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When folding a bitcast into a load or store, preserve the alignment

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information of the original load or store, which is checked to be
at least as good, and possibly better.

llvm-svn: 52849
This commit is contained in:
Dan Gohman 2008-06-28 00:45:22 +00:00
parent 12944690d5
commit 6b87f869e4
1 changed files with 2 additions and 2 deletions
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4
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -3445,7 +3445,7 @@ SDOperand DAGCombiner::visitBIT_CONVERT(SDNode *N) {
if (Align <= OrigAlign) {
SDOperand Load = DAG.getLoad(VT, LN0->getChain(), LN0->getBasePtr(),
LN0->getSrcValue(), LN0->getSrcValueOffset(),
LN0->isVolatile(), Align);
LN0->isVolatile(), OrigAlign);
AddToWorkList(N);
CombineTo(N0.Val, DAG.getNode(ISD::BIT_CONVERT, N0.getValueType(), Load),
Load.getValue(1));
@ -4547,7 +4547,7 @@ SDOperand DAGCombiner::visitSTORE(SDNode *N) {
((!AfterLegalize && !ST->isVolatile()) ||
TLI.isOperationLegal(ISD::STORE, SVT)))
return DAG.getStore(Chain, Value.getOperand(0), Ptr, ST->getSrcValue(),
ST->getSrcValueOffset(), ST->isVolatile(), Align);
ST->getSrcValueOffset(), ST->isVolatile(), OrigAlign);
}
// Turn 'store float 1.0, Ptr' -> 'store int 0x12345678, Ptr'