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Fix PR 7191. I have been unable to create a .ll file that fails, sorry.

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(oye, a word which should be better known to people writing tree
traversals, means grandchild.)



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104619 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen 2010-05-25 17:50:03 +00:00
parent 7e2f5aaa67
commit 61734eb117
1 changed files with 10 additions and 2 deletions
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12
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -3431,8 +3431,12 @@ SDValue DAGCombiner::visitSIGN_EXTEND(SDNode *N) {
// fold (sext (truncate (srl (load x), c))) -> (sext (smaller load (x+c/n)))
SDValue NarrowLoad = ReduceLoadWidth(N0.getNode());
if (NarrowLoad.getNode()) {
if (NarrowLoad.getNode() != N0.getNode())
SDNode* oye = N0.getNode()->getOperand(0).getNode();
if (NarrowLoad.getNode() != N0.getNode()) {
CombineTo(N0.getNode(), NarrowLoad);
// CombineTo deleted the truncate, if needed, but not what's under it.
AddToWorkList(oye);
}
return SDValue(N, 0); // Return N so it doesn't get rechecked!
}
@ -3619,8 +3623,12 @@ SDValue DAGCombiner::visitZERO_EXTEND(SDNode *N) {
if (N0.getOpcode() == ISD::TRUNCATE) {
SDValue NarrowLoad = ReduceLoadWidth(N0.getNode());
if (NarrowLoad.getNode()) {
if (NarrowLoad.getNode() != N0.getNode())
SDNode* oye = N0.getNode()->getOperand(0).getNode();
if (NarrowLoad.getNode() != N0.getNode()) {
CombineTo(N0.getNode(), NarrowLoad);
// CombineTo deleted the truncate, if needed, but not what's under it.
AddToWorkList(oye);
}
return DAG.getNode(ISD::ZERO_EXTEND, N->getDebugLoc(), VT, NarrowLoad);
}
}