Hi, For constant C: If '(c & 0xFFFFFFFF0000FFFFULL) == 0xFFFFFFFF00000000' or say: 32(1) || 1(0) || 15(x) || 16(0), we could use "lis; xoris" to build.
Here N(M) means N continuous bit M, x for M means it is ok for either 1 or 0; '||' means concatenation. This patch update rs6000_emit_set_long_const to support those constants. Compare with previous version: https://gcc.gnu.org/pipermail/gcc-patches/2022-December/607618.htm This patch fix conflicts with trunk. Bootstrap and regtest pass on ppc64{,le}. Is this ok for trunk? BR, Jeff (Jiufu) PR target/106708 gcc/ChangeLog: * config/rs6000/rs6000.cc (rs6000_emit_set_long_const): Add to build constants through "lis; xoris". gcc/testsuite/ChangeLog: * gcc.target/powerpc/pr106708.c: Add test function. --- gcc/config/rs6000/rs6000.cc | 7 +++++++ gcc/testsuite/gcc.target/powerpc/pr106708.c | 10 +++++++++- 2 files changed, 16 insertions(+), 1 deletion(-) diff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc index 8c1192a10c8..1138d5e8cd4 100644 --- a/gcc/config/rs6000/rs6000.cc +++ b/gcc/config/rs6000/rs6000.cc @@ -10251,6 +10251,13 @@ rs6000_emit_set_long_const (rtx dest, HOST_WIDE_INT c) if (ud1 != 0) emit_move_insn (dest, gen_rtx_IOR (DImode, temp, GEN_INT (ud1))); } + else if (ud4 == 0xffff && ud3 == 0xffff && !(ud2 & 0x8000) && ud1 == 0) + { + /* lis; xoris */ + temp = !can_create_pseudo_p () ? dest : gen_reg_rtx (DImode); + emit_move_insn (temp, GEN_INT (sext_hwi ((ud2 | 0x8000) << 16, 32))); + emit_move_insn (dest, gen_rtx_XOR (DImode, temp, GEN_INT (0x80000000))); + } else if (ud4 == 0xffff && ud3 == 0xffff && (ud1 & 0x8000)) { /* li; xoris */ diff --git a/gcc/testsuite/gcc.target/powerpc/pr106708.c b/gcc/testsuite/gcc.target/powerpc/pr106708.c index dc9ceda8367..a015c71e630 100644 --- a/gcc/testsuite/gcc.target/powerpc/pr106708.c +++ b/gcc/testsuite/gcc.target/powerpc/pr106708.c @@ -4,7 +4,7 @@ /* { dg-require-effective-target has_arch_ppc64 } */ long long arr[] - = {0xffffffff7cdeab55LL, 0x98765432LL, 0xabcd0000LL}; += {0xffffffff7cdeab55LL, 0x98765432LL, 0xabcd0000LL, 0xffffffff65430000LL}; void __attribute__ ((__noipa__)) lixoris (long long *arg) { @@ -27,6 +27,13 @@ void __attribute__ ((__noipa__)) lisrldicl (long long *arg) /* { dg-final { scan-assembler-times {\mlis .*,0xabcd\M} 1 } } */ /* { dg-final { scan-assembler-times {\mrldicl .*,0,32\M} 1 } } */ +void __attribute__ ((__noipa__)) lisxoris (long long *arg) +{ + *arg = 0xffffffff65430000LL; +} +/* { dg-final { scan-assembler-times {\mlis .*,0xe543\M} 1 } } */ +/* { dg-final { scan-assembler-times {\mxoris .*0x8000\M} 1 } } */ + int main () { @@ -35,6 +42,7 @@ main () lixoris (a); lioris (a + 1); lisrldicl (a + 2); + lisxoris (a + 3); if (__builtin_memcmp (a, arr, sizeof (arr)) != 0) __builtin_abort (); return 0; -- 2.17.1
