1 files changed, 61 insertions, 0 deletions
diff --git a/test/Transforms/LICM/2007-09-17-PromoteValue.ll b/test/Transforms/LICM/2007-09-17-PromoteValue.ll
new file mode 100644
index 000000000000..e9ba9e16318f
--- /dev/null
+++ b/test/Transforms/LICM/2007-09-17-PromoteValue.ll
@@ -0,0 +1,61 @@
+; ModuleID = 'PR1657.bc'
+; Do not promote getelementptr because it may exposes load from a null pointer 
+; and store from a null pointer  which are covered by 
+; icmp eq %struct.decision* null, null condition.
+; RUN: llvm-as < %s | opt -licm | llvm-dis | not grep promoted
+	%struct.decision = type { i8, %struct.decision* }
+
+define i32 @main() {
+entry:
+	br label %blah.i
+
+blah.i:		; preds = %cond_true.i, %entry
+	%tmp3.i = icmp eq %struct.decision* null, null		; <i1> [#uses=1]
+	br i1 %tmp3.i, label %clear_modes.exit, label %cond_true.i
+
+cond_true.i:		; preds = %blah.i
+	%tmp1.i = getelementptr %struct.decision* null, i32 0, i32 0		; <i8*> [#uses=1]
+	store i8 0, i8* %tmp1.i
+	br label %blah.i
+
+clear_modes.exit:		; preds = %blah.i
+	call void @exit( i32 0 )
+	unreachable
+}
+
+define i32 @f(i8* %ptr) {
+entry:
+        br label %loop.head
+
+loop.head:              ; preds = %cond.true, %entry
+        %x = phi i8* [ %ptr, %entry ], [ %ptr.i, %cond.true ]           ; <i8*> [#uses=1]
+        %tmp3.i = icmp ne i8* %ptr, %x          ; <i1> [#uses=1]
+        br i1 %tmp3.i, label %cond.true, label %exit
+
+cond.true:              ; preds = %loop.head
+        %ptr.i = getelementptr i8* %ptr, i32 0          ; <i8*> [#uses=2]
+        store i8 0, i8* %ptr.i
+        br label %loop.head
+
+exit:           ; preds = %loop.head
+        ret i32 0
+}
+
+define i32 @f2(i8* %p, i8* %q) {
+entry:
+        br label %loop.head
+
+loop.head:              ; preds = %cond.true, %entry
+        %tmp3.i = icmp eq i8* null, %q            ; <i1> [#uses=1]
+        br i1 %tmp3.i, label %exit, label %cond.true
+
+cond.true:              ; preds = %loop.head
+        %ptr.i = getelementptr i8* %p, i32 0          ; <i8*> [#uses=2]
+        store i8 0, i8* %ptr.i
+        br label %loop.head
+
+exit:           ; preds = %loop.head
+        ret i32 0
+}
+
+declare void @exit(i32)