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. 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: New test. --- gcc/config/rs6000/rs6000.cc | 7 +++++++ gcc/testsuite/gcc.target/powerpc/pr106708.c | 23 +++++++++++++++++++++ 2 files changed, 30 insertions(+) create mode 100644 gcc/testsuite/gcc.target/powerpc/pr106708.c diff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc index 1a51b79ebfe..7efed94a0bc 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 (ud3 == 0 && ud4 == 0) { temp = !can_create_pseudo_p () ? dest : gen_reg_rtx (DImode); diff --git a/gcc/testsuite/gcc.target/powerpc/pr106708.c b/gcc/testsuite/gcc.target/powerpc/pr106708.c new file mode 100644 index 00000000000..dd0386c109c --- /dev/null +++ b/gcc/testsuite/gcc.target/powerpc/pr106708.c @@ -0,0 +1,23 @@ +/* PR target/106708 */ +/* { dg-do run } */ +/* { dg-options "-O2 -mno-prefixed -save-temps" } */ +/* { dg-require-effective-target has_arch_ppc64 } */ + +long long arr[] = {0xffffffff65430000LL}; +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 () +{ + long long a[sizeof (arr) / sizeof (arr[0])]; + + lisxoris (a); + if (__builtin_memcmp (a, arr, sizeof (arr)) != 0) + __builtin_abort (); + return 0; +} -- 2.17.1