diff --git a/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp b/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
index d27f1071d67..c8556638cec 100644
--- a/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
+++ b/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
@@ -640,7 +640,7 @@ static bool isObjectSizeLessThanOrEq(Value *V, uint64_t MaxSize,
     }
 
     if (GlobalAlias *GA = dyn_cast<GlobalAlias>(P)) {
-      if (!GA->isInterposable())
+      if (GA->isInterposable())
         return false;
       Worklist.push_back(GA->getAliasee());
       continue;
diff --git a/test/Transforms/InstCombine/mem-gep-zidx.ll b/test/Transforms/InstCombine/mem-gep-zidx.ll
index cf021b13370..4499051b255 100644
--- a/test/Transforms/InstCombine/mem-gep-zidx.ll
+++ b/test/Transforms/InstCombine/mem-gep-zidx.ll
@@ -4,6 +4,7 @@ target triple = "powerpc64-unknown-linux-gnu"
 
 @f.a = private unnamed_addr constant [1 x i32] [i32 12], align 4
 @f.b = private unnamed_addr constant [1 x i32] [i32 55], align 4
+@f.c = linkonce unnamed_addr alias [1 x i32], [1 x i32]* @f.b
 
 define signext i32 @test1(i32 signext %x) #0 {
 entry:
@@ -44,5 +45,16 @@ entry:
 ; CHECK: getelementptr inbounds [1 x i32], [1 x i32]* %p, i64 0, i64 0
 }
 
+define signext i32 @test4(i32 signext %x, i1 %y) #0 {
+entry:
+  %idxprom = sext i32 %x to i64
+  %arrayidx = getelementptr inbounds [1 x i32], [1 x i32]* @f.c, i64 0, i64 %idxprom
+  %0 = load i32, i32* %arrayidx, align 4
+  ret i32 %0
+
+; CHECK-LABEL: @test4
+; CHECK: getelementptr inbounds [1 x i32], [1 x i32]* @f.c, i64 0, i64 %idxprom
+}
+
 attributes #0 = { nounwind readnone }