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Properly expand extract-element for non-power-of-2 codegen

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46486 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nate Begeman 2008-01-29 02:24:00 +00:00
parent ba2a0b960e
commit 55030dc460
1 changed files with 3 additions and 2 deletions
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5
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -4405,14 +4405,15 @@ SDOperand SelectionDAGLegalize::ExpandEXTRACT_VECTOR_ELT(SDOperand Op) {
// This must be an access of the only element. Return it.
Op = ScalarizeVectorOp(Vec);
} else if (!TLI.isTypeLegal(TVT) && isa<ConstantSDNode>(Idx)) {
unsigned NumLoElts = 1 << Log2_32(NumElems-1);
ConstantSDNode *CIdx = cast<ConstantSDNode>(Idx);
SDOperand Lo, Hi;
SplitVectorOp(Vec, Lo, Hi);
if (CIdx->getValue() < NumElems/2) {
if (CIdx->getValue() < NumLoElts) {
Vec = Lo;
} else {
Vec = Hi;
Idx = DAG.getConstant(CIdx->getValue() - NumElems/2,
Idx = DAG.getConstant(CIdx->getValue() - NumLoElts,
Idx.getValueType());
}