[llvm] r230354 - DAGCombiner: Move variable definitions closer to use; NFC
Matthias Braun
matze at braunis.de
Tue Feb 24 10:52:02 PST 2015
Author: matze
Date: Tue Feb 24 12:52:01 2015
New Revision: 230354
URL: http://llvm.org/viewvc/llvm-project?rev=230354&view=rev
Log:
DAGCombiner: Move variable definitions closer to use; NFC
Modified:
llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
Modified: llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp?rev=230354&r1=230353&r2=230354&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp Tue Feb 24 12:52:01 2015
@@ -1565,8 +1565,6 @@ SDValue DAGCombiner::visitMERGE_VALUES(S
SDValue DAGCombiner::visitADD(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
- ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
- ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
EVT VT = N0.getValueType();
// fold vector ops
@@ -1587,6 +1585,8 @@ SDValue DAGCombiner::visitADD(SDNode *N)
if (N1.getOpcode() == ISD::UNDEF)
return N1;
// fold (add c1, c2) -> c1+c2
+ ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
+ ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
if (N0C && N1C)
return DAG.FoldConstantArithmetic(ISD::ADD, VT, N0C, N1C);
// canonicalize constant to RHS
@@ -1738,8 +1738,6 @@ SDValue DAGCombiner::visitADD(SDNode *N)
SDValue DAGCombiner::visitADDC(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
- ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
- ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
EVT VT = N0.getValueType();
// If the flag result is dead, turn this into an ADD.
@@ -1749,6 +1747,8 @@ SDValue DAGCombiner::visitADDC(SDNode *N
SDLoc(N), MVT::Glue));
// canonicalize constant to RHS.
+ ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
+ ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
if (N0C && !N1C)
return DAG.getNode(ISD::ADDC, SDLoc(N), N->getVTList(), N1, N0);
@@ -1780,10 +1780,10 @@ SDValue DAGCombiner::visitADDE(SDNode *N
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
SDValue CarryIn = N->getOperand(2);
- ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
- ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
// canonicalize constant to RHS
+ ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
+ ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
if (N0C && !N1C)
return DAG.getNode(ISD::ADDE, SDLoc(N), N->getVTList(),
N1, N0, CarryIn);
@@ -1810,10 +1810,6 @@ static SDValue tryFoldToZero(SDLoc DL, c
SDValue DAGCombiner::visitSUB(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
- ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0.getNode());
- ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode());
- ConstantSDNode *N1C1 = N1.getOpcode() != ISD::ADD ? nullptr :
- dyn_cast<ConstantSDNode>(N1.getOperand(1).getNode());
EVT VT = N0.getValueType();
// fold vector ops
@@ -1831,6 +1827,8 @@ SDValue DAGCombiner::visitSUB(SDNode *N)
if (N0 == N1)
return tryFoldToZero(SDLoc(N), TLI, VT, DAG, LegalOperations, LegalTypes);
// fold (sub c1, c2) -> c1-c2
+ ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0.getNode());
+ ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode());
if (N0C && N1C)
return DAG.FoldConstantArithmetic(ISD::SUB, VT, N0C, N1C);
// fold (sub x, c) -> (add x, -c)
@@ -1850,6 +1848,8 @@ SDValue DAGCombiner::visitSUB(SDNode *N)
if (N0.getOpcode() == ISD::ADD && N0.getOperand(1) == N1)
return N0.getOperand(0);
// fold C2-(A+C1) -> (C2-C1)-A
+ ConstantSDNode *N1C1 = N1.getOpcode() != ISD::ADD ? nullptr :
+ dyn_cast<ConstantSDNode>(N1.getOperand(1).getNode());
if (N1.getOpcode() == ISD::ADD && N0C && N1C1) {
SDValue NewC = DAG.getConstant(N0C->getAPIntValue() - N1C1->getAPIntValue(),
VT);
@@ -1914,8 +1914,6 @@ SDValue DAGCombiner::visitSUB(SDNode *N)
SDValue DAGCombiner::visitSUBC(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
- ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
- ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
EVT VT = N0.getValueType();
// If the flag result is dead, turn this into an SUB.
@@ -1931,6 +1929,8 @@ SDValue DAGCombiner::visitSUBC(SDNode *N
MVT::Glue));
// fold (subc x, 0) -> x + no borrow
+ ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
+ ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
if (N1C && N1C->isNullValue())
return CombineTo(N, N0, DAG.getNode(ISD::CARRY_FALSE, SDLoc(N),
MVT::Glue));
@@ -2079,8 +2079,6 @@ SDValue DAGCombiner::visitMUL(SDNode *N)
SDValue DAGCombiner::visitSDIV(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
- ConstantSDNode *N0C = isConstOrConstSplat(N0);
- ConstantSDNode *N1C = isConstOrConstSplat(N1);
EVT VT = N->getValueType(0);
// fold vector ops
@@ -2090,6 +2088,8 @@ SDValue DAGCombiner::visitSDIV(SDNode *N
}
// fold (sdiv c1, c2) -> c1/c2
+ ConstantSDNode *N0C = isConstOrConstSplat(N0);
+ ConstantSDNode *N1C = isConstOrConstSplat(N1);
if (N0C && N1C && !N1C->isNullValue())
return DAG.FoldConstantArithmetic(ISD::SDIV, VT, N0C, N1C);
// fold (sdiv X, 1) -> X
@@ -2169,8 +2169,6 @@ SDValue DAGCombiner::visitSDIV(SDNode *N
SDValue DAGCombiner::visitUDIV(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
- ConstantSDNode *N0C = isConstOrConstSplat(N0);
- ConstantSDNode *N1C = isConstOrConstSplat(N1);
EVT VT = N->getValueType(0);
// fold vector ops
@@ -2180,6 +2178,8 @@ SDValue DAGCombiner::visitUDIV(SDNode *N
}
// fold (udiv c1, c2) -> c1/c2
+ ConstantSDNode *N0C = isConstOrConstSplat(N0);
+ ConstantSDNode *N1C = isConstOrConstSplat(N1);
if (N0C && N1C && !N1C->isNullValue())
return DAG.FoldConstantArithmetic(ISD::UDIV, VT, N0C, N1C);
// fold (udiv x, (1 << c)) -> x >>u c
@@ -2221,11 +2221,11 @@ SDValue DAGCombiner::visitUDIV(SDNode *N
SDValue DAGCombiner::visitSREM(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
- ConstantSDNode *N0C = isConstOrConstSplat(N0);
- ConstantSDNode *N1C = isConstOrConstSplat(N1);
EVT VT = N->getValueType(0);
// fold (srem c1, c2) -> c1%c2
+ ConstantSDNode *N0C = isConstOrConstSplat(N0);
+ ConstantSDNode *N1C = isConstOrConstSplat(N1);
if (N0C && N1C && !N1C->isNullValue())
return DAG.FoldConstantArithmetic(ISD::SREM, VT, N0C, N1C);
// If we know the sign bits of both operands are zero, strength reduce to a
@@ -2263,11 +2263,11 @@ SDValue DAGCombiner::visitSREM(SDNode *N
SDValue DAGCombiner::visitUREM(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
- ConstantSDNode *N0C = isConstOrConstSplat(N0);
- ConstantSDNode *N1C = isConstOrConstSplat(N1);
EVT VT = N->getValueType(0);
// fold (urem c1, c2) -> c1%c2
+ ConstantSDNode *N0C = isConstOrConstSplat(N0);
+ ConstantSDNode *N1C = isConstOrConstSplat(N1);
if (N0C && N1C && !N1C->isNullValue())
return DAG.FoldConstantArithmetic(ISD::UREM, VT, N0C, N1C);
// fold (urem x, pow2) -> (and x, pow2-1)
@@ -2688,10 +2688,7 @@ SDValue DAGCombiner::SimplifyBinOpWithSa
SDValue DAGCombiner::visitAND(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
- ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
- ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
EVT VT = N1.getValueType();
- unsigned BitWidth = VT.getScalarType().getSizeInBits();
// fold vector ops
if (VT.isVector()) {
@@ -2723,6 +2720,8 @@ SDValue DAGCombiner::visitAND(SDNode *N)
if (N0.getOpcode() == ISD::UNDEF || N1.getOpcode() == ISD::UNDEF)
return DAG.getConstant(0, VT);
// fold (and c1, c2) -> c1&c2
+ ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
+ ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
if (N0C && N1C)
return DAG.FoldConstantArithmetic(ISD::AND, VT, N0C, N1C);
// canonicalize constant to RHS
@@ -2732,6 +2731,7 @@ SDValue DAGCombiner::visitAND(SDNode *N)
if (N1C && N1C->isAllOnesValue())
return N0;
// if (and x, c) is known to be zero, return 0
+ unsigned BitWidth = VT.getScalarType().getSizeInBits();
if (N1C && DAG.MaskedValueIsZero(SDValue(N, 0),
APInt::getAllOnesValue(BitWidth)))
return DAG.getConstant(0, VT);
@@ -3341,8 +3341,6 @@ SDValue DAGCombiner::MatchBSwapHWord(SDN
SDValue DAGCombiner::visitOR(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
- ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
- ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
EVT VT = N1.getValueType();
// fold vector ops
@@ -3434,6 +3432,8 @@ SDValue DAGCombiner::visitOR(SDNode *N)
return DAG.getConstant(APInt::getAllOnesValue(EltVT.getSizeInBits()), VT);
}
// fold (or c1, c2) -> c1|c2
+ ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
+ ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
if (N0C && N1C)
return DAG.FoldConstantArithmetic(ISD::OR, VT, N0C, N1C);
// canonicalize constant to RHS
@@ -3828,8 +3828,6 @@ SDNode *DAGCombiner::MatchRotate(SDValue
SDValue DAGCombiner::visitXOR(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
- ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
- ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
EVT VT = N0.getValueType();
// fold vector ops
@@ -3853,6 +3851,8 @@ SDValue DAGCombiner::visitXOR(SDNode *N)
if (N1.getOpcode() == ISD::UNDEF)
return N1;
// fold (xor c1, c2) -> c1^c2
+ ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
+ ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
if (N0C && N1C)
return DAG.FoldConstantArithmetic(ISD::XOR, VT, N0C, N1C);
// canonicalize constant to RHS
@@ -4077,12 +4077,11 @@ SDValue DAGCombiner::visitRotate(SDNode
SDValue DAGCombiner::visitSHL(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
- ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
- ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
EVT VT = N0.getValueType();
unsigned OpSizeInBits = VT.getScalarSizeInBits();
// fold vector ops
+ ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
if (VT.isVector()) {
SDValue FoldedVOp = SimplifyVBinOp(N);
if (FoldedVOp.getNode()) return FoldedVOp;
@@ -4109,6 +4108,7 @@ SDValue DAGCombiner::visitSHL(SDNode *N)
}
// fold (shl c1, c2) -> c1<<c2
+ ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
if (N0C && N1C)
return DAG.FoldConstantArithmetic(ISD::SHL, VT, N0C, N1C);
// fold (shl 0, x) -> 0
@@ -4257,12 +4257,11 @@ SDValue DAGCombiner::visitSHL(SDNode *N)
SDValue DAGCombiner::visitSRA(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
- ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
- ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
EVT VT = N0.getValueType();
unsigned OpSizeInBits = VT.getScalarType().getSizeInBits();
// fold vector ops
+ ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
if (VT.isVector()) {
SDValue FoldedVOp = SimplifyVBinOp(N);
if (FoldedVOp.getNode()) return FoldedVOp;
@@ -4271,6 +4270,7 @@ SDValue DAGCombiner::visitSRA(SDNode *N)
}
// fold (sra c1, c2) -> (sra c1, c2)
+ ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
if (N0C && N1C)
return DAG.FoldConstantArithmetic(ISD::SRA, VT, N0C, N1C);
// fold (sra 0, x) -> 0
@@ -4403,12 +4403,11 @@ SDValue DAGCombiner::visitSRA(SDNode *N)
SDValue DAGCombiner::visitSRL(SDNode *N) {
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
- ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
- ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
EVT VT = N0.getValueType();
unsigned OpSizeInBits = VT.getScalarType().getSizeInBits();
// fold vector ops
+ ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
if (VT.isVector()) {
SDValue FoldedVOp = SimplifyVBinOp(N);
if (FoldedVOp.getNode()) return FoldedVOp;
@@ -4417,6 +4416,7 @@ SDValue DAGCombiner::visitSRL(SDNode *N)
}
// fold (srl c1, c2) -> c1 >>u c2
+ ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
if (N0C && N1C)
return DAG.FoldConstantArithmetic(ISD::SRL, VT, N0C, N1C);
// fold (srl 0, x) -> 0
@@ -4686,9 +4686,6 @@ SDValue DAGCombiner::visitSELECT(SDNode
SDValue N0 = N->getOperand(0);
SDValue N1 = N->getOperand(1);
SDValue N2 = N->getOperand(2);
- ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
- ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
- ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2);
EVT VT = N->getValueType(0);
EVT VT0 = N0.getValueType();
@@ -4696,12 +4693,14 @@ SDValue DAGCombiner::visitSELECT(SDNode
if (N1 == N2)
return N1;
// fold (select true, X, Y) -> X
+ ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
if (N0C && !N0C->isNullValue())
return N1;
// fold (select false, X, Y) -> Y
if (N0C && N0C->isNullValue())
return N2;
// fold (select C, 1, X) -> (or C, X)
+ ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
if (VT == MVT::i1 && N1C && N1C->getAPIntValue() == 1)
return DAG.getNode(ISD::OR, SDLoc(N), VT, N0, N2);
// fold (select C, 0, 1) -> (xor C, 1)
@@ -4713,6 +4712,7 @@ SDValue DAGCombiner::visitSELECT(SDNode
// undiscoverable (or not reasonably discoverable). For example, it could be
// in another basic block or it could require searching a complicated
// expression.
+ ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2);
if (VT.isInteger() &&
(VT0 == MVT::i1 || (VT0.isInteger() &&
TLI.getBooleanContents(false, false) ==
@@ -7817,11 +7817,11 @@ SDValue DAGCombiner::visitFCOPYSIGN(SDNo
SDValue DAGCombiner::visitSINT_TO_FP(SDNode *N) {
SDValue N0 = N->getOperand(0);
- ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
EVT VT = N->getValueType(0);
EVT OpVT = N0.getValueType();
// fold (sint_to_fp c1) -> c1fp
+ ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
if (N0C &&
// ...but only if the target supports immediate floating-point values
(!LegalOperations ||
@@ -7870,11 +7870,11 @@ SDValue DAGCombiner::visitSINT_TO_FP(SDN
SDValue DAGCombiner::visitUINT_TO_FP(SDNode *N) {
SDValue N0 = N->getOperand(0);
- ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
EVT VT = N->getValueType(0);
EVT OpVT = N0.getValueType();
// fold (uint_to_fp c1) -> c1fp
+ ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
if (N0C &&
// ...but only if the target supports immediate floating-point values
(!LegalOperations ||
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