[opaque pointer types] Pass value type to GetElementPtr creation.

This cleans up all GetElementPtr creation in LLVM to explicitly pass a
value type rather than deriving it from the pointer's element-type.

Differential Revision: https://reviews.llvm.org/D57173

llvm-svn: 352913

1 files changed, 4 insertions, 2 deletions

diff --git a/llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp b/llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp
index 263683041c1..eeeef58384d 100644
--- a/llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp
+++ b/llvm/lib/Transforms/Scalar/MemCpyOptimizer.cpp
@@ -1134,8 +1134,10 @@ bool MemCpyOptPass::processMemSetMemCpyDependence(MemCpyInst *MemCpy,
   Value *SizeDiff = Builder.CreateSub(DestSize, SrcSize);
   Value *MemsetLen = Builder.CreateSelect(
       Ule, ConstantInt::getNullValue(DestSize->getType()), SizeDiff);
-  Builder.CreateMemSet(Builder.CreateGEP(Dest, SrcSize), MemSet->getOperand(1),
-                       MemsetLen, Align);
+  Builder.CreateMemSet(
+      Builder.CreateGEP(Dest->getType()->getPointerElementType(), Dest,
+                        SrcSize),
+      MemSet->getOperand(1), MemsetLen, Align);
 
   MD->removeInstruction(MemSet);
   MemSet->eraseFromParent();