new testcase globalopt should handle.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20351 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/GlobalOpt/memset.ll b/test/Transforms/GlobalOpt/memset.ll
new file mode 100644 (file)
index 0000000..442af98
--- /dev/null
+++ b/test/Transforms/GlobalOpt/memset.ll
@@ -0,0 +1,21 @@
+; RUN: llvm-as < %s | opt -globalopt | llvm-dis | not grep internal
+; both globals are write only, delete them.
+
+%G0 = internal global [58 x sbyte] c"asdlfkajsdlfkajsd;lfkajds;lfkjasd;flkajsd;lkfja;sdlkfjasd\00"
+
+%G1 = internal global [4 x int] [ int 1, int 2, int 3, int 4]
+
+implementation   ; Functions:
+
+declare void %llvm.memcpy(sbyte*, sbyte*, uint, uint)
+declare void %llvm.memset(sbyte*, ubyte, uint, uint)
+
+void %foo() {
+        %Blah = alloca [58 x sbyte]             ; <[58 x sbyte]*> [#uses=2]
+        %tmp3 = cast [58 x sbyte]* %Blah to sbyte*
+       call void %llvm.memcpy( sbyte* cast ([4 x int]* %G1 to sbyte*), sbyte* %tmp3, uint 16, uint 1)
+       call void %llvm.memset( sbyte* getelementptr ([58 x sbyte]* %G0, int 0, int 0), ubyte 17, uint 58, uint 1)
+       ret void
+}
+
+