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[X86] Simplify creation of saturating truncating stores.

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We just need to check if the truncating store is legal
instead of going through isSATValidOnAVX512Subtarget.

llvm-svn: 368607
This commit is contained in:
Craig Topper 2019-08-12 19:26:30 +00:00
parent 747bfa048d
commit 699ceb4cd6
1 changed files with 11 additions and 41 deletions
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52
lib/Target/X86/X86ISelLowering.cpp
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@ -39021,36 +39021,6 @@ static SDValue detectSSatPattern(SDValue In, EVT VT, bool MatchPackUS = false) {
return SDValue();
}
/// Detect a pattern of truncation with signed saturation.
/// The types should allow to use VPMOVSS* instruction on AVX512.
/// Return the source value to be truncated or SDValue() if the pattern was not
/// matched.
static SDValue detectAVX512SSatPattern(SDValue In, EVT VT,
const X86Subtarget &Subtarget,
const TargetLowering &TLI) {
if (!TLI.isTypeLegal(In.getValueType()))
return SDValue();
if (!isSATValidOnAVX512Subtarget(In.getValueType(), VT, Subtarget))
return SDValue();
return detectSSatPattern(In, VT);
}
/// Detect a pattern of truncation with saturation:
/// (truncate (umin (x, unsigned_max_of_dest_type)) to dest_type).
/// The types should allow to use VPMOVUS* instruction on AVX512.
/// Return the source value to be truncated or SDValue() if the pattern was not
/// matched.
static SDValue detectAVX512USatPattern(SDValue In, EVT VT, SelectionDAG &DAG,
const SDLoc &DL,
const X86Subtarget &Subtarget,
const TargetLowering &TLI) {
if (!TLI.isTypeLegal(In.getValueType()))
return SDValue();
if (!isSATValidOnAVX512Subtarget(In.getValueType(), VT, Subtarget))
return SDValue();
return detectUSatPattern(In, VT, DAG, DL);
}
static SDValue combineTruncateWithSat(SDValue In, EVT VT, const SDLoc &DL,
SelectionDAG &DAG,
const X86Subtarget &Subtarget) {
@ -39653,17 +39623,17 @@ static SDValue combineStore(SDNode *N, SelectionDAG &DAG,
St->getPointerInfo(), St->getAlignment(),
St->getMemOperand()->getFlags());
if (SDValue Val =
detectAVX512SSatPattern(St->getValue(), St->getMemoryVT(), Subtarget,
TLI))
return EmitTruncSStore(true /* Signed saturation */, St->getChain(),
dl, Val, St->getBasePtr(),
St->getMemoryVT(), St->getMemOperand(), DAG);
if (SDValue Val = detectAVX512USatPattern(St->getValue(), St->getMemoryVT(),
DAG, dl, Subtarget, TLI))
return EmitTruncSStore(false /* Unsigned saturation */, St->getChain(),
dl, Val, St->getBasePtr(),
St->getMemoryVT(), St->getMemOperand(), DAG);
if (TLI.isTruncStoreLegal(VT, StVT)) {
if (SDValue Val = detectSSatPattern(St->getValue(), St->getMemoryVT()))
return EmitTruncSStore(true /* Signed saturation */, St->getChain(),
dl, Val, St->getBasePtr(),
St->getMemoryVT(), St->getMemOperand(), DAG);
if (SDValue Val = detectUSatPattern(St->getValue(), St->getMemoryVT(),
DAG, dl))
return EmitTruncSStore(false /* Unsigned saturation */, St->getChain(),
dl, Val, St->getBasePtr(),
St->getMemoryVT(), St->getMemOperand(), DAG);
}
return SDValue();
}