[llvm] [VPlan] Explicitly replicate VPInstructions by VF. (PR #155102)

[Florian Hahn via llvm-commits]

================
@@ -22,7 +22,11 @@ define void @switch4_default_common_dest_with_case(ptr %start, ptr %end) {
 ; CHECK-NEXT: vector.body:
 ; CHECK-NEXT:   EMIT-SCALAR vp<[[CAN_IV:%.+]]> = phi [ ir<0>, vector.ph ], [ vp<[[CAN_IV_NEXT:%.+]]>, default.2 ]
 ; CHECK-NEXT:   vp<[[STEPS:%.+]]> = SCALAR-STEPS vp<[[CAN_IV]]>, ir<1>, ir<2>
-; CHECK-NEXT:   EMIT vp<[[PTR:%.+]]> = ptradd ir<%start>, vp<[[STEPS]]>
+; CHECK-NEXT:   EMIT vp<[[STEP1:%.+]]> = extractelement vp<[[STEPS]]>, ir<0>
+; CHECK-NEXT:   EMIT vp<[[PTR:%.+]]> = ptradd ir<%start>, vp<[[STEP1]]>
+; CHECK-NEXT:   EMIT vp<[[STEP2:%.+]]> = extractelement vp<[[STEPS]]>, ir<1>
+; CHECK-NEXT:   EMIT vp<[[PTR]]>.1 = ptradd ir<%start>, vp<[[STEP2]]>
+; CHECK-NEXT:   EMIT vp<[[PTR_VEC:%.+]]> = buildvector vp<[[PTR]]>, vp<[[PTR]]>.1
----------------
fhahn wrote:

Included in the TODO for `replicateByVF`

https://github.com/llvm/llvm-project/pull/155102