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clarify logic.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86689 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-11-10 17:00:47 +00:00
parent 8781416858
commit 6b583919d9
1 changed files with 4 additions and 4 deletions
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6
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -8261,10 +8261,10 @@ Instruction *InstCombiner::commonIntCastTransforms(CastInst &CI) {
// Only do this if the dest type is a simple type, don't convert the
// expression tree to something weird like i93 unless the source is also
// strange.
if (!isa<IntegerType>(SrcI->getType()) ||
(ShouldChangeType(SrcI->getType(), DestTy, TD) &&
if ((isa<VectorType>(DestTy) ||
ShouldChangeType(SrcI->getType(), DestTy, TD)) &&
CanEvaluateInDifferentType(SrcI, DestTy,
CI.getOpcode(), NumCastsRemoved))) {
CI.getOpcode(), NumCastsRemoved)) {
// If this cast is a truncate, evaluting in a different type always
// eliminates the cast, so it is always a win. If this is a zero-extension,
// we need to do an AND to maintain the clear top-part of the computation,