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[AArch64] Factor out transform code from split16BStore. NFC.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@286874 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Geoff Berry 2016-11-14 19:39:00 +00:00
parent 52fb4f34b6
commit 0763004de3
1 changed files with 31 additions and 24 deletions
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55
lib/Target/AArch64/AArch64ISelLowering.cpp
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@ -8769,6 +8769,36 @@ static SDValue performExtendCombine(SDNode *N,
return DAG.getNode(ISD::CONCAT_VECTORS, DL, ResVT, Lo, Hi);
}
static SDValue split16BStoreSplat(SelectionDAG &DAG, StoreSDNode *St,
SDValue SplatVal, unsigned NumVecElts) {
assert((NumVecElts == 4 || NumVecElts == 2) && "Unexpected NumVecElts");
unsigned OrigAlignment = St->getAlignment();
unsigned EltOffset = NumVecElts == 4 ? 4 : 8;
unsigned Alignment = std::min(OrigAlignment, EltOffset);
// Create scalar stores. This is at least as good as the code sequence for a
// split unaligned store which is a dup.s, ext.b, and two stores.
// Most of the time the three stores should be replaced by store pair
// instructions (stp).
SDLoc DL(St);
SDValue BasePtr = St->getBasePtr();
SDValue NewST1 =
DAG.getStore(St->getChain(), DL, SplatVal, BasePtr, St->getPointerInfo(),
St->getAlignment(), St->getMemOperand()->getFlags());
unsigned Offset = EltOffset;
while (--NumVecElts) {
SDValue OffsetPtr = DAG.getNode(ISD::ADD, DL, MVT::i64, BasePtr,
DAG.getConstant(Offset, DL, MVT::i64));
NewST1 = DAG.getStore(NewST1.getValue(0), DL, SplatVal, OffsetPtr,
St->getPointerInfo(), Alignment,
St->getMemOperand()->getFlags());
Offset += EltOffset;
}
return NewST1;
}
/// Replace a splat of a scalar to a vector store by scalar stores of the scalar
/// value. The load store optimizer pass will merge them to store pair stores.
/// This has better performance than a splat of the scalar followed by a split
@ -8819,30 +8849,7 @@ static SDValue replaceSplatVectorStore(SelectionDAG &DAG, StoreSDNode *St) {
if (IndexNotInserted.any())
return SDValue();
unsigned OrigAlignment = St->getAlignment();
unsigned EltOffset = NumVecElts == 4 ? 4 : 8;
unsigned Alignment = std::min(OrigAlignment, EltOffset);
// Create scalar stores. This is at least as good as the code sequence for a
// split unaligned store which is a dup.s, ext.b, and two stores.
// Most of the time the three stores should be replaced by store pair
// instructions (stp).
SDLoc DL(St);
SDValue BasePtr = St->getBasePtr();
SDValue NewST1 =
DAG.getStore(St->getChain(), DL, SplatVal, BasePtr, St->getPointerInfo(),
St->getAlignment(), St->getMemOperand()->getFlags());
unsigned Offset = EltOffset;
while (--NumVecElts) {
SDValue OffsetPtr = DAG.getNode(ISD::ADD, DL, MVT::i64, BasePtr,
DAG.getConstant(Offset, DL, MVT::i64));
NewST1 = DAG.getStore(NewST1.getValue(0), DL, SplatVal, OffsetPtr,
St->getPointerInfo(), Alignment,
St->getMemOperand()->getFlags());
Offset += EltOffset;
}
return NewST1;
return split16BStoreSplat(DAG, St, SplatVal, NumVecElts);
}
static SDValue split16BStores(SDNode *N, TargetLowering::DAGCombinerInfo &DCI,