[BasicAA] Add extra onevscale test for multiple dependent geps that lose the NSW flag. NFC

Author: davemgreen

llvm/test/Analysis/BasicAA/vscale.ll

@@ -458,11 +458,29 @@ define void @vscale_v1v2types(ptr %p) {
   ret void
 }
 
+; CHECK-LABEL: onevscale
+; CHECK-DAG:   MustAlias:    <vscale x 4 x i32>* %vp161, <vscale x 4 x i32>* %vp162
+; CHECK-DAG:   MayAlias:     <vscale x 4 x i32>* %vp161, <vscale x 4 x i32>* %vp161b
+; CHECK-DAG:   MayAlias:     <vscale x 4 x i32>* %vp161b, <vscale x 4 x i32>* %vp162
+define void @onevscale(ptr %p) vscale_range(1,16) {
+  %v1 = call i64 @llvm.vscale.i64()
+  %vp1 = mul nsw i64 %v1, 16
+  %vp2 = mul nsw i64 %v1, 16
+  %vp3 = mul nsw i64 %v1, 17
+  %vp161 = getelementptr i8, ptr %p, i64 %vp1
+  %vp162 = getelementptr i8, ptr %p, i64 %vp2
+  %vp161b = getelementptr i8, ptr %vp161, i64 %vp3
+  load <vscale x 4 x i32>, ptr %vp161
+  load <vscale x 4 x i32>, ptr %vp162
+  load <vscale x 4 x i32>, ptr %vp161b
+  ret void
+}
+
 ; CHECK-LABEL: twovscales
 ; CHECK-DAG:   MayAlias:     <vscale x 4 x i32>* %vp161, <vscale x 4 x i32>* %vp162
 ; CHECK-DAG:   MayAlias:     <vscale x 4 x i32>* %vp161, <vscale x 4 x i32>* %vp161b
 ; CHECK-DAG:   MayAlias:     <vscale x 4 x i32>* %vp161b, <vscale x 4 x i32>* %vp162
-define void @twovscales(ptr %p) {
+define void @twovscales(ptr %p) vscale_range(1,16) {
   %v1 = call i64 @llvm.vscale.i64()
   %v2 = call i64 @llvm.vscale.i64()
   %vp1 = mul nsw i64 %v1, 16