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Enable the simplification of truncating-store after fixing the usage of

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GetDemandBits (which must operate on the vector element type).

Fix the a usage of getZeroExtendInReg which must also be done on scalar types.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133052 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem 2011-06-15 11:19:12 +00:00
parent 1e56a2a85f
commit baff46f192
2 changed files with 5 additions and 4 deletions
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7
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -6428,14 +6428,15 @@ SDValue DAGCombiner::visitSTORE(SDNode *N) {
// FIXME: is there such a thing as a truncating indexed store?
if (ST->isTruncatingStore() && ST->isUnindexed() &&
Value.getValueType().isInteger() && !Value.getValueType().isVector()) {
Value.getValueType().isInteger()) {
// See if we can simplify the input to this truncstore with knowledge that
// only the low bits are being used. For example:
// "truncstore (or (shl x, 8), y), i8" -> "truncstore y, i8"
SDValue Shorter =
GetDemandedBits(Value,
APInt::getLowBitsSet(Value.getValueSizeInBits(),
ST->getMemoryVT().getSizeInBits()));
APInt::getLowBitsSet(
Value.getValueType().getScalarType().getSizeInBits(),
ST->getMemoryVT().getScalarType().getSizeInBits()));
AddToWorkList(Value.getNode());
if (Shorter.getNode())
return DAG.getTruncStore(Chain, N->getDebugLoc(), Shorter,

2
lib/CodeGen/SelectionDAG/LegalizeTypes.h
View File

@ -201,7 +201,7 @@ private:
EVT OldVT = Op.getValueType();
DebugLoc dl = Op.getDebugLoc();
Op = GetPromotedInteger(Op);
return DAG.getZeroExtendInReg(Op, dl, OldVT);
return DAG.getZeroExtendInReg(Op, dl, OldVT.getScalarType());
}
// Integer Result Promotion.