[llvm-bugs] [Bug 44934] New: frame pointer should be omitted for -pg -mfentry

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=44934

            Bug ID: 44934
           Summary: frame pointer should be omitted for -pg -mfentry
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedbugs at nondot.org
          Reporter: ndesaulniers at google.com
                CC: isanbard at gmail.com, llozano at chromium.org,
                    llvm-bugs at lists.llvm.org, srhines at google.com

// foo.c
void foo(void){}

$ gcc foo.c -O2 -pg -mfentry

foo:
1:      call        __fentry__
        ret

$ clang foo.c -O2 -pg -mfentry

foo:                                    # @foo
# %bb.0:
        call    __fentry__
        push    rbp
        mov     rbp, rsp
        pop     rbp
        ret

Maybe a bug related to `-pg`, because if I explicitly add
`-fomit-frame-pointer` I get an error that its incompatible with `-pg`.

https://reviews.llvm.org/D28000 seems to insert the __fentry__ call, but
doesn't make any changes during prologue/epilogue insertion.

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