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Loop Vectorize: optimize the vectorization of trunc(induction_var). The truncation is now done on scalars.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169904 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem
2012-12-11 18:58:10 +00:00
parent 37a9830d20
commit 5e9efa10fc
5 changed files with 46 additions and 5 deletions
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14
lib/Transforms/Vectorize/LoopVectorize.cpp
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@ -1204,8 +1204,20 @@ InnerLoopVectorizer::vectorizeBlockInLoop(LoopVectorizationLegality *Legal,
case Instruction::Trunc:
case Instruction::FPTrunc:
case Instruction::BitCast: {
/// Vectorize bitcasts.
CastInst *CI = dyn_cast<CastInst>(it);
/// Optimize the special case where the source is the induction
/// variable. Notice that we can only optimize the 'trunc' case
/// because: a. FP conversions lose precision, b. sext/zext may wrap,
/// c. other casts depend on pointer size.
if (CI->getOperand(0) == OldInduction &&
it->getOpcode() == Instruction::Trunc) {
Value *ScalarCast = Builder.CreateCast(CI->getOpcode(), Induction,
CI->getType());
Value *Broadcasted = getBroadcastInstrs(ScalarCast);
WidenMap[it] = getConsecutiveVector(Broadcasted);
break;
}
/// Vectorize casts.
Value *A = getVectorValue(it->getOperand(0));
Type *DestTy = VectorType::get(CI->getType()->getScalarType(), VF);
WidenMap[it] = Builder.CreateCast(CI->getOpcode(), A, DestTy);