diff options
Diffstat (limited to 'gcc/config/i386/i386-expand.cc')
| -rw-r--r-- | gcc/config/i386/i386-expand.cc | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/gcc/config/i386/i386-expand.cc b/gcc/config/i386/i386-expand.cc index 7bb4d39..9a8d244 100644 --- a/gcc/config/i386/i386-expand.cc +++ b/gcc/config/i386/i386-expand.cc @@ -10234,6 +10234,18 @@ ix86_expand_sse_ptest (const struct builtin_description *d, tree exp, machine_mode mode1 = insn_data[d->icode].operand[1].mode; enum rtx_code comparison = d->comparison; + /* ptest reg, reg sets the carry flag. */ + if (comparison == LTU + && (d->code == IX86_BUILTIN_PTESTC + || d->code == IX86_BUILTIN_PTESTC256) + && rtx_equal_p (op0, op1)) + { + if (!target) + target = gen_reg_rtx (SImode); + emit_move_insn (target, const1_rtx); + return target; + } + if (VECTOR_MODE_P (mode0)) op0 = safe_vector_operand (op0, mode0); if (VECTOR_MODE_P (mode1)) |