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From: "lingling.kong7 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/106113] New: wrong codegen for _mm_[u]comineq_{ss,sd}
 and need to return PF result.
Date: Tue, 28 Jun 2022 10:05:04 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106113

            Bug ID: 106113
           Summary: wrong codegen for _mm_[u]comineq_{ss,sd} and need to
                    return PF result.
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: lingling.kong7 at gmail dot com
  Target Milestone: ---

https://gcc.godbolt.org/z/svoqvKs55

for _mm_ucomineq_ss,
according to the instruction description=EF=BC=8C

Operation
(V)UCOMISS (all versions)
RESULT :=3D UnorderedCompare(DEST[31:0] <> SRC[31:0]) {
(* Set EFLAGS *) CASE (RESULT) OF
UNORDERED: ZF,PF,CF :=3D 111;
GREATER_THAN: ZF,PF,CF :=3D 000;
LESS_THAN: ZF,PF,CF :=3D 001;
EQUAL: ZF,PF,CF :=3D 100;
ESAC;
OF, AF, SF :=3D 0; }

result need to set PF =3D 1,=20

but now generate code for `_mm_ucomineq_ss` is
# gcc -O3 -mavx512f
        xorl    %eax, %eax
        vucomiss        %xmm1, %xmm0
        setne   %al
        ret
it ignore PF result, the codegen in llvm for this is correct.

We also could refer to the codegen in gcc for '_mm_comi_round_ss(__A, __B, =
4,
_MM_FROUND_NO_EXC); '=