[LLVMbugs] [Bug 621] NEW: llc -march=x86 output seems broken

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=621

           Summary: llc -march=x86 output seems broken
           Product: tools
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: critical
          Priority: P2
         Component: llc
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: eric at vanrietpaap.nl


;generate .s file with:
;
;incorrect: llvm-as < simple5.ll | opt -simplifycfg | llc -march=x86
;correct  : llvm-as < simple5.ll | opt -simplifycfg | llc -march=c
;correct  : llvm-as < simple5.ll | opt              | llc -march=x86
;correct  : llvm-as < simple5.ll | opt -simplifycfg | llvm-dis
;
;Therefor my guess is that it's a bug in the llc x86 code generator and not in opt.
;
;incorrect output (.s file) is:
;
;.text
;.align  16
;.globl  pypy_simple5
;.type   pypy_simple5, @function
;pypy_simple5:
;    movl $13, %ecx
;    movl $12, %eax
;    movb 4(%esp), %al
;    testb %al, %al
;    cmove %ecx, %eax
;    ret
;.size pypy_simple5, .-pypy_simple5
;
;Which is incorrect because %eax gets modified by movb 4(%esp), %al

fastcc int %pypy_simple5(bool %b_4787) {
    block0:
        br bool %b_4787, label %block2, label %block1

    block1:
        %v4788 = phi int [13, %block0], [12, %block2]
        ret int %v4788

    block2:
        br label %block1
}



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