1 files changed, 54 insertions, 0 deletions
diff --git a/test/Analysis/BasicAA/noalias-geps.ll b/test/Analysis/BasicAA/noalias-geps.ll
new file mode 100644
index 0000000..a93d778
--- /dev/null
+++ b/test/Analysis/BasicAA/noalias-geps.ll
@@ -0,0 +1,54 @@
+; RUN: opt < %s -basicaa -aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
+
+target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
+
+; Check that geps with equal base offsets of noalias base pointers stay noalias.
+define i32 @test(i32* %p, i16 %i) {
+  %pi = getelementptr i32* %p, i32 0
+  %pi.next = getelementptr i32* %p, i32 1
+  %b = icmp eq i16 %i, 0
+  br i1 %b, label %bb1, label %bb2
+
+bb1:
+  %f = getelementptr i32* %pi, i32 1
+  %g = getelementptr i32* %pi.next, i32 1
+  br label %bb3
+bb2:
+  %f2 = getelementptr i32* %pi, i32 1
+  %g2 = getelementptr i32* %pi.next, i32 1
+  br label %bb3
+
+bb3:
+  %ptr_phi = phi i32* [ %f, %bb1 ], [ %f2, %bb2 ]
+  %ptr_phi2 = phi i32* [ %g, %bb1 ], [ %g2, %bb2 ]
+; CHECK: NoAlias: i32* %f1, i32* %g1
+  %f1 = getelementptr i32* %ptr_phi , i32 1
+  %g1 = getelementptr i32* %ptr_phi2 , i32 1
+
+ret i32 0
+}
+
+; Check that geps with equal indices of noalias base pointers stay noalias.
+define i32 @test2([2 x i32]* %p, i32 %i) {
+  %pi = getelementptr [2 x i32]* %p, i32 0
+  %pi.next = getelementptr [2 x i32]* %p, i32 1
+  %b = icmp eq i32 %i, 0
+  br i1 %b, label %bb1, label %bb2
+
+bb1:
+  %f = getelementptr [2 x i32]* %pi, i32 1
+  %g = getelementptr [2 x i32]* %pi.next, i32 1
+  br label %bb3
+bb2:
+  %f2 = getelementptr [2 x i32]* %pi, i32 1
+  %g2 = getelementptr [2 x i32]* %pi.next, i32 1
+  br label %bb3
+bb3:
+  %ptr_phi = phi [2 x i32]* [ %f, %bb1 ], [ %f2, %bb2 ]
+  %ptr_phi2 = phi [2 x i32]* [ %g, %bb1 ], [ %g2, %bb2 ]
+; CHECK: NoAlias: i32* %f1, i32* %g1
+  %f1 = getelementptr [2 x i32]* %ptr_phi , i32 1, i32 %i
+  %g1 = getelementptr [2 x i32]* %ptr_phi2 , i32 1, i32 %i
+
+ret i32 0
+}