[LLVMbugs] [Bug 1933] New: Invalid remainder instcombine

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Sat Jan 19 21:31:24 PST 2008


           Summary: Invalid remainder 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) {
%s = mul i32 %a, 3
%c = urem i32 %s, 3
ret i32 %c

using opt -std-compile-opts folds to

define i32 @fold(i32 %a) nounwind  {
        ret i32 0

This is wrong!  For example, try @fold(i32 2863311531).

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