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

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 eaee560c96
commit d39c60fcc8
1 changed files with 6 additions and 6 deletions
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12
llvm/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();
}