[llvm-bugs] [Bug 42328] New: Missed canonicalization x / (- y) -> (-x) / y

via llvm-bugs llvm-bugs at lists.llvm.org
Wed Jun 19 07:44:57 PDT 2019


            Bug ID: 42328
           Summary: Missed canonicalization x / (- y) -> (-x) / y
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: david.bolvansky at gmail.com
                CC: llvm-bugs at lists.llvm.org

int div_neg (int x, int y)
  return x / (- y);

int div_negx (int x, int y)
  return  -x / y;

div_neg(int, int):  
        mov     eax, edi
        neg     esi
        idiv    esi
div_negx(int, int):
        mov     eax, edi
        idiv    esi
        neg     eax

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