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Revert r70645 for now; it's causing a variety of regressions.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70661 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-05-03 05:46:20 +00:00
parent 0e670dfa27
commit f9a77b77c2
9 changed files with 119 additions and 52 deletions
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21
lib/Transforms/Utils/Local.cpp
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@@ -178,10 +178,18 @@ bool llvm::isInstructionTriviallyDead(Instruction *I) {
return false;
}
/// ~ValueDeletionListener - A trivial dtor, defined out of line to give the
/// class a home.
llvm::ValueDeletionListener::~ValueDeletionListener() {}
/// RecursivelyDeleteTriviallyDeadInstructions - If the specified value is a
/// trivially dead instruction, delete it. If that makes any of its operands
/// trivially dead, delete them too, recursively.
void llvm::RecursivelyDeleteTriviallyDeadInstructions(Value *V) {
///
/// If a ValueDeletionListener is specified, it is notified of instructions that
/// are actually deleted (before they are actually deleted).
void llvm::RecursivelyDeleteTriviallyDeadInstructions(Value *V,
ValueDeletionListener *VDL) {
Instruction *I = dyn_cast<Instruction>(V);
if (!I || !I->use_empty() || !isInstructionTriviallyDead(I))
return;
@@ -193,6 +201,10 @@ void llvm::RecursivelyDeleteTriviallyDeadInstructions(Value *V) {
I = DeadInsts.back();
DeadInsts.pop_back();
// If the client wanted to know, tell it about deleted instructions.
if (VDL)
VDL->ValueWillBeDeleted(I);
// Null out all of the instruction's operands to see if any operand becomes
// dead as we go.
for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i) {
@@ -218,8 +230,11 @@ void llvm::RecursivelyDeleteTriviallyDeadInstructions(Value *V) {
/// either forms a cycle or is terminated by a trivially dead instruction,
/// delete it. If that makes any of its operands trivially dead, delete them
/// too, recursively.
///
/// If a ValueDeletionListener is specified, it is notified of instructions that
/// are actually deleted (before they are actually deleted).
void
llvm::RecursivelyDeleteDeadPHINode(PHINode *PN) {
llvm::RecursivelyDeleteDeadPHINode(PHINode *PN, ValueDeletionListener *VDL) {
// We can remove a PHI if it is on a cycle in the def-use graph
// where each node in the cycle has degree one, i.e. only one use,
@@ -238,7 +253,7 @@ llvm::RecursivelyDeleteDeadPHINode(PHINode *PN) {
if (!PHIs.insert(cast<PHINode>(JP))) {
// Break the cycle and delete the PHI and its operands.
JP->replaceAllUsesWith(UndefValue::get(JP->getType()));
RecursivelyDeleteTriviallyDeadInstructions(JP);
RecursivelyDeleteTriviallyDeadInstructions(JP, VDL);
break;
}
}