fix PR12075, a regression in a recent transform I added. In unreachable code, gep chains can be infinite. Just like "stripPointerCasts", use a set to keep track of visited instructions so we don't recurse infinitely.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151383 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Transforms/InstSimplify/compare.ll b/test/Transforms/InstSimplify/compare.ll
index f22ac46..6ee6dfb 100644
--- a/test/Transforms/InstSimplify/compare.ll
+++ b/test/Transforms/InstSimplify/compare.ll
@@ -463,3 +463,13 @@
; CHECK: alloca_compare
; CHECK: ret i1 false
}
+
+; PR12075
+define i1 @infinite_gep() {
+ ret i1 1
+
+unreachableblock:
+ %X = getelementptr i32 *%X, i32 1
+ %Y = icmp eq i32* %X, null
+ ret i1 %Y
+}