[LLVMbugs] [Bug 16057] New: less efficient comparison of global addresses

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=16057

            Bug ID: 16057
           Summary: less efficient comparison of global addresses
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: rafael.espindola at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Given

extern int x;
_Bool f(int *y) {
  return &x == y;
}

gcc produces

f:
    cmpq    $x, %rdi
    sete    %al
    ret

clang produces

f:
    movl    $x, %eax
    cmpq    %rax, %rdi
    sete    %al
    ret

-- 
You are receiving this mail because:
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-bugs/attachments/20130517/ce63c016/attachment.html>