implement the fold for:
bool %test(int %X, int %Y) {
%C = setne int %X, 0
ret bool %C
}
to:
_test:
addic r2, r3, -1
subfe r3, r2, r3
blr
llvm-svn: 23089
diff --git a/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp b/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
index a0f55ad..8c0d6d0 100644
--- a/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
@@ -1376,6 +1376,27 @@
break;
}
+ case ISD::SELECT_CC: {
+ ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(4))->get();
+
+ // handle the setcc cases here. select_cc lhs, 0, 1, 0, cc
+ if (ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N->getOperand(1)))
+ if (ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N->getOperand(2)))
+ if (ConstantSDNode *N3C = dyn_cast<ConstantSDNode>(N->getOperand(3)))
+ if (N1C->isNullValue() && N3C->isNullValue() &&
+ N2C->getValue() == 1ULL && CC == ISD::SETNE) {
+ SDOperand LHS = Select(N->getOperand(0));
+ SDOperand Tmp =
+ CurDAG->getTargetNode(PPC::ADDIC, MVT::i32, MVT::Flag,
+ LHS, getI32Imm(~0U));
+ CurDAG->SelectNodeTo(N, PPC::SUBFE, MVT::i32, Tmp, LHS,
+ Tmp.getValue(1));
+ break;
+ }
+
+ assert(0 && "Select_cc not implemented yet!");
+ }
+
case ISD::CALLSEQ_START:
case ISD::CALLSEQ_END: {
unsigned Amt = cast<ConstantSDNode>(N->getOperand(1))->getValue();