tighten up test3, add test3a for the converse

transform, which isn't happening yet.

llvm-svn: 84402

1 files changed, 22 insertions, 3 deletions

diff --git a/llvm/test/Analysis/BasicAA/modref.ll b/llvm/test/Analysis/BasicAA/modref.ll
index a089864271b..07d73a7dde7 100644
--- a/llvm/test/Analysis/BasicAA/modref.ll
+++ b/llvm/test/Analysis/BasicAA/modref.ll
@@ -51,7 +51,10 @@ define i8 @test2(i8* %P) {
 define i8 @test2a(i8* %P) {
 ; CHECK: @test2
   %P2 = getelementptr i8* %P, i32 126
+  
+  ;; FIXME: DSE isn't zapping this dead store.
   store i8 1, i8* %P2  ;; Dead, clobbered by memset.
+  
   call void @llvm.memset.i8(i8* %P, i8 2, i8 127, i32 0)
   %A = load i8* %P2
   ret i8 %A
@@ -59,14 +62,30 @@ define i8 @test2a(i8* %P) {
 ; CHECK: ret i8 %A
 }
 
-define void @test3(i8* %P) {
+define void @test3(i8* %P, i8 %X) {
 ; CHECK: @test3
+; CHECK-NOT: store
+; CHECK-NOT: %Y
+  %Y = add i8 %X, 1     ;; Dead, because the only use (the store) is dead.
+  
   %P2 = getelementptr i8* %P, i32 2
-  store i8 1, i8* %P2  ;; Not read by lifetime.end
-; CHECK: store
+  store i8 %Y, i8* %P2  ;; Not read by lifetime.end, should be removed.
+; CHECK: store i8 2, i8* %P2
   call void @llvm.lifetime.end(i64 1, i8* %P)
   store i8 2, i8* %P2
 ; CHECK-NOT: store
   ret void
 ; CHECK: ret void
+}
+
+define void @test3a(i8* %P, i8 %X) {
+; CHECK: @test3a
+  %Y = add i8 %X, 1     ;; Dead, because the only use (the store) is dead.
+  
+  %P2 = getelementptr i8* %P, i32 2
+  store i8 %Y, i8* %P2  ;; FIXME: Killed by llvm.lifetime.end, should be zapped.
+; CHECK: store i8 2, i8* %P2
+  call void @llvm.lifetime.end(i64 10, i8* %P)
+  ret void
+; CHECK: ret void
 }
\ No newline at end of file