[LLVMbugs] [Bug 8361] New: duplicated compare instruction

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Tue Oct 12 06:22:36 PDT 2010


           Summary: duplicated compare instruction
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: Edmund.Grimley-Evans at arm.com
                CC: llvmbugs at cs.uiuc.edu

Keywords: duplicate duplicated redundant repeated compare comparison cmp

The compare instruction is repeated unnecessarily in the code generated from

const char *f(int x, int y)
  return x < y ? "<" : x == y ? "=" : ">";

I've seen this with the ARM and x86 back ends.

Currently on r116298.

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