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Add target hook to prevent folding some bitcasted loads.

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This is to avoid this transformation in some cases:
fold (conv (load x)) -> (load (conv*)x)

On architectures that don't natively support some vector
loads efficiently casting the load to a smaller vector of
larger types and loading is more efficient.

Patch by Micah Villmow.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194783 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault
2013-11-15 04:42:23 +00:00
parent a0846f4143
commit 509a492442
5 changed files with 68 additions and 1 deletions
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3
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@@ -5768,7 +5768,8 @@ SDValue DAGCombiner::visitBITCAST(SDNode *N) {
if (ISD::isNormalLoad(N0.getNode()) && N0.hasOneUse() &&
// Do not change the width of a volatile load.
!cast<LoadSDNode>(N0)->isVolatile() &&
(!LegalOperations || TLI.isOperationLegal(ISD::LOAD, VT))) {
(!LegalOperations || TLI.isOperationLegal(ISD::LOAD, VT)) &&
TLI.isLoadBitCastBeneficial(N0.getValueType(), VT)) {
LoadSDNode *LN0 = cast<LoadSDNode>(N0);
unsigned Align = TLI.getDataLayout()->
getABITypeAlignment(VT.getTypeForEVT(*DAG.getContext()));