--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/CodeGen/ARM/2009-08-04-RegScavengerAssert.ll	Thu Dec 12 13:56:28 2013 +0900
@@ -0,0 +1,25 @@
+; RUN: llc < %s -mtriple=arm-linux-gnueabi
+; PR4528
+
+define i32 @file_read_actor(i32 %desc, i32 %page, i32 %offset, i32 %size) nounwind optsize {
+entry:
+	br i1 undef, label %fault_in_pages_writeable.exit, label %bb5.i
+
+bb5.i:		; preds = %entry
+	%asmtmp.i = tail call i32 asm sideeffect "1:\09strbt\09$1,[$2]\0A2:\0A\09.section .fixup,\22ax\22\0A\09.align\092\0A3:\09mov\09$0, $3\0A\09b\092b\0A\09.previous\0A\09.section __ex_table,\22a\22\0A\09.align\093\0A\09.long\091b, 3b\0A\09.previous", "=r,r,r,i,0,~{cc}"(i8 0, i32 undef, i32 -14, i32 0) nounwind		; <i32> [#uses=1]
+	br label %fault_in_pages_writeable.exit
+
+fault_in_pages_writeable.exit:		; preds = %bb5.i, %entry
+	%0 = phi i32 [ 0, %entry ], [ %asmtmp.i, %bb5.i ]		; <i32> [#uses=1]
+	%1 = icmp eq i32 %0, 0		; <i1> [#uses=1]
+	br i1 %1, label %bb2, label %bb3
+
+bb2:		; preds = %fault_in_pages_writeable.exit
+	unreachable
+
+bb3:		; preds = %fault_in_pages_writeable.exit
+	%2 = tail call  i32 @__copy_to_user(i8* undef, i8* undef, i32 undef) nounwind		; <i32> [#uses=0]
+	unreachable
+}
+
+declare i32 @__copy_to_user(i8*, i8*, i32)