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Fix another case where a dbg.declare meant something

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had 2 uses instead of 1.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66112 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen 2009-03-05 00:39:02 +00:00
parent 85435046ac
commit a0a6637b25
1 changed files with 13 additions and 6 deletions
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19
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -7502,8 +7502,10 @@ Instruction *InstCombiner::PromoteCastOfAllocation(BitCastInst &CI,
// If the allocation has multiple uses, only promote it if we are strictly
// increasing the alignment of the resultant allocation. If we keep it the
// same, we open the door to infinite loops of various kinds.
if (!AI.hasOneUse() && CastElTyAlign == AllocElTyAlign) return 0;
// same, we open the door to infinite loops of various kinds. (A reference
// from a dbg.declare doesn't count as a use for this purpose.)
if (!AI.hasOneUse() && !hasOneUsePlusDeclare(&AI) &&
CastElTyAlign == AllocElTyAlign) return 0;
uint64_t AllocElTySize = TD->getTypePaddedSize(AllocElTy);
uint64_t CastElTySize = TD->getTypePaddedSize(CastElTy);
@ -7551,10 +7553,15 @@ Instruction *InstCombiner::PromoteCastOfAllocation(BitCastInst &CI,
InsertNewInstBefore(New, AI);
New->takeName(&AI);
// If the allocation has multiple uses, insert a cast and change all things
// that used it to use the new cast. This will also hack on CI, but it will
// die soon.
if (!AI.hasOneUse()) {
// If the allocation has one real use plus a dbg.declare, just remove the
// declare.
if (DbgDeclareInst *DI = hasOneUsePlusDeclare(&AI)) {
EraseInstFromFunction(*DI);
}
// If the allocation has multiple real uses, insert a cast and change all
// things that used it to use the new cast. This will also hack on CI, but it
// will die soon.
else if (!AI.hasOneUse()) {
AddUsesToWorkList(AI);
// New is the allocation instruction, pointer typed. AI is the original
// allocation instruction, also pointer typed. Thus, cast to use is BitCast.