diff options
Diffstat (limited to 'test/Analysis/BasicAA/modref.ll')
| -rw-r--r-- | test/Analysis/BasicAA/modref.ll | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/test/Analysis/BasicAA/modref.ll b/test/Analysis/BasicAA/modref.ll index e124d6cbe20f..3084f809c370 100644 --- a/test/Analysis/BasicAA/modref.ll +++ b/test/Analysis/BasicAA/modref.ll @@ -145,6 +145,51 @@ entry: ; CHECK: load i32, i32* } +;; Check that aa correctly handles functions marked with argmemonly +;; attribute. +declare i32 @func_argmemonly(i32 * %P) argmemonly + +;; Can not remove redundant load, function may write to it. +; CHECK-LABEL: @test8( +define i32 @test8(i32 *%P) { + %V1 = load i32, i32* %P + call i32 @func_argmemonly(i32* %P) + %V2 = load i32, i32* %P + %Diff = sub i32 %V1, %V2 + ret i32 %Diff + ; CHECK: load + ; CHECK: load + ; CHECK: sub + ; CHECK: ret i32 %Diff +} + +;; In this case load can be removed, function clobbers only %P2. +; CHECK-LABEL: @test9( +define i32 @test9(i32* %P, i32* noalias %P2) { + %V1 = load i32, i32* %P + call i32 @func_argmemonly(i32* %P2) + %V2 = load i32, i32* %P + %Diff = sub i32 %V1, %V2 + ret i32 %Diff + ; CHECK-NOT: load + ; CHECK: ret i32 0 +} + +;; In this case load can *not* be removed. Function clobers only %P2 but it may +;; alias with %P. +; CHECK-LABEL: @test10( +define i32 @test10(i32* %P, i32* %P2) { + %V1 = load i32, i32* %P + call i32 @func_argmemonly(i32* %P2) + %V2 = load i32, i32* %P + %Diff = sub i32 %V1, %V2 + ret i32 %Diff + ; CHECK: load + ; CHECK: load + ; CHECK: sub + ; CHECK: ret i32 %Diff +} + declare void @llvm.memset.p0i8.i32(i8* nocapture, i8, i32, i32, i1) nounwind declare void @llvm.memset.p0i8.i8(i8* nocapture, i8, i8, i32, i1) nounwind declare void @llvm.memcpy.p0i8.p0i8.i8(i8* nocapture, i8* nocapture, i8, i32, i1) nounwind |