[llvm-commits] [llvm] r107868 - /llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
Benjamin Kramer
benny.kra at googlemail.com
Thu Jul 8 05:09:56 PDT 2010
Author: d0k
Date: Thu Jul 8 07:09:56 2010
New Revision: 107868
URL: http://llvm.org/viewvc/llvm-project?rev=107868&view=rev
Log:
Merge the duplicated iabs optimization in DAGCombiner and let it detected a few more idioms.
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=107868&r1=107867&r2=107868&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/DAGCombiner.cpp Thu Jul 8 07:09:56 2010
@@ -6892,38 +6892,34 @@
}
}
- // Check to see if this is an integer abs. select_cc setl[te] X, 0, -X, X ->
+ // Check to see if this is an integer abs.
+ // select_cc setg[te] X, 0, X, -X ->
+ // select_cc setgt X, -1, X, -X ->
+ // select_cc setl[te] X, 0, -X, X ->
+ // select_cc setlt X, 1, -X, X ->
// Y = sra (X, size(X)-1); xor (add (X, Y), Y)
- if (N1C && N1C->isNullValue() && (CC == ISD::SETLT || CC == ISD::SETLE) &&
- N0 == N3 && N2.getOpcode() == ISD::SUB && N0 == N2.getOperand(1) &&
- N2.getOperand(0) == N1 && N0.getValueType().isInteger()) {
+ if (N1C) {
+ ConstantSDNode *SubC = NULL;
+ if (((N1C->isNullValue() && (CC == ISD::SETGT || CC == ISD::SETGE)) ||
+ (N1C->isAllOnesValue() && CC == ISD::SETGT)) &&
+ N0 == N2 && N3.getOpcode() == ISD::SUB && N0 == N3.getOperand(1))
+ SubC = dyn_cast<ConstantSDNode>(N3.getOperand(0));
+ else if (((N1C->isNullValue() && (CC == ISD::SETLT || CC == ISD::SETLE)) ||
+ (N1C->isOne() && CC == ISD::SETLT)) &&
+ N0 == N3 && N2.getOpcode() == ISD::SUB && N0 == N2.getOperand(1))
+ SubC = dyn_cast<ConstantSDNode>(N2.getOperand(0));
+
EVT XType = N0.getValueType();
- SDValue Shift = DAG.getNode(ISD::SRA, N0.getDebugLoc(), XType, N0,
- DAG.getConstant(XType.getSizeInBits()-1,
- getShiftAmountTy()));
- SDValue Add = DAG.getNode(ISD::ADD, N0.getDebugLoc(), XType,
- N0, Shift);
- AddToWorkList(Shift.getNode());
- AddToWorkList(Add.getNode());
- return DAG.getNode(ISD::XOR, DL, XType, Add, Shift);
- }
- // Check to see if this is an integer abs. select_cc setgt X, -1, X, -X ->
- // Y = sra (X, size(X)-1); xor (add (X, Y), Y)
- if (N1C && N1C->isAllOnesValue() && CC == ISD::SETGT &&
- N0 == N2 && N3.getOpcode() == ISD::SUB && N0 == N3.getOperand(1)) {
- if (ConstantSDNode *SubC = dyn_cast<ConstantSDNode>(N3.getOperand(0))) {
- EVT XType = N0.getValueType();
- if (SubC->isNullValue() && XType.isInteger()) {
- SDValue Shift = DAG.getNode(ISD::SRA, N0.getDebugLoc(), XType,
- N0,
- DAG.getConstant(XType.getSizeInBits()-1,
- getShiftAmountTy()));
- SDValue Add = DAG.getNode(ISD::ADD, N0.getDebugLoc(),
- XType, N0, Shift);
- AddToWorkList(Shift.getNode());
- AddToWorkList(Add.getNode());
- return DAG.getNode(ISD::XOR, DL, XType, Add, Shift);
- }
+ if (SubC && SubC->isNullValue() && XType.isInteger()) {
+ SDValue Shift = DAG.getNode(ISD::SRA, N0.getDebugLoc(), XType,
+ N0,
+ DAG.getConstant(XType.getSizeInBits()-1,
+ getShiftAmountTy()));
+ SDValue Add = DAG.getNode(ISD::ADD, N0.getDebugLoc(),
+ XType, N0, Shift);
+ AddToWorkList(Shift.getNode());
+ AddToWorkList(Add.getNode());
+ return DAG.getNode(ISD::XOR, DL, XType, Add, Shift);
}
}
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