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When folding loads into ops, immediately replace uses of the op with the

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load.  This reduces number of worklist iterations and avoid missing optimizations
depending on folding of things into sext_inreg nodes (which aren't supported by
all targets).
Tested by Regression/CodeGen/X86/extend.ll:test2

llvm-svn: 24712
This commit is contained in:
Chris Lattner 2005-12-14 19:25:30 +00:00
parent 696d16afce
commit 9bdaf3e826
1 changed files with 6 additions and 6 deletions
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12
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -1554,7 +1554,7 @@ SDOperand DAGCombiner::visitSIGN_EXTEND(SDNode *N) {
SDOperand ExtLoad = DAG.getExtLoad(ISD::SEXTLOAD, VT, N0.getOperand(0),
N0.getOperand(1), N0.getOperand(2),
N0.getValueType());
WorkList.push_back(N);
CombineTo(N, ExtLoad);
CombineTo(N0.Val, DAG.getNode(ISD::TRUNCATE, N0.getValueType(), ExtLoad),
ExtLoad.getValue(1));
return SDOperand();
@ -1567,7 +1567,7 @@ SDOperand DAGCombiner::visitSIGN_EXTEND(SDNode *N) {
SDOperand ExtLoad = DAG.getNode(ISD::SEXTLOAD, VT, N0.getOperand(0),
N0.getOperand(1), N0.getOperand(2),
N0.getOperand(3));
WorkList.push_back(N);
CombineTo(N, ExtLoad);
CombineTo(N0.Val, DAG.getNode(ISD::TRUNCATE, N0.getValueType(), ExtLoad),
ExtLoad.getValue(1));
return SDOperand();
@ -1596,7 +1596,7 @@ SDOperand DAGCombiner::visitZERO_EXTEND(SDNode *N) {
SDOperand ExtLoad = DAG.getExtLoad(ISD::ZEXTLOAD, VT, N0.getOperand(0),
N0.getOperand(1), N0.getOperand(2),
N0.getValueType());
WorkList.push_back(N);
CombineTo(N, ExtLoad);
CombineTo(N0.Val, DAG.getNode(ISD::TRUNCATE, N0.getValueType(), ExtLoad),
ExtLoad.getValue(1));
return SDOperand();
@ -1609,7 +1609,7 @@ SDOperand DAGCombiner::visitZERO_EXTEND(SDNode *N) {
SDOperand ExtLoad = DAG.getNode(ISD::ZEXTLOAD, VT, N0.getOperand(0),
N0.getOperand(1), N0.getOperand(2),
N0.getOperand(3));
WorkList.push_back(N);
CombineTo(N, ExtLoad);
CombineTo(N0.Val, DAG.getNode(ISD::TRUNCATE, N0.getValueType(), ExtLoad),
ExtLoad.getValue(1));
return SDOperand();
@ -1673,7 +1673,7 @@ SDOperand DAGCombiner::visitSIGN_EXTEND_INREG(SDNode *N) {
SDOperand ExtLoad = DAG.getExtLoad(ISD::SEXTLOAD, VT, N0.getOperand(0),
N0.getOperand(1), N0.getOperand(2),
EVT);
WorkList.push_back(N);
CombineTo(N, ExtLoad);
CombineTo(N0.Val, ExtLoad, ExtLoad.getValue(1));
return SDOperand();
}
@ -1684,7 +1684,7 @@ SDOperand DAGCombiner::visitSIGN_EXTEND_INREG(SDNode *N) {
SDOperand ExtLoad = DAG.getExtLoad(ISD::SEXTLOAD, VT, N0.getOperand(0),
N0.getOperand(1), N0.getOperand(2),
EVT);
WorkList.push_back(N);
CombineTo(N, ExtLoad);
CombineTo(N0.Val, ExtLoad, ExtLoad.getValue(1));
return SDOperand();
}