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[SVE] Fix casts to <FixedVectorType> in truncateToMinimalBitwidths

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Fixes more casts to `<FixedVectorType>` for the cases where the
instruction is a Insert/ExtractElementInst.

For fixed-width, this part of truncateToMinimalBitWidths is tested by
AArch64/type-shrinkage-insertelt.ll. I attempted to write a test case for this part
of truncateToMinimalBitWidths which uses scalable vectors, but was unable to add
one. The tests in type-shrinkage-insertelt.ll rely on scalarization to create extract
element instructions for instance, which is not possible for scalable vectors.

Reviewed By: david-arm

Differential Revision: https://reviews.llvm.org/D106163
This commit is contained in:
Kerry McLaughlin 2021-07-26 10:55:15 +01:00
parent 7d6020c9b9
commit d43867c3c3
1 changed files with 6 additions and 8 deletions
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14
lib/Transforms/Vectorize/LoopVectorize.cpp
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@ -4049,19 +4049,17 @@ void InnerLoopVectorizer::truncateToMinimalBitwidths(VPTransformState &State) {
// Don't do anything with the operands, just extend the result.
continue;
} else if (auto *IE = dyn_cast<InsertElementInst>(I)) {
auto Elements = cast<FixedVectorType>(IE->getOperand(0)->getType())
->getNumElements();
auto Elements =
cast<VectorType>(IE->getOperand(0)->getType())->getElementCount();
auto *O0 = B.CreateZExtOrTrunc(
IE->getOperand(0),
FixedVectorType::get(ScalarTruncatedTy, Elements));
IE->getOperand(0), VectorType::get(ScalarTruncatedTy, Elements));
auto *O1 = B.CreateZExtOrTrunc(IE->getOperand(1), ScalarTruncatedTy);
NewI = B.CreateInsertElement(O0, O1, IE->getOperand(2));
} else if (auto *EE = dyn_cast<ExtractElementInst>(I)) {
auto Elements = cast<FixedVectorType>(EE->getOperand(0)->getType())
->getNumElements();
auto Elements =
cast<VectorType>(EE->getOperand(0)->getType())->getElementCount();
auto *O0 = B.CreateZExtOrTrunc(
EE->getOperand(0),
FixedVectorType::get(ScalarTruncatedTy, Elements));
EE->getOperand(0), VectorType::get(ScalarTruncatedTy, Elements));
NewI = B.CreateExtractElement(O0, EE->getOperand(2));
} else {
// If we don't know what to do, be conservative and don't do anything.