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From: "hiraditya at msn dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/107063] New: [X86_64 codegen] Using inc eax
 instead of inc dword ptr
Date: Tue, 27 Sep 2022 23:30:07 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: rtl-optimization
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: hiraditya at msn dot com
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107063

            Bug ID: 107063
           Summary: [X86_64 codegen] Using inc eax instead of inc dword
                    ptr
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hiraditya at msn dot com
  Target Milestone: ---

int volatile gv =3D 0;

void foo() {
    ++gv;
}


$ gcc -Os

foo():
        mov     eax, DWORD PTR gv[rip]
        inc     eax
        mov     DWORD PTR gv[rip], eax
        ret
gv:
        .zero   4


$ clang -Os

foo():                                # @foo()
        inc     dword ptr [rip + gv]
        ret
gv:
        .long   0=20=20=20


https://godbolt.org/z/vzq4jr5vj=