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Add missing check for presence of target data.

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This avoids a crash in visitAllocaInst when target data isn't available.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164539 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Richard Osborne
2012-09-24 17:10:03 +00:00
parent 84d882ee56
commit bdc76fc75a
2 changed files with 41 additions and 20 deletions
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42
lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
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@@ -264,26 +264,28 @@ Instruction *InstCombiner::visitAllocaInst(AllocaInst &AI) {
}
}
// Check to see if this allocation is only modified by a memcpy/memmove from
// a constant global whose alignment is equal to or exceeds that of the
// allocation. If this is the case, we can change all users to use
// the constant global instead. This is commonly produced by the CFE by
// constructs like "void foo() { int A[] = {1,2,3,4,5,6,7,8,9...}; }" if 'A'
// is only subsequently read.
SmallVector<Instruction *, 4> ToDelete;
if (MemTransferInst *Copy = isOnlyCopiedFromConstantGlobal(&AI, ToDelete)) {
if (AI.getAlignment() <= getPointeeAlignment(Copy->getSource(), *TD)) {
DEBUG(dbgs() << "Found alloca equal to global: " << AI << '\n');
DEBUG(dbgs() << " memcpy = " << *Copy << '\n');
for (unsigned i = 0, e = ToDelete.size(); i != e; ++i)
EraseInstFromFunction(*ToDelete[i]);
Constant *TheSrc = cast<Constant>(Copy->getSource());
Instruction *NewI
= ReplaceInstUsesWith(AI, ConstantExpr::getBitCast(TheSrc,
AI.getType()));
EraseInstFromFunction(*Copy);
++NumGlobalCopies;
return NewI;
if (TD) {
// Check to see if this allocation is only modified by a memcpy/memmove from
// a constant global whose alignment is equal to or exceeds that of the
// allocation. If this is the case, we can change all users to use
// the constant global instead. This is commonly produced by the CFE by
// constructs like "void foo() { int A[] = {1,2,3,4,5,6,7,8,9...}; }" if 'A'
// is only subsequently read.
SmallVector<Instruction *, 4> ToDelete;
if (MemTransferInst *Copy = isOnlyCopiedFromConstantGlobal(&AI, ToDelete)) {
if (AI.getAlignment() <= getPointeeAlignment(Copy->getSource(), *TD)) {
DEBUG(dbgs() << "Found alloca equal to global: " << AI << '\n');
DEBUG(dbgs() << " memcpy = " << *Copy << '\n');
for (unsigned i = 0, e = ToDelete.size(); i != e; ++i)
EraseInstFromFunction(*ToDelete[i]);
Constant *TheSrc = cast<Constant>(Copy->getSource());
Instruction *NewI
= ReplaceInstUsesWith(AI, ConstantExpr::getBitCast(TheSrc,
AI.getType()));
EraseInstFromFunction(*Copy);
++NumGlobalCopies;
return NewI;
}
}
}