[LLVMbugs] [Bug 11566] New: clang keeps frame pointers by default on linux x86_64

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=11566

             Bug #: 11566
           Summary: clang keeps frame pointers by default on linux x86_64
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Driver
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: rafael.espindola at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


given

void g(void);
void f(void) {
        g();
        g();
}

"gcc -c foo.c -Os -o foo.o" will produce

push   %rax
callq  6 <f+0x6>
pop    %rdx
jmpq   c <f+0xc>

(no idea what gcc is doing with rax/rdx).

"clang -c foo.c -Os -o foo.o" produces

push   %rbp
mov    %rsp,%rbp
callq  9 <f+0x9>
pop    %rbp
jmpq   f <f+0xf>

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