1 files changed, 21 insertions, 0 deletions
diff --git a/llvm/test/Transforms/EarlyCSE/basic.ll b/llvm/test/Transforms/EarlyCSE/basic.ll
new file mode 100644
index 00000000000..d42f503fc64
--- /dev/null
+++ b/llvm/test/Transforms/EarlyCSE/basic.ll
@@ -0,0 +1,21 @@
+; RUN: opt < %s -S -early-cse | FileCheck %s
+
+
+; CHECK: @test1
+define void @test1(i8 %V, i32 *%P) {
+  %A = bitcast i64 42 to double  ;; dead
+  %B = add i32 4, 19             ;; constant folds
+  store i32 %B, i32* %P
+  
+  ; CHECK-NEXT: store i32 23, i32* %P
+  
+  %C = zext i8 %V to i32
+  %D = zext i8 %V to i32  ;; CSE
+  volatile store i32 %C, i32* %P
+  volatile store i32 %D, i32* %P
+  
+  ; CHECK-NEXT: %C = zext i8 %V to i32
+  ; CHECK-NEXT: volatile store i32 %C
+  ; CHECK-NEXT: volatile store i32 %C
+  ret void
+}