Code refactoring.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92694 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 1a81a3e..6ca24f5 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -5681,13 +5681,8 @@
return DAG.getNode(X86ISD::CMP, dl, MVT::i32, Op0, Op1);
}
-SDValue X86TargetLowering::LowerSETCC(SDValue Op, SelectionDAG &DAG) {
- assert(Op.getValueType() == MVT::i8 && "SetCC type must be 8-bit integer");
- SDValue Op0 = Op.getOperand(0);
- SDValue Op1 = Op.getOperand(1);
- DebugLoc dl = Op.getDebugLoc();
- ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
-
+static SDValue LowerToBT(SDValue Op0, SDValue Op1, ISD::CondCode CC,
+ DebugLoc dl, SelectionDAG &DAG) {
// Lower (X & (1 << N)) == 0 to BT(X, N).
// Lower ((X >>u N) & 1) != 0 to BT(X, N).
// Lower ((X >>s N) & 1) != 0 to BT(X, N).
@@ -5699,14 +5694,14 @@
SDValue LHS, RHS;
if (Op0.getOperand(1).getOpcode() == ISD::SHL) {
if (ConstantSDNode *Op010C =
- dyn_cast<ConstantSDNode>(Op0.getOperand(1).getOperand(0)))
+ dyn_cast<ConstantSDNode>(Op0.getOperand(1).getOperand(0)))
if (Op010C->getZExtValue() == 1) {
LHS = Op0.getOperand(0);
RHS = Op0.getOperand(1).getOperand(1);
}
} else if (Op0.getOperand(0).getOpcode() == ISD::SHL) {
if (ConstantSDNode *Op000C =
- dyn_cast<ConstantSDNode>(Op0.getOperand(0).getOperand(0)))
+ dyn_cast<ConstantSDNode>(Op0.getOperand(0).getOperand(0)))
if (Op000C->getZExtValue() == 1) {
LHS = Op0.getOperand(1);
RHS = Op0.getOperand(0).getOperand(1);
@@ -5740,6 +5735,21 @@
}
}
+ return SDValue();
+}
+
+SDValue X86TargetLowering::LowerSETCC(SDValue Op, SelectionDAG &DAG) {
+ assert(Op.getValueType() == MVT::i8 && "SetCC type must be 8-bit integer");
+ SDValue Op0 = Op.getOperand(0);
+ SDValue Op1 = Op.getOperand(1);
+ DebugLoc dl = Op.getDebugLoc();
+ ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
+
+ // Optimize to BT if possible.
+ SDValue NewCond = LowerToBT(Op0, Op1, CC, dl, DAG);
+ if (NewCond.getNode())
+ return NewCond;
+
bool isFP = Op.getOperand(1).getValueType().isFloatingPoint();
unsigned X86CC = TranslateX86CC(CC, isFP, Op0, Op1, DAG);
if (X86CC == X86::COND_INVALID)