[LLVMbugs] [Bug 945] NEW: x86 backend doesn't lower x%255 to multiply

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=945

           Summary: x86 backend doesn't lower x%255 to multiply
           Product: libraries
           Version: 1.8
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Backend: X86
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: sabre at nondot.org


Consider:

int test(int X) {
  return X%255;
}

The PPC backend lowers this to mulhw+stuff, the X86 backend should too.  It is the major reason we are 
slower at Benchmarks/Misc/ReedSolomon.c than GCC.

-Chris



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