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Don't duplicate the work done by a gep into a "bitcast" if the gep has

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more than one use.

Fixes PR10322.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134883 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2011-07-11 03:43:47 +00:00
parent f75ae4c977
commit b5a12dd12f
2 changed files with 24 additions and 0 deletions
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8
lib/Transforms/InstCombine/InstructionCombining.cpp
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@ -785,6 +785,14 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
// getelementptr instructions into a single instruction.
//
if (GEPOperator *Src = dyn_cast<GEPOperator>(PtrOp)) {
// If this GEP has only 0 indices, it is the same pointer as
// Src. If Src is not a trivial GEP too, don't combine
// the indices.
if (GEP.hasAllZeroIndices() && !Src->hasAllZeroIndices() &&
!Src->hasOneUse())
return 0;
// Note that if our source is a gep chain itself that we wait for that
// chain to be resolved before we perform this transformation. This
// avoids us creating a TON of code in some cases.