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Per review feedback: Only perform

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(srl x, (trunc (and y, c))) -> (srl x, (and (trunc y), c))
etc. when both "trunc" and "and" have single uses.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56452 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-09-22 18:19:24 +00:00
parent 290ae0398e
commit 242ebd145d
1 changed files with 27 additions and 39 deletions
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66
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -2312,21 +2312,17 @@ SDValue DAGCombiner::visitSHL(SDNode *N) {
// fold (shl x, (trunc (and y, c))) -> (shl x, (and (trunc y), c))
// iff (trunc c) == c
if (N1.getOpcode() == ISD::TRUNCATE &&
N1.getOperand(0).getOpcode() == ISD::AND) {
N1.getOperand(0).getOpcode() == ISD::AND &&
N1.hasOneUse() && N1.getOperand(0).hasOneUse()) {
SDValue N101 = N1.getOperand(0).getOperand(1);
ConstantSDNode *N101C = dyn_cast<ConstantSDNode>(N101);
if (N101C) {
if (ConstantSDNode *N101C = dyn_cast<ConstantSDNode>(N101)) {
MVT TruncVT = N1.getValueType();
unsigned TruncBitSize = TruncVT.getSizeInBits();
APInt ShAmt = N101C->getAPIntValue();
if (ShAmt.trunc(TruncBitSize).getZExtValue() == N101C->getZExtValue()) {
SDValue N100 = N1.getOperand(0).getOperand(0);
return DAG.getNode(ISD::SHL, VT, N0,
DAG.getNode(ISD::AND, TruncVT,
DAG.getNode(ISD::TRUNCATE, TruncVT, N100),
DAG.getConstant(N101C->getZExtValue(),
TruncVT)));
}
SDValue N100 = N1.getOperand(0).getOperand(0);
return DAG.getNode(ISD::SHL, VT, N0,
DAG.getNode(ISD::AND, TruncVT,
DAG.getNode(ISD::TRUNCATE, TruncVT, N100),
DAG.getConstant(N101C->getZExtValue(),
TruncVT)));
}
}
@ -2444,21 +2440,17 @@ SDValue DAGCombiner::visitSRA(SDNode *N) {
// fold (sra x, (trunc (and y, c))) -> (sra x, (and (trunc y), c))
// iff (trunc c) == c
if (N1.getOpcode() == ISD::TRUNCATE &&
N1.getOperand(0).getOpcode() == ISD::AND) {
N1.getOperand(0).getOpcode() == ISD::AND &&
N1.hasOneUse() && N1.getOperand(0).hasOneUse()) {
SDValue N101 = N1.getOperand(0).getOperand(1);
ConstantSDNode *N101C = dyn_cast<ConstantSDNode>(N101);
if (N101C) {
if (ConstantSDNode *N101C = dyn_cast<ConstantSDNode>(N101)) {
MVT TruncVT = N1.getValueType();
unsigned TruncBitSize = TruncVT.getSizeInBits();
APInt ShAmt = N101C->getAPIntValue();
if (ShAmt.trunc(TruncBitSize).getZExtValue() == N101C->getZExtValue()) {
SDValue N100 = N1.getOperand(0).getOperand(0);
return DAG.getNode(ISD::SRA, VT, N0,
DAG.getNode(ISD::AND, TruncVT,
DAG.getNode(ISD::TRUNCATE, TruncVT, N100),
DAG.getConstant(N101C->getZExtValue(),
TruncVT)));
}
SDValue N100 = N1.getOperand(0).getOperand(0);
return DAG.getNode(ISD::SRA, VT, N0,
DAG.getNode(ISD::AND, TruncVT,
DAG.getNode(ISD::TRUNCATE, TruncVT, N100),
DAG.getConstant(N101C->getZExtValue(),
TruncVT)));
}
}
@ -2565,21 +2557,17 @@ SDValue DAGCombiner::visitSRL(SDNode *N) {
// fold (srl x, (trunc (and y, c))) -> (srl x, (and (trunc y), c))
// iff (trunc c) == c
if (N1.getOpcode() == ISD::TRUNCATE &&
N1.getOperand(0).getOpcode() == ISD::AND) {
N1.getOperand(0).getOpcode() == ISD::AND &&
N1.hasOneUse() && N1.getOperand(0).hasOneUse()) {
SDValue N101 = N1.getOperand(0).getOperand(1);
ConstantSDNode *N101C = dyn_cast<ConstantSDNode>(N101);
if (N101C) {
if (ConstantSDNode *N101C = dyn_cast<ConstantSDNode>(N101)) {
MVT TruncVT = N1.getValueType();
unsigned TruncBitSize = TruncVT.getSizeInBits();
APInt ShAmt = N101C->getAPIntValue();
if (ShAmt.trunc(TruncBitSize).getZExtValue() == N101C->getZExtValue()) {
SDValue N100 = N1.getOperand(0).getOperand(0);
return DAG.getNode(ISD::SRL, VT, N0,
DAG.getNode(ISD::AND, TruncVT,
DAG.getNode(ISD::TRUNCATE, TruncVT, N100),
DAG.getConstant(N101C->getZExtValue(),
TruncVT)));
}
SDValue N100 = N1.getOperand(0).getOperand(0);
return DAG.getNode(ISD::SRL, VT, N0,
DAG.getNode(ISD::AND, TruncVT,
DAG.getNode(ISD::TRUNCATE, TruncVT, N100),
DAG.getConstant(N101C->getZExtValue(),
TruncVT)));
}
}