[LLVMbugs] [Bug 1931] New: Invalid division instcombine

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=1931

           Summary: Invalid division instcombine
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: sharparrow1 at yahoo.com
                CC: llvmbugs at cs.uiuc.edu


define i32 @fold(i32 %a) {
%b = sdiv i32 %a, -1
%c = sdiv i32 %b, -2
ret i32 %c
}

gets combined into

define i32 @fold(i32 %a) nounwind  {
        %c = sdiv i32 %a, 2             ; <i32> [#uses=1]
        ret i32 %c
}

by opt -std-compile-opts.  These functions are not equivalent!


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