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tidy up some stuff duncan pointed out. 

llvm-svn: 93007
This commit is contained in:
Chris Lattner 2010-01-08 17:48:19 +00:00
parent ab6e6819b2
commit 8c92b57df9
1 changed files with 3 additions and 2 deletions
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5
llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
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@ -705,7 +705,7 @@ Instruction *InstCombiner::FoldICmpAddOpCst(ICmpInst &ICI,
// so the values can never be equal. Similiarly for all other "or equals"
// operators.
// (X+1) <u X --> X >u (MAXUINT-1) --> X != 255
// (X+1) <u X --> X >u (MAXUINT-1) --> X == 255
// (X+2) <u X --> X >u (MAXUINT-2) --> X > 253
// (X+MAXUINT) <u X --> X >u (MAXUINT-MAXUINT) --> X != 0
if (Pred == ICmpInst::ICMP_ULT || Pred == ICmpInst::ICMP_ULE) {
@ -713,7 +713,8 @@ Instruction *InstCombiner::FoldICmpAddOpCst(ICmpInst &ICI,
if (isNUW)
return ReplaceInstUsesWith(ICI, ConstantInt::getFalse(X->getContext()));
Value *R = ConstantExpr::getSub(ConstantInt::get(CI->getType(), -1ULL), CI);
Value *R =
ConstantExpr::getSub(ConstantInt::getAllOnesValue(CI->getType()), CI);
return new ICmpInst(ICmpInst::ICMP_UGT, X, R);
}