Implement xform: (X != 0) -> (bool)X

llvm-svn: 6506
2003-06-01 03:35:25 +00:00 · 2003-06-01 03:35:25 +00:00 · 791ac1a4c8
parent ef33748248
commit 791ac1a4c8
1 changed files with 3 additions and 0 deletions
--- a/llvm/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/llvm/lib/Transforms/Scalar/InstructionCombining.cpp
@ -682,6 +682,9 @@ Instruction *InstCombiner::visitSetCondInst(BinaryOperator &I) {
  // integers at the end of their ranges...
  //
  if (ConstantInt *CI = dyn_cast<ConstantInt>(Op1)) {
+    if (CI->isNullValue() && I.getOpcode() == Instruction::SetNE)
+      return new CastInst(Op0, Type::BoolTy, I.getName());
+
    // Check to see if we are comparing against the minimum or maximum value...
    if (CI->isMinValue()) {
      if (I.getOpcode() == Instruction::SetLT)       // A < MIN -> FALSE