replica
/
hanchenye-llvm-project
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

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
This commit is contained in:
Chris Lattner 2005-08-26 18:46:49 +00:00
parent a9e6a82d66
commit bec817ce6f
1 changed files with 21 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
View File

@ -1376,6 +1376,27 @@ SDOperand PPC32DAGToDAGISel::Select(SDOperand Op) {
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();