diff options
Diffstat (limited to 'llvm/lib/Transforms')
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstructionCombining.cpp | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp index 69a2661f031..b51ec291f91 100644 --- a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp +++ b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp @@ -1453,8 +1453,13 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) { } } - GetElementPtrInst *NewGEP = cast<GetElementPtrInst>(Op1->clone()); + // If not all GEPs are identical we'll have to create a new PHI node. + // Check that the old PHI node has only one use so that it will get + // removed. + if (DI != -1 && !PN->hasOneUse()) + return nullptr; + GetElementPtrInst *NewGEP = cast<GetElementPtrInst>(Op1->clone()); if (DI == -1) { // All the GEPs feeding the PHI are identical. Clone one down into our // BB so that it can be merged with the current GEP. |
