http://llvm.org/bugs/show_bug.cgi?id=4945
Summary: clang: -fomit-frame-pointer must be enabled at -O1 and
higher on x86-64
Product: new-bugs
Version: 2.6
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
llvm-gcc and gcc enable -fomit-frame-pointer at -O1 and higher (including -Os)
on x86-64; clang does not.
Testcase:
$ echo 'int main(){return 0;}'|~/llvm-git/install/bin/clang -march=x86-64 -O1
-x c - -S -o -|grep rbp
pushq %rbp
movq %rsp, %rbp
popq %rbp
$ echo 'int main(){return 0;}'|~/llvm-git/install/bin/llvm-gcc -march=x86-64
-O1 -x c - -S -o -|grep rbp
Note that this is a driver issue, if I use -fomit-frame-pointer clang works
correctly too:
$ echo 'int main(){return 0;}'|~/llvm-git/install/bin/clang -march=x86-64
-fomit-frame-pointer -O1 -x c - -S -o -|grep rbp
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