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[CodeGen] Remove calls to getVectorNumElements in DAGTypeLegalizer::SplitVecOp_EXTRACT_SUBVECTOR

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In DAGTypeLegalizer::SplitVecOp_EXTRACT_SUBVECTOR I have replaced
calls to getVectorNumElements with getVectorMinNumElements, since
this code path works for both fixed and scalable vector types. For
scalable vectors the index will be multiplied by VSCALE.

Fixes warnings in this test:

  sve-sext-zext.ll

Differential revision: https://reviews.llvm.org/D83198

(cherry picked from commit 5d84eafc6b86a42e261af8d753c3a823e0e7c67e)
This commit is contained in:
David Sherwood 2020-07-03 13:41:34 +01:00 committed by Hans Wennborg
parent df55a6ed72
commit ebd7adf1d6
1 changed files with 8 additions and 2 deletions
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10
lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
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@ -2197,13 +2197,19 @@ SDValue DAGTypeLegalizer::SplitVecOp_EXTRACT_SUBVECTOR(SDNode *N) {
SDValue Idx = N->getOperand(1);
SDLoc dl(N);
SDValue Lo, Hi;
if (SubVT.isScalableVector() !=
N->getOperand(0).getValueType().isScalableVector())
report_fatal_error("Extracting a fixed-length vector from an illegal "
"scalable vector is not yet supported");
GetSplitVector(N->getOperand(0), Lo, Hi);
uint64_t LoElts = Lo.getValueType().getVectorNumElements();
uint64_t LoElts = Lo.getValueType().getVectorMinNumElements();
uint64_t IdxVal = cast<ConstantSDNode>(Idx)->getZExtValue();
if (IdxVal < LoElts) {
assert(IdxVal + SubVT.getVectorNumElements() <= LoElts &&
assert(IdxVal + SubVT.getVectorMinNumElements() <= LoElts &&
"Extracted subvector crosses vector split!");
return DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, SubVT, Lo, Idx);
} else {