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Added missing comment about new custom lowering of DEC64

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144811 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Pete Cooper 2011-11-16 19:03:23 +00:00
parent c3aa7c5c5a
commit cd75e44173
1 changed files with 12 additions and 0 deletions
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12
lib/Target/X86/X86ISelDAGToDAG.cpp
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@ -2217,6 +2217,18 @@ SDNode *X86DAGToDAGISel::Select(SDNode *Node) {
break;
}
case ISD::STORE: {
// The DEC64m tablegen pattern is currently not able to match the case where
// the EFLAGS on the original DEC are used.
// we'll need to improve tablegen to allow flags to be transferred from a
// node in the pattern to the result node. probably with a new keyword
// for example, we have this
// def DEC64m : RI<0xFF, MRM1m, (outs), (ins i64mem:$dst), "dec{q}\t$dst",
// [(store (add (loadi64 addr:$dst), -1), addr:$dst),
// (implicit EFLAGS)]>;
// but maybe need something like this
// def DEC64m : RI<0xFF, MRM1m, (outs), (ins i64mem:$dst), "dec{q}\t$dst",
// [(store (add (loadi64 addr:$dst), -1), addr:$dst),
// (transferrable EFLAGS)]>;
StoreSDNode *StoreNode = cast<StoreSDNode>(Node);
SDValue Chain = StoreNode->getOperand(0);
SDValue StoredVal = StoreNode->getOperand(1);