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Bug 19348: Check for legal ExtLoad operation before folding

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(aext (zextload x)) -> (aext (truncate (*extload x)))

Patch by Stanislav Mekhanoshin!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205805 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault 2014-04-08 21:40:37 +00:00
parent a83f78786e
commit 1507319299
1 changed files with 12 additions and 9 deletions
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21
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -5507,16 +5507,19 @@ SDValue DAGCombiner::visitANY_EXTEND(SDNode *N) {
!ISD::isNON_EXTLoad(N0.getNode()) && ISD::isUNINDEXEDLoad(N0.getNode()) &&
N0.hasOneUse()) {
LoadSDNode *LN0 = cast<LoadSDNode>(N0);
ISD::LoadExtType ExtType = LN0->getExtensionType();
EVT MemVT = LN0->getMemoryVT();
SDValue ExtLoad = DAG.getExtLoad(LN0->getExtensionType(), SDLoc(N),
VT, LN0->getChain(), LN0->getBasePtr(),
MemVT, LN0->getMemOperand());
CombineTo(N, ExtLoad);
CombineTo(N0.getNode(),
DAG.getNode(ISD::TRUNCATE, SDLoc(N0),
N0.getValueType(), ExtLoad),
ExtLoad.getValue(1));
return SDValue(N, 0); // Return N so it doesn't get rechecked!
if (!LegalOperations || TLI.isLoadExtLegal(ExtType, MemVT)) {
SDValue ExtLoad = DAG.getExtLoad(ExtType, SDLoc(N),
VT, LN0->getChain(), LN0->getBasePtr(),
MemVT, LN0->getMemOperand());
CombineTo(N, ExtLoad);
CombineTo(N0.getNode(),
DAG.getNode(ISD::TRUNCATE, SDLoc(N0),
N0.getValueType(), ExtLoad),
ExtLoad.getValue(1));
return SDValue(N, 0); // Return N so it doesn't get rechecked!
}
}
if (N0.getOpcode() == ISD::SETCC) {