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Fix handling of dead PHI nodes.

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llvm-svn: 19349
This commit is contained in:
Chris Lattner 2005-01-07 21:34:19 +00:00
parent d671aa053c
commit 86601673d6
1 changed files with 30 additions and 26 deletions
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12
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -141,8 +141,10 @@ FunctionLoweringInfo::FunctionLoweringInfo(TargetLowering &tli,
// appropriate.
PHINode *PN;
for (BasicBlock::iterator I = BB->begin();
(PN = dyn_cast<PHINode>(I)); ++I) {
unsigned NumElements =TLI.getNumElements(TLI.getValueType(PN->getType()));
(PN = dyn_cast<PHINode>(I)); ++I)
if (!PN->use_empty()) {
unsigned NumElements =
TLI.getNumElements(TLI.getValueType(PN->getType()));
unsigned PHIReg = ValueMap[PN];
assert(PHIReg &&"PHI node does not have an assigned virtual register!");
for (unsigned i = 0; i != NumElements; ++i)
@ -786,7 +788,8 @@ void SelectionDAGISel::BuildSelectionDAG(SelectionDAG &DAG, BasicBlock *LLVMBB,
// nodes and Machine PHI nodes, but the incoming operands have not been
// emitted yet.
for (BasicBlock::iterator I = SuccBB->begin();
(PN = dyn_cast<PHINode>(I)); ++I) {
(PN = dyn_cast<PHINode>(I)); ++I)
if (!PN->use_empty()) {
unsigned Reg;
Value *PHIOp = PN->getIncomingValueForBlock(LLVMBB);
if (Constant *C = dyn_cast<Constant>(PHIOp)) {
@ -803,7 +806,8 @@ void SelectionDAGISel::BuildSelectionDAG(SelectionDAG &DAG, BasicBlock *LLVMBB,
// Remember that this register needs to added to the machine PHI node as
// the input for this MBB.
unsigned NumElements =TLI.getNumElements(TLI.getValueType(PN->getType()));
unsigned NumElements =
TLI.getNumElements(TLI.getValueType(PN->getType()));
for (unsigned i = 0, e = NumElements; i != e; ++i)
PHINodesToUpdate.push_back(std::make_pair(MBBI++, Reg+i));
}