[llvm] [LV] Add initial support for partial alias masking (PR #177599)

[Florian Hahn via llvm-commits]

================
@@ -479,12 +479,12 @@ define void @print_expand_scev(i64 %y, ptr %ptr) {
 ; CHECK-NEXT:  Live-in vp<[[VP2:%[0-9]+]]> = vector-trip-count
 ; CHECK-NEXT:  vp<[[VP3:%[0-9]+]]> = original trip-count
 ; CHECK-EMPTY:
-; CHECK-NEXT:  ir-bb<entry>:
-; CHECK-NEXT:    IR   %div = udiv i64 %y, 492802768830814060
-; CHECK-NEXT:    IR   %inc = add i64 %div, 1
-; CHECK-NEXT:    EMIT vp<[[VP3]]> = EXPAND SCEV (1 + ((15 + (%y /u 492802768830814060))<nuw><nsw> /u (1 + (%y /u 492802768830814060))<nuw><nsw>))<nuw><nsw>
-; CHECK-NEXT:    EMIT vp<[[VP4:%[0-9]+]]> = EXPAND SCEV (1 + (%y /u 492802768830814060))<nuw><nsw>
-; CHECK-NEXT:  Successor(s): scalar.ph, vector.ph
+; CHECK-NEXT: ir-bb<entry>:
+; CHECK-NEXT:   EMIT vp<[[VP4:%.+]]> = EXPAND SCEV (1 + (%y /u 492802768830814060))<nuw><nsw>
+; CHECK-NEXT:   EMIT vp<[[VP3]]> = EXPAND SCEV (1 + ((15 + (%y /u 492802768830814060))<nuw><nsw> /u (1 + (%y /u 492802768830814060))<nuw><nsw>))<nuw><nsw>
+; CHECK-NEXT:   IR   %div = udiv i64 %y, 492802768830814060
+; CHECK-NEXT:   IR   %inc = add i64 %div, 1
+; CHECK-NEXT: Successor(s): scalar.ph, vector.ph
----------------
fhahn wrote:

This looks a bit odd, would be good to keep VPIRInstructions  first if possible, to be consistent with codegen, which I think places the recipes after the VPIRInstructions

https://github.com/llvm/llvm-project/pull/177599