[Bug rtl-optimization/107063] New: [X86_64 codegen] Using inc eax instead of inc dword ptr

[hiraditya at msn dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107063

            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 = 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   


https://godbolt.org/z/vzq4jr5vj