Regression is gone, don't try to find it on clean target.

llvm-svn: 33296

1 files changed, 23 insertions, 0 deletions

diff --git a/llvm/test/Analysis/GlobalsModRef/purecse.ll b/llvm/test/Analysis/GlobalsModRef/purecse.ll
new file mode 100644
index 00000000000..0c95182d46d
--- /dev/null
+++ b/llvm/test/Analysis/GlobalsModRef/purecse.ll
@@ -0,0 +1,23 @@
+; Test that pure functions are cse'd away
+
+; RUN: llvm-upgrade < %s | llvm-as | opt -globalsmodref-aa -load-vn -gcse -instcombine | llvm-dis | not grep sub
+
+int %pure(int %X) {
+	%Y = add int %X, 1
+	ret int %Y
+}
+
+int %test1(int %X) {
+	%A = call int %pure(int %X)
+	%B = call int %pure(int %X)
+	%C = sub int %A, %B
+	ret int %C
+}
+
+int %test2(int %X, int* %P) {
+	%A = call int %pure(int %X)
+	store int %X, int* %P          ;; Does not invalidate 'pure' call.
+	%B = call int %pure(int %X)
+	%C = sub int %A, %B
+	ret int %C
+}