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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/103565] GCC emits more assembly than clang
 for carry flag
Date: Mon, 06 Dec 2021 21:47:08 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103565

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The difference is just argument and return register differences (and maybe a
register allocation issue).
That is the extra instructions are:
for add_carry_pattern_test:
        movzx   edi, dil
        mov     r8, rcx
        xor     ecx, ecx

for add_carry_x86_intrinsics:
        movzx   edi, dil=