Index: llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
===================================================================
--- llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
+++ llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
@@ -279,8 +279,7 @@
       Idx = Builder.CreateTrunc(Idx, IntPtrTy);
 
     unsigned ElementSize =
-    DL.getTypeAllocSize(Init->getType()->getArrayElementType());
-
+        DL.getTypeAllocSize(Init->getType()->getArrayElementType());
 
     // If inbounds keyword is not present, Idx * ElementSize can overflow.
     // Let's assume that ElementSize is 2 and the wanted value is at offset 0.
@@ -290,7 +289,7 @@
     // comparison is false if Idx was 0x80..00.
     // We need to erase the highest countTrailingZeros(ElementSize) bits of Idx.
     if (countTrailingZeros(ElementSize) != 0) {
-      Value *Mask = ConstantInt::get(Idx->getType(), -1);
+      Value *Mask = ConstantInt::getSigned(Idx->getType(), -1);
       Mask = Builder.CreateLShr(Mask, countTrailingZeros(ElementSize));
       Idx = Builder.CreateAnd(Idx, Mask);
     }