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Rework r58829, allowing removal of dbg info intrinsics during alloca

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promotion.
 - Eliminate uses after free and simplify tests.

Devang: Please check that this is still doing what you intended.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58887 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar 2008-11-08 04:12:17 +00:00
parent 77e0c85dcc
commit 746867c8b6
1 changed files with 24 additions and 20 deletions
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44
lib/Transforms/Utils/PromoteMemoryToRegister.cpp
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@ -80,19 +80,12 @@ bool llvm::isAllocaPromotable(const AllocaInst *AI) {
return false; // Don't allow a store OF the AI, only INTO the AI.
if (SI->isVolatile())
return false;
} else if (const BitCastInst *BC = dyn_cast<BitCastInst>(*UI)) {
// Uses by dbg info shouldn't inhibit promotion.
if (!BC->hasOneUse() || !isa<DbgInfoIntrinsic>(*BC->use_begin()))
return false;
} else {
const BitCastInst *BC = dyn_cast<BitCastInst>(*UI);
if (!BC)
return false; // Not a load or store or dbg intrinsic.
Value::use_const_iterator BCUI = BC->use_begin(), BCUE = BC->use_end();
if (BCUI == BCUE)
return false; // Not a dbg intrinsic.
const DbgInfoIntrinsic *DI = dyn_cast<DbgInfoIntrinsic>(*BCUI);
if (!DI)
return false; // Not a dbg intrinsic.
BCUI++;
if (BCUI != BCUE)
return false; // Not a dbg intrinsic use.
return false;
}
return true;
@ -284,6 +277,21 @@ namespace {
AllocaPointerVal = 0;
}
/// RemoveDebugUses - Remove uses of the alloca in DbgInfoInstrinsics.
void RemoveDebugUses(AllocaInst *AI) {
for (Value::use_iterator U = AI->use_begin(), E = AI->use_end();
U != E;) {
Instruction *User = cast<Instruction>(*U);
++U;
if (BitCastInst *BC = dyn_cast<BitCastInst>(User)) {
assert(BC->hasOneUse() && "Unexpected alloca uses!");
DbgInfoIntrinsic *DI = cast<DbgInfoIntrinsic>(*BC->use_begin());
DI->eraseFromParent();
BC->eraseFromParent();
}
}
}
/// AnalyzeAlloca - Scan the uses of the specified alloca, filling in our
/// ivars.
void AnalyzeAlloca(AllocaInst *AI) {
@ -295,14 +303,7 @@ namespace {
for (Value::use_iterator U = AI->use_begin(), E = AI->use_end();
U != E; ++U) {
Instruction *User = cast<Instruction>(*U);
if (BitCastInst *BC = dyn_cast<BitCastInst>(User)) {
// Remove dbg intrinsic uses now.
Value::use_iterator BCUI = BC->use_begin();
DbgInfoIntrinsic *DI = cast<DbgInfoIntrinsic>(*BCUI);
assert (next(BCUI) == BC->use_end() && "Unexpected alloca uses!");
DI->eraseFromParent();
BC->eraseFromParent();
} else if (StoreInst *SI = dyn_cast<StoreInst>(User)) {
if (StoreInst *SI = dyn_cast<StoreInst>(User)) {
// Remember the basic blocks which define new values for the alloca
DefiningBlocks.push_back(SI->getParent());
AllocaPointerVal = SI->getOperand(0);
@ -343,6 +344,9 @@ void PromoteMem2Reg::run() {
assert(AI->getParent()->getParent() == &F &&
"All allocas should be in the same function, which is same as DF!");
// Remove any uses of this alloca in DbgInfoInstrinsics.
Info.RemoveDebugUses(AI);
if (AI->use_empty()) {
// If there are no uses of the alloca, just delete it now.
if (AST) AST->deleteValue(AI);