[LLVMbugs] [Bug 9807] New: over relaxation of cmp instructions

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9807

           Summary: over relaxation of cmp instructions
           Product: libraries
           Version: trunk
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: Support Libraries
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: daniel at zuster.org
                CC: llvmbugs at cs.uiuc.edu


MC is over relaxing the cmpl instruction in the following example:
--
ddunbar at lordcrumb:tmp$ cat x.s
    .section    __DATA,__data
_g0:
        .long 0

    .section    __TEXT,__text,regular,pure_instructions
_f0:
L0:
    cmpl    $102, _g0 - L0(%eax)

ddunbar at lordcrumb:tmp$ gcc -m32 -c x.s && otool -tv x.o
x.o:
(__TEXT,__text) section
_f0:
00000000    cmpl    $0x66,0x00000007(%eax)

ddunbar at lordcrumb:tmp$ clang -m32 -c x.s && otool -tv x.o
x.o:
(__TEXT,__text) section
_f0:
00000000    cmpl    $0x00000066,0x0000000a(%eax)
ddunbar at lordcrumb:tmp$ 
--

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