_vector_operation): Use it.
	* doc/tm.texi.in: Document it.
	* doc/tm.texi: Regenerate.
	* tree-vect-patterns.cc (vect_recog_divmod_pattern): Check for support.
	* tree-vect-stmts.cc (vectorizable_operation): Likewise.

gcc/testsuite/ChangeLog:

	* gcc.dg/vect/vect-div-bitmask-1.c: New test.
	* gcc.dg/vect/vect-div-bitmask-2.c: New test.
	* gcc.dg/vect/vect-div-bitmask-3.c: New test.
	* gcc.dg/vect/vect-div-bitmask.h: New file.

--- inline copy of patch --

diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi
index 92bda1a7e14a3c9ea63e151e4a49a818bf4d1bdb..adba9fe97a9b43729c5e86d244a2a23e76cac097 100644




--
diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi
index 92bda1a7e14a3c9ea63e151e4a49a818bf4d1bdb..adba9fe97a9b43729c5e86d244a2a23e76cac097 100644
--- a/gcc/doc/tm.texi
+++ b/gcc/doc/tm.texi
@@ -6112,6 +6112,22 @@ instruction pattern.  There is no need for the hook to handle these two
 implementation approaches itself.
 @end deftypefn
 
+@deftypefn {Target Hook} bool TARGET_VECTORIZE_CAN_SPECIAL_DIV_BY_CONST (enum @var{tree_code}, tree @var{vectype}, tree @var{treeop0}, tree @var{treeop1}, rtx *@var{output}, rtx @var{in0}, rtx @var{in1})
+This hook is used to test whether the target has a special method of
+division of vectors of type @var{vectype} using the two operands @code{treeop0},
+and @code{treeop1} and producing a vector of type @var{vectype}.  The division
+will then not be decomposed by the and kept as a div.
+
+When the hook is being used to test whether the target supports a special
+divide, @var{in0}, @var{in1}, and @var{output} are all null.  When the hook
+is being used to emit a division, @var{in0} and @var{in1} are the source
+vectors of type @var{vecttype} and @var{output} is the destination vector of
+type @var{vectype}.
+
+Return true if the operation is possible, emitting instructions for it
+if rtxes are provided and updating @var{output}.
+@end deftypefn
+
 @deftypefn {Target Hook} tree TARGET_VECTORIZE_BUILTIN_VECTORIZED_FUNCTION (unsigned @var{code}, tree @var{vec_type_out}, tree @var{vec_type_in})
 This hook should return the decl of a function that implements the
 vectorized variant of the function with the @code{combined_fn} code
diff --git a/gcc/doc/tm.texi.in b/gcc/doc/tm.texi.in
index 112462310b134705d860153294287cfd7d4af81d..d5a745a02acdf051ea1da1b04076d058c24ce093 100644
--- a/gcc/doc/tm.texi.in
+++ b/gcc/doc/tm.texi.in
@@ -4164,6 +4164,8 @@ address;  but often a machine-dependent strategy can generate better code.
 
 @hook TARGET_VECTORIZE_VEC_PERM_CONST
 
+@hook TARGET_VECTORIZE_CAN_SPECIAL_DIV_BY_CONST
+
 @hook TARGET_VECTORIZE_BUILTIN_VECTORIZED_FUNCTION
 
 @hook TARGET_VECTORIZE_BUILTIN_MD_VECTORIZED_FUNCTION
diff --git a/gcc/explow.cc b/gcc/explow.cc
index ddb4d6ae3600542f8d2bb5617cdd3933a9fae6c0..568e0eb1a158c696458ae678f5e346bf34ba0036 100644
--- a/gcc/explow.cc
+++ b/gcc/explow.cc
@@ -1037,7 +1037,7 @@ round_push (rtx size)
      TRUNC_DIV_EXPR.  */
   size = expand_binop (Pmode, add_optab, size, alignm1_rtx,
 		       NULL_RTX, 1, OPTAB_LIB_WIDEN);
-  size = expand_divmod (0, TRUNC_DIV_EXPR, Pmode, size, align_rtx,
+  size = expand_divmod (0, TRUNC_DIV_EXPR, Pmode, NULL, NULL, size, align_rtx,
 			NULL_RTX, 1);
   size = expand_mult (Pmode, size, align_rtx, NULL_RTX, 1);
 
@@ -1203,7 +1203,7 @@ align_dynamic_address (rtx target, unsigned required_align)
 			 gen_int_mode (required_align / BITS_PER_UNIT - 1,
 				       Pmode),
 			 NULL_RTX, 1, OPTAB_LIB_WIDEN);
-  target = expand_divmod (0, TRUNC_DIV_EXPR, Pmode, target,
+  target = expand_divmod (0, TRUNC_DIV_EXPR, Pmode, NULL, NULL, target,
 			  gen_int_mode (required_align / BITS_PER_UNIT,
 					Pmode),
 			  NULL_RTX, 1);
diff --git a/gcc/expmed.h b/gcc/expmed.h
index 0b2538c4c6bd51dfdc772ef70bdf631c0bed8717..0db2986f11ff4a4b10b59501c6f33cb3595659b5 100644
--- a/gcc/expmed.h
+++ b/gcc/expmed.h
@@ -708,8 +708,9 @@ extern rtx expand_variable_shift (enum tree_code, machine_mode,
 extern rtx expand_shift (enum tree_code, machine_mode, rtx, poly_int64, rtx,
 			 int);
 #ifdef GCC_OPTABS_H
-extern rtx expand_divmod (int, enum tree_code, machine_mode, rtx, rtx,
-			  rtx, int, enum optab_methods = OPTAB_LIB_WIDEN);
+extern rtx expand_divmod (int, enum tree_code, machine_mode, tree, tree,
+			  rtx, rtx, rtx, int,
+			  enum optab_methods = OPTAB_LIB_WIDEN);
 #endif
 #endif
 
diff --git a/gcc/expmed.cc b/gcc/expmed.cc
index 8d7418be418406e72a895ecddf2dc7fdb950c76c..b64ea5ac46a9da85770a5bb0990db8b97d3af414 100644
--- a/gcc/expmed.cc
+++ b/gcc/expmed.cc
@@ -4222,8 +4222,8 @@ expand_sdiv_pow2 (scalar_int_mode mode, rtx op0, HOST_WIDE_INT d)
 
 rtx
 expand_divmod (int rem_flag, enum tree_code code, machine_mode mode,
-	       rtx op0, rtx op1, rtx target, int unsignedp,
-	       enum optab_methods methods)
+	       tree treeop0, tree treeop1, rtx op0, rtx op1, rtx target,
+	       int unsignedp, enum optab_methods methods)
 {
   machine_mode compute_mode;
   rtx tquotient;
@@ -4375,6 +4375,14 @@ expand_divmod (int rem_flag, enum tree_code code, machine_mode mode,
 
   last_div_const = ! rem_flag && op1_is_constant ? INTVAL (op1) : 0;
 
+  /* Check if the target has specific expansions for the division.  */
+  if (treeop0
+      && targetm.vectorize.can_special_div_by_const (code, TREE_TYPE (treeop0),
+						     treeop0, treeop1,
+						     &target, op0, op1))
+    return target;
+
+
   /* Now convert to the best mode to use.  */
   if (compute_mode != mode)
     {
@@ -4618,8 +4626,8 @@ expand_divmod (int rem_flag, enum tree_code code, machine_mode mode,
 			    || (optab_handler (sdivmod_optab, int_mode)
 				!= CODE_FOR_nothing)))
 		      quotient = expand_divmod (0, TRUNC_DIV_EXPR,
-						int_mode, op0,
-						gen_int_mode (abs_d,
+						int_mode, treeop0, treeop1,
+						op0, gen_int_mode (abs_d,
 							      int_mode),
 						NULL_RTX, 0);
 		    else
@@ -4808,8 +4816,8 @@ expand_divmod (int rem_flag, enum tree_code code, machine_mode mode,
 				      size - 1, NULL_RTX, 0);
 		t3 = force_operand (gen_rtx_MINUS (int_mode, t1, nsign),
 				    NULL_RTX);
-		t4 = expand_divmod (0, TRUNC_DIV_EXPR, int_mode, t3, op1,
-				    NULL_RTX, 0);
+		t4 = expand_divmod (0, TRUNC_DIV_EXPR, int_mode, treeop0,
+				    treeop1, t3, op1, NULL_RTX, 0);
 		if (t4)
 		  {
 		    rtx t5;
diff --git a/gcc/expr.cc b/gcc/expr.cc
index 80bb1b8a4c5b8350fb1b8f57a99fd52e5882fcb6..b786f1d75e25f3410c0640cd96a8abc055fa34d9 100644
--- a/gcc/expr.cc
+++ b/gcc/expr.cc
@@ -8028,16 +8028,17 @@ force_operand (rtx value, rtx target)
 	    return expand_divmod (0,
 				  FLOAT_MODE_P (GET_MODE (value))
 				  ? RDIV_EXPR : TRUNC_DIV_EXPR,
-				  GET_MODE (value), op1, op2, target, 0);
+				  GET_MODE (value), NULL, NULL, op1, op2,
+				  target, 0);
 	case MOD:
-	  return expand_divmod (1, TRUNC_MOD_EXPR, GET_MODE (value), op1, op2,
-				target, 0);
+	  return expand_divmod (1, TRUNC_MOD_EXPR, GET_MODE (value), NULL, NULL,
+				op1, op2, target, 0);
 	case UDIV:
-	  return expand_divmod (0, TRUNC_DIV_EXPR, GET_MODE (value), op1, op2,
-				target, 1);
+	  return expand_divmod (0, TRUNC_DIV_EXPR, GET_MODE (value), NULL, NULL,
+				op1, op2, target, 1);
 	case UMOD:
-	  return expand_divmod (1, TRUNC_MOD_EXPR, GET_MODE (value), op1, op2,
-				target, 1);
+	  return expand_divmod (1, TRUNC_MOD_EXPR, GET_MODE (value), NULL, NULL,
+				op1, op2, target, 1);
 	case ASHIFTRT:
 	  return expand_simple_binop (GET_MODE (value), code, op1, op2,
 				      target, 0, OPTAB_LIB_WIDEN);
@@ -8990,11 +8991,13 @@ expand_expr_divmod (tree_code code, machine_mode mode, tree treeop0,
       bool speed_p = optimize_insn_for_speed_p ();
       do_pending_stack_adjust ();
       start_sequence ();
-      rtx uns_ret = expand_divmod (mod_p, code, mode, op0, op1, target, 1);
+      rtx uns_ret = expand_divmod (mod_p, code, mode, treeop0, treeop1,
+				   op0, op1, target, 1);
       rtx_insn *uns_insns = get_insns ();
       end_sequence ();
       start_sequence ();
-      rtx sgn_ret = expand_divmod (mod_p, code, mode, op0, op1, target, 0);
+      rtx sgn_ret = expand_divmod (mod_p, code, mode, treeop0, treeop1,
+				   op0, op1, target, 0);
       rtx_insn *sgn_insns = get_insns ();
       end_sequence ();
       unsigned uns_cost = seq_cost (uns_insns, speed_p);
@@ -9016,7 +9019,8 @@ expand_expr_divmod (tree_code code, machine_mode mode, tree treeop0,
       emit_insn (sgn_insns);
       return sgn_ret;
     }
-  return expand_divmod (mod_p, code, mode, op0, op1, target, unsignedp);
+  return expand_divmod (mod_p, code, mode, treeop0, treeop1,
+			op0, op1, target, unsignedp);
 }
 
 rtx
diff --git a/gcc/optabs.cc b/gcc/optabs.cc
index 165f8d1fa22432b96967c69a58dbb7b4bf18120d..cff37ccb0dfc3dd79b97d0abfd872f340855dc96 100644
--- a/gcc/optabs.cc
+++ b/gcc/optabs.cc
@@ -1104,8 +1104,9 @@ expand_doubleword_mod (machine_mode mode, rtx op0, rtx op1, bool unsignedp)
 		return NULL_RTX;
 	    }
 	}
-      rtx remainder = expand_divmod (1, TRUNC_MOD_EXPR, word_mode, sum,
-				     gen_int_mode (INTVAL (op1), word_mode),
+      rtx remainder = expand_divmod (1, TRUNC_MOD_EXPR, word_mode, NULL, NULL,
+				     sum, gen_int_mode (INTVAL (op1),
+							word_mode),
 				     NULL_RTX, 1, OPTAB_DIRECT);
       if (remainder == NULL_RTX)
 	return NULL_RTX;
@@ -1208,8 +1209,8 @@ expand_doubleword_divmod (machine_mode mode, rtx op0, rtx op1, rtx *rem,
 
   if (op11 != const1_rtx)
     {
-      rtx rem2 = expand_divmod (1, TRUNC_MOD_EXPR, mode, quot1, op11,
-				NULL_RTX, unsignedp, OPTAB_DIRECT);
+      rtx rem2 = expand_divmod (1, TRUNC_MOD_EXPR, mode, NULL, NULL, quot1,
+				op11, NULL_RTX, unsignedp, OPTAB_DIRECT);
       if (rem2 == NULL_RTX)
 	return NULL_RTX;
 
@@ -1223,8 +1224,8 @@ expand_doubleword_divmod (machine_mode mode, rtx op0, rtx op1, rtx *rem,
       if (rem2 == NULL_RTX)
 	return NULL_RTX;
 
-      rtx quot2 = expand_divmod (0, TRUNC_DIV_EXPR, mode, quot1, op11,
-				 NULL_RTX, unsignedp, OPTAB_DIRECT);
+      rtx quot2 = expand_divmod (0, TRUNC_DIV_EXPR, mode, NULL, NULL, quot1,
+				 op11, NULL_RTX, unsignedp, OPTAB_DIRECT);
       if (quot2 == NULL_RTX)
 	return NULL_RTX;
 
diff --git a/gcc/target.def b/gcc/target.def
index 2a7fa68f83dd15dcdd2c332e8431e6142ec7d305..92ebd2af18fe8abb6ed95b07081cdd70113db9b1 100644
--- a/gcc/target.def
+++ b/gcc/target.def
@@ -1902,6 +1902,25 @@ implementation approaches itself.",
 	const vec_perm_indices &sel),
  NULL)
 
+DEFHOOK
+(can_special_div_by_const,
+ "This hook is used to test whether the target has a special method of\n\
+division of vectors of type @var{vectype} using the two operands @code{treeop0},\n\
+and @code{treeop1} and producing a vector of type @var{vectype}.  The division\n\
+will then not be decomposed by the and kept as a div.\n\
+\n\
+When the hook is being used to test whether the target supports a special\n\
+divide, @var{in0}, @var{in1}, and @var{output} are all null.  When the hook\n\
+is being used to emit a division, @var{in0} and @var{in1} are the source\n\
+vectors of type @var{vecttype} and @var{output} is the destination vector of\n\
+type @var{vectype}.\n\
+\n\
+Return true if the operation is possible, emitting instructions for it\n\
+if rtxes are provided and updating @var{output}.",
+ bool, (enum tree_code, tree vectype, tree treeop0, tree treeop1, rtx *output,
+	rtx in0, rtx in1),
+ default_can_special_div_by_const)
+
 /* Return true if the target supports misaligned store/load of a
    specific factor denoted in the third parameter.  The last parameter
    is true if the access is defined in a packed struct.  */
diff --git a/gcc/target.h b/gcc/target.h
index d6fa6931499d15edff3e5af3e429540d001c7058..c836036ac7fa7910d62bd3da56f39c061f68b665 100644
--- a/gcc/target.h
+++ b/gcc/target.h
@@ -51,6 +51,7 @@
 #include "insn-codes.h"
 #include "tm.h"
 #include "hard-reg-set.h"
+#include "tree-core.h"
 
 #if CHECKING_P
 
diff --git a/gcc/targhooks.h b/gcc/targhooks.h
index ecce55ebe797cedc940620e8d89816973a045d49..42451a3e22e86fee9da2f56e2640d63f936b336d 100644
--- a/gcc/targhooks.h
+++ b/gcc/targhooks.h
@@ -207,6 +207,8 @@ extern void default_addr_space_diagnose_usage (addr_space_t, location_t);
 extern rtx default_addr_space_convert (rtx, tree, tree);
 extern unsigned int default_case_values_threshold (void);
 extern bool default_have_conditional_execution (void);
+extern bool default_can_special_div_by_const (enum tree_code, tree, tree, tree,
+					      rtx *, rtx, rtx);
 
 extern bool default_libc_has_function (enum function_class, tree);
 extern bool default_libc_has_fast_function (int fcode);
diff --git a/gcc/targhooks.cc b/gcc/targhooks.cc
index b15ae19bcb60c59ae8112e67b5f06a241a9bdbf1..8206533382611a7640efba241279936ced41ee95 100644
--- a/gcc/targhooks.cc
+++ b/gcc/targhooks.cc
@@ -1807,6 +1807,14 @@ default_have_conditional_execution (void)
   return HAVE_conditional_execution;
 }
 
+/* Default that no division by constant operations are special.  */
+bool
+default_can_special_div_by_const (enum tree_code, tree, tree, tree, rtx *, rtx,
+				  rtx)
+{
+  return false;
+}
+
 /* By default we assume that c99 functions are present at the runtime,
    but sincos is not.  */
 bool
diff --git a/gcc/testsuite/gcc.dg/vect/vect-div-bitmask-1.c b/gcc/testsuite/gcc.dg/vect/vect-div-bitmask-1.c
new file mode 100644
index 0000000000000000000000000000000000000000..472cd710534bc8aa9b1b4916f3d7b4d5b64a19b9
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vect/vect-div-bitmask-1.c
@@ -0,0 +1,25 @@
+/* { dg-require-effective-target vect_int } */
+
+#include <stdint.h>
+#include "tree-vect.h"
+
+#define N 50
+#define TYPE uint8_t 
+
+__attribute__((noipa, noinline, optimize("O1")))
+void fun1(TYPE* restrict pixel, TYPE level, int n)
+{
+  for (int i = 0; i < n; i+=1)
+    pixel[i] = (pixel[i] * level) / 0xff;
+}
+
+__attribute__((noipa, noinline, optimize("O3")))
+void fun2(TYPE* restrict pixel, TYPE level, int n)
+{
+  for (int i = 0; i < n; i+=1)
+    pixel[i] = (pixel[i] * level) / 0xff;
+}
+
+#include "vect-div-bitmask.h"
+
+/* { dg-final { scan-tree-dump-not "vect_recog_divmod_pattern: detected" "vect" { target aarch64*-*-* } } } */
diff --git a/gcc/testsuite/gcc.dg/vect/vect-div-bitmask-2.c b/gcc/testsuite/gcc.dg/vect/vect-div-bitmask-2.c
new file mode 100644
index 0000000000000000000000000000000000000000..e904a71885b2e8487593a2cd3db75b3e4112e2cc
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vect/vect-div-bitmask-2.c
@@ -0,0 +1,25 @@
+/* { dg-require-effective-target vect_int } */
+
+#include <stdint.h>
+#include "tree-vect.h"
+
+#define N 50
+#define TYPE uint16_t 
+
+__attribute__((noipa, noinline, optimize("O1")))
+void fun1(TYPE* restrict pixel, TYPE level, int n)
+{
+  for (int i = 0; i < n; i+=1)
+    pixel[i] = (pixel[i] * level) / 0xffffU;
+}
+
+__attribute__((noipa, noinline, optimize("O3")))
+void fun2(TYPE* restrict pixel, TYPE level, int n)
+{
+  for (int i = 0; i < n; i+=1)
+    pixel[i] = (pixel[i] * level) / 0xffffU;
+}
+
+#include "vect-div-bitmask.h"
+
+/* { dg-final { scan-tree-dump-not "vect_recog_divmod_pattern: detected" "vect" { target aarch64*-*-* } } } */
diff --git a/gcc/testsuite/gcc.dg/vect/vect-div-bitmask-3.c b/gcc/testsuite/gcc.dg/vect/vect-div-bitmask-3.c
new file mode 100644
index 0000000000000000000000000000000000000000..a1418ebbf5ea8731ed4e3e720157701d9d1cf852
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vect/vect-div-bitmask-3.c
@@ -0,0 +1,26 @@
+/* { dg-require-effective-target vect_int } */
+/* { dg-additional-options "-fno-vect-cost-model" { target aarch64*-*-* } } */
+
+#include <stdint.h>
+#include "tree-vect.h"
+
+#define N 50
+#define TYPE uint32_t 
+
+__attribute__((noipa, noinline, optimize("O1")))
+void fun1(TYPE* restrict pixel, TYPE level, int n)
+{
+  for (int i = 0; i < n; i+=1)
+    pixel[i] = (pixel[i] * (uint64_t)level) / 0xffffffffUL;
+}
+
+__attribute__((noipa, noinline, optimize("O3")))
+void fun2(TYPE* restrict pixel, TYPE level, int n)
+{
+  for (int i = 0; i < n; i+=1)
+    pixel[i] = (pixel[i] * (uint64_t)level) / 0xffffffffUL;
+}
+
+#include "vect-div-bitmask.h"
+
+/* { dg-final { scan-tree-dump-not "vect_recog_divmod_pattern: detected" "vect" { target aarch64*-*-* } } } */
diff --git a/gcc/testsuite/gcc.dg/vect/vect-div-bitmask.h b/gcc/testsuite/gcc.dg/vect/vect-div-bitmask.h
new file mode 100644
index 0000000000000000000000000000000000000000..29a16739aa4b706616367bfd1832f28ebd07993e
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vect/vect-div-bitmask.h
@@ -0,0 +1,43 @@
+#include <stdio.h>
+
+#ifndef N
+#define N 65
+#endif
+
+#ifndef TYPE
+#define TYPE uint32_t
+#endif
+
+#ifndef DEBUG
+#define DEBUG 0
+#endif
+
+#define BASE ((TYPE) -1 < 0 ? -126 : 4)
+
+int main ()
+{
+  TYPE a[N];
+  TYPE b[N];
+
+  for (int i = 0; i < N; ++i)
+    {
+      a[i] = BASE + i * 13;
+      b[i] = BASE + i * 13;
+      if (DEBUG)
+        printf ("%d: 0x%x\n", i, a[i]);
+    }
+
+  fun1 (a, N / 2, N);
+  fun2 (b, N / 2, N);
+
+  for (int i = 0; i < N; ++i)
+    {
+      if (DEBUG)
+        printf ("%d = 0x%x == 0x%x\n", i, a[i], b[i]);
+
+      if (a[i] != b[i])
+        __builtin_abort ();
+    }
+  return 0;
+}
+
diff --git a/gcc/tree-vect-generic.cc b/gcc/tree-vect-generic.cc
index 350129555a0c71c0896c4f1003163f3b3557c11b..ebee5e24b186915ebcb3a817c9a12046b6ec94f3 100644
--- a/gcc/tree-vect-generic.cc
+++ b/gcc/tree-vect-generic.cc
@@ -1237,6 +1237,14 @@ expand_vector_operation (gimple_stmt_iterator *gsi, tree type, tree compute_type
 	  tree rhs2 = gimple_assign_rhs2 (assign);
 	  tree ret;
 
+	  /* Check if the target was going to handle it through the special
+	     division callback hook.  */
+	  if (targetm.vectorize.can_special_div_by_const (code, type, rhs1,
+							  rhs2, NULL,
+							  NULL_RTX, NULL_RTX))
+	    return NULL_TREE;
+
+
 	  if (!optimize
 	      || !VECTOR_INTEGER_TYPE_P (type)
 	      || TREE_CODE (rhs2) != VECTOR_CST
diff --git a/gcc/tree-vect-patterns.cc b/gcc/tree-vect-patterns.cc
index 09574bb1a2696b3438a4ce9f09f74b42e784aca0..607acdf95eb30335d8bc0e85af0b1bfea10fe443 100644
--- a/gcc/tree-vect-patterns.cc
+++ b/gcc/tree-vect-patterns.cc
@@ -3596,6 +3596,12 @@ vect_recog_divmod_pattern (vec_info *vinfo,
 
       return pattern_stmt;
     }
+  else if (targetm.vectorize.can_special_div_by_const (rhs_code, vectype,
+						       oprnd0, oprnd1, NULL,
+						       NULL_RTX, NULL_RTX))
+    {
+      return NULL;
+    }
 
   if (prec > HOST_BITS_PER_WIDE_INT
       || integer_zerop (oprnd1))
diff --git a/gcc/tree-vect-stmts.cc b/gcc/tree-vect-stmts.cc
index c9dab217f059f17e91e9a7582523e627d7a45b66..6d05c48a7339de094d7288bd68e0e1c1e93faafe 100644
--- a/gcc/tree-vect-stmts.cc
+++ b/gcc/tree-vect-stmts.cc
@@ -6260,6 +6260,11 @@ vectorizable_operation (vec_info *vinfo,
 	}
       target_support_p = (optab_handler (optab, vec_mode)
 			  != CODE_FOR_nothing);
+      if (!target_support_p)
+	target_support_p
+	  = targetm.vectorize.can_special_div_by_const (code, vectype,
+							op0, op1, NULL,
+							NULL_RTX, NULL_RTX);
     }
 
   bool using_emulated_vectors_p = vect_emulated_vector_p (vectype);
  

Message ID	patch-15779-tamar@arm.com
State	New, archived
Headers	Received-SPF: pass (google.com: domain of gcc-patches-bounces+ouuuleilei=gmail.com@gcc.gnu.org designates 8.43.85.97 as permitted sender) client-ip=8.43.85.97; DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 13A1C3858C52 Received-SPF: Pass (protection.outlook.com: domain of arm.com designates 63.35.35.123 as permitted sender) receiver=protection.outlook.com; client-ip=63.35.35.123; helo=64aa7808-outbound-1.mta.getcheckrecipient.com; pr=C Authentication-Results-Original: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=arm.com; Date: Fri, 23 Sep 2022 10:33:08 +0100 To: gcc-patches@gcc.gnu.org Subject: [PATCH 1/4]middle-end Support not decomposing specific divisions during vectorization. Message-ID: <patch-15779-tamar@arm.com> Content-Type: multipart/mixed; boundary="OcjMq+GKiRdRfpUn" Content-Disposition: inline MIME-Version: 1.0 NoDisclaimer: true Original-Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=arm.com; Precedence: list From: Tamar Christina via Gcc-patches <gcc-patches@gcc.gnu.org> Reply-To: Tamar Christina <tamar.christina@arm.com> Cc: nd@arm.com, rguenther@suse.de Errors-To: gcc-patches-bounces+ouuuleilei=gmail.com@gcc.gnu.org Sender: "Gcc-patches" <gcc-patches-bounces+ouuuleilei=gmail.com@gcc.gnu.org> X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?=
Series	[1/4] middle-end Support not decomposing specific divisions during vectorization. \| [1/4] middle-end Support not decomposing specific divisions during vectorization. [2/4] AArch64 Add implementation for pow2 bitmask division. [3/4] AArch64 Add SVE2 implementation for pow2 bitmask division [4/4] AArch64 sve2: rewrite pack + NARROWB + NARROWB to NARROWB + NARROWT

[1/4] middle-end Support not decomposing specific divisions during vectorization.

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