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This reduces the number of 3/4-instruction immediates in SPECCPU2017 by ~2%. Passes regress, OK for commit? gcc/ChangeLog: * config/aarch64/aarch64.cc (aarch64_internal_mov_immediate) Add support for immediates using MOV/EOR bitmask. gcc/testsuite: * gcc.target/aarch64/imm_choice_comparison.c: Fix test. * gcc.target/aarch64/moveor_imm.c: Add new test. * gcc.target/aarch64/pr106583.c: Fix test. diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc index 578a253d6e0e133e19592553fc873b3e73f9f218..ed5be2b64c9a767d74e9d78415da964c669001aa 100644 --- a/gcc/config/aarch64/aarch64.cc +++ b/gcc/config/aarch64/aarch64.cc @@ -5748,6 +5748,26 @@ aarch64_internal_mov_immediate (rtx dest, rtx imm, bool generate, } return 2; } + + /* Try 2 bitmask immediates which are xor'd together. */ + for (i = 0; i < 64; i += 16) + { + val2 = (val >> i) & mask; + val2 |= val2 << 16; + val2 |= val2 << 32; + if (aarch64_bitmask_imm (val2) && aarch64_bitmask_imm (val ^ val2)) + break; + } + + if (i != 64) + { + if (generate) + { + emit_insn (gen_rtx_SET (dest, GEN_INT (val2))); + emit_insn (gen_xordi3 (dest, dest, GEN_INT (val ^ val2))); + } + return 2; + } } /* Try a bitmask plus 2 movk to generate the immediate in 3 instructions. */ diff --git a/gcc/testsuite/gcc.target/aarch64/imm_choice_comparison.c b/gcc/testsuite/gcc.target/aarch64/imm_choice_comparison.c index ebc44d6dbc7287d907603d77d7b54496de177c4b..2434ca380ca2cad3e1e4181deeaad680f518b866 100644 --- a/gcc/testsuite/gcc.target/aarch64/imm_choice_comparison.c +++ b/gcc/testsuite/gcc.target/aarch64/imm_choice_comparison.c @@ -6,7 +6,7 @@ int foo (long long x) { - return x <= 0x1999999999999998; + return x <= 0x0000999999999998; } int diff --git a/gcc/testsuite/gcc.target/aarch64/moveor_imm.c b/gcc/testsuite/gcc.target/aarch64/moveor_imm.c new file mode 100644 index 0000000000000000000000000000000000000000..5f4997b50398fdda5924610959e0c54967ad0735 --- /dev/null +++ b/gcc/testsuite/gcc.target/aarch64/moveor_imm.c @@ -0,0 +1,31 @@ +/* { dg-do assemble } */ +/* { dg-options "-O2 --save-temps" } */ + +long f1 (void) +{ + return 0x2aaaaaaaaaaaaaab; +} + +long f2 (void) +{ + return 0x10f0f0f0f0f0f0f1; +} + +long f3 (void) +{ + return 0xccccccccccccccd; +} + +long f4 (void) +{ + return 0x1999999999999998; +} + +long f5 (void) +{ + return 0x3f3333333f333333; +} + +/* { dg-final { scan-assembler-not {\tmovk\t} } } */ +/* { dg-final { scan-assembler-times {\tmov\t} 5 } } */ +/* { dg-final { scan-assembler-times {\teor\t} 5 } } */ diff --git a/gcc/testsuite/gcc.target/aarch64/pr106583.c b/gcc/testsuite/gcc.target/aarch64/pr106583.c index 0f931580817d78dc1cc58f03b251bd21bec71f59..79ada5160ce059d66eeaee407ca02488b2a1f114 100644 --- a/gcc/testsuite/gcc.target/aarch64/pr106583.c +++ b/gcc/testsuite/gcc.target/aarch64/pr106583.c @@ -3,7 +3,7 @@ long f1 (void) { - return 0x7efefefefefefeff; + return 0x75fefefefefefeff; } long f2 (void)