[LLVMbugs] [Bug 940] NEW: X86 load folding bug

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=940

           Summary: X86 load folding bug
           Product: libraries
           Version: 1.8
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Backend: X86
        AssignedTo: evan.cheng at apple.com
        ReportedBy: sabre at nondot.org


This testcase causes the X86 backend to select a legal dag into an illegal input to the scheduler.  It's a 
"load folding + flag" issue.

This breaks QT.

-Chris

void %_ZN13QFSFileEngine4readEPcx() {
        %tmp201 = load int* null                ; <int> [#uses=1]
        %tmp201 = cast int %tmp201 to long              ; <long> [#uses=1]
        %tmp202 = load long* null               ; <long> [#uses=1]
        %tmp203 = add long %tmp201, %tmp202             ; <long> [#uses=1]
        store long %tmp203, long* null
        ret void
}



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