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From: "tkoenig at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/34678] Optimization generates incorrect code with
 -frounding-math option (#pragma STDC FENV_ACCESS not implemented)
Date: Sat, 07 Jan 2023 11:14:47 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D34678

--- Comment #48 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Clang gets this right, even without the pragma; the original test case is
compiled to

        pushq   %r14
        pushq   %rbx
        subq    $24, %rsp
        movq    %rsi, %r14
        movq    %rdi, %rbx
        movsd   %xmm1, 16(%rsp)                 # 8-byte Spill
        movsd   %xmm0, 8(%rsp)                  # 8-byte Spill
        movl    $1024, %edi                     # imm =3D 0x400
        callq   fesetround@PLT
        movsd   8(%rsp), %xmm0                  # 8-byte Reload
        divsd   16(%rsp), %xmm0                 # 8-byte Folded Reload
        movsd   %xmm0, (%rbx)
        movl    $2048, %edi                     # imm =3D 0x800
        callq   fesetround@PLT
        movsd   8(%rsp), %xmm0                  # 8-byte Reload
        divsd   16(%rsp), %xmm0                 # 8-byte Folded Reload
        movsd   %xmm0, (%r14)
        addq    $24, %rsp
        popq    %rbx
        popq    %r14
        retq=