SimplifyCFG: GEPs with just one non-constant index are also cheap.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126452 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Utils/SimplifyCFG.cpp b/lib/Transforms/Utils/SimplifyCFG.cpp
index c670885..3968d6e 100644
--- a/lib/Transforms/Utils/SimplifyCFG.cpp
+++ b/lib/Transforms/Utils/SimplifyCFG.cpp
@@ -247,11 +247,13 @@
if (PBB->getFirstNonPHIOrDbg() != I)
return false;
break;
- case Instruction::GetElementPtr:
- // GEPs are cheap if all indices are constant.
- if (!cast<GetElementPtrInst>(I)->hasAllConstantIndices())
+ case Instruction::GetElementPtr: {
+ // GEPs are cheap if all indices are constant or if there's only one index.
+ GetElementPtrInst *GEP = cast<GetElementPtrInst>(I);
+ if (!GEP->hasAllConstantIndices() && GEP->getNumIndices() > 1)
return false;
break;
+ }
case Instruction::Add:
case Instruction::Sub:
case Instruction::And: