tighten test2, add a test that it doesn't get transformed in the invalid edge case.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84401 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Analysis/BasicAA/modref.ll b/test/Analysis/BasicAA/modref.ll
index b3d93acf55e6d457f8fd43e350b1c9c9fa8f9341..a089864271b7320e22b2131fd5ff1c39cfd320c6 100644 (file)
--- a/test/Analysis/BasicAA/modref.ll
+++ b/test/Analysis/BasicAA/modref.ll
@@ -40,7 +40,7 @@ define i8 @test1() {
 
 define i8 @test2(i8* %P) {
 ; CHECK: @test2
-  %P2 = getelementptr i8* %P, i32 1000
+  %P2 = getelementptr i8* %P, i32 127
   store i8 1, i8* %P2  ;; Not dead across memset
   call void @llvm.memset.i8(i8* %P, i8 2, i8 127, i32 0)
   %A = load i8* %P2
@@ -48,6 +48,17 @@ define i8 @test2(i8* %P) {
 ; CHECK: ret i8 1
 }
 
+define i8 @test2a(i8* %P) {
+; CHECK: @test2
+  %P2 = getelementptr i8* %P, i32 126
+  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
+; CHECK: %A = load i8* %P2
+; CHECK: ret i8 %A
+}
+
 define void @test3(i8* %P) {
 ; CHECK: @test3
   %P2 = getelementptr i8* %P, i32 2