[LLVMbugs] [Bug 2169] New: anders-aa wrong result with memcpy

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Fri Mar 21 13:43:32 PDT 2008


           Summary: anders-aa wrong result with memcpy
           Product: new-bugs
           Version: unspecified
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: baldrick at free.fr
                CC: llvmbugs at cs.uiuc.edu

For the following testcase,
  opt -anders-aa -gvn
results in %tmp being replaced with undef:

declare void @llvm.memcpy.i32(i8*, i8*, i32, i32) nounwind
declare void @use(i8)

define void @f(i8* %x) {
        %copy = alloca i8               ; <i8*> [#uses=6]
        call void @llvm.memcpy.i32( i8* %copy, i8* %x, i32 1, i32 4 )
        %tmp = load i8* %copy           ; <i8> [#uses=1]
        call void @use(i8 %tmp)
        ret void

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