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-rw-r--r--test/Analysis/BasicAA/interprocedural.ll42
1 files changed, 42 insertions, 0 deletions
diff --git a/test/Analysis/BasicAA/interprocedural.ll b/test/Analysis/BasicAA/interprocedural.ll
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--- /dev/null
+++ b/test/Analysis/BasicAA/interprocedural.ll
@@ -0,0 +1,42 @@
+; RUN: opt -interprocedural-basic-aa -interprocedural-aa-eval -print-all-alias-modref-info -disable-output < %s |& FileCheck %s
+
+; The noalias attribute is not safe in an interprocedural context.
+; CHECK: MayAlias: i8* %p, i8* %q
+
+define void @t0(i8* noalias %p) {
+ store i8 0, i8* %p
+ ret void
+}
+define void @t1(i8* noalias %q) {
+ store i8 0, i8* %q
+ ret void
+}
+
+; An alloca can alias an argument in a different function.
+; CHECK: MayAlias: i32* %r, i32* %s
+
+define void @s0(i32* %r) {
+ store i32 0, i32* %r
+ ret void
+}
+
+define void @s1() {
+ %s = alloca i32, i32 10
+ store i32 0, i32* %s
+ call void @s0(i32* %s)
+ ret void
+}
+
+; An alloca can alias an argument in a recursive function.
+; CHECK: MayAlias: i64* %t, i64* %u
+; CHECK: MayAlias: i64* %u, i64* %v
+; CHECK: MayAlias: i64* %t, i64* %v
+
+define i64* @r0(i64* %u) {
+ %t = alloca i64, i32 10
+ %v = call i64* @r0(i64* %t)
+ store i64 0, i64* %t
+ store i64 0, i64* %u
+ store i64 0, i64* %v
+ ret i64* %t
+}