Use right address space size in InstCombineCompares

The test's output doesn't change, but this ensures
this is actually hit with a different address space.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191701 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 3 deletions

diff --git a/lib/Transforms/InstCombine/InstCombineCompares.cpp b/lib/Transforms/InstCombine/InstCombineCompares.cpp
index f691350fed..e624572e04 100644
--- a/lib/Transforms/InstCombine/InstCombineCompares.cpp
+++ b/lib/Transforms/InstCombine/InstCombineCompares.cpp
@@ -394,9 +394,12 @@ FoldCmpLoadFromIndexedGlobal(GetElementPtrInst *GEP, GlobalVariable *GV,
   // If the index is larger than the pointer size of the target, truncate the
   // index down like the GEP would do implicitly.  We don't have to do this for
   // an inbounds GEP because the index can't be out of range.
-  if (!GEP->isInBounds() &&
-      Idx->getType()->getPrimitiveSizeInBits() > TD->getPointerSizeInBits())
-    Idx = Builder->CreateTrunc(Idx, TD->getIntPtrType(Idx->getContext()));
+  if (!GEP->isInBounds()) {
+    Type *IntPtrTy = TD->getIntPtrType(GEP->getType());
+    unsigned PtrSize = IntPtrTy->getIntegerBitWidth();
+    if (Idx->getType()->getPrimitiveSizeInBits() > PtrSize)
+      Idx = Builder->CreateTrunc(Idx, IntPtrTy);
+  }
 
   // If the comparison is only true for one or two elements, emit direct
   // comparisons.