Fix PR1657

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42075 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 26 insertions, 0 deletions

diff --git a/test/Transforms/LICM/2007-09-17-PrompteValue.ll b/test/Transforms/LICM/2007-09-17-PrompteValue.ll
new file mode 100644
index 0000000..acbbabf
--- /dev/null
+++ b/test/Transforms/LICM/2007-09-17-PrompteValue.ll
@@ -0,0 +1,26 @@
+; 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
+}
+
+declare void @exit(i32)