[llvm] [LV] Bundle (partial) reductions with a mul of a constant (PR #162503)

[Florian Hahn via llvm-commits]

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@@ -800,3 +800,545 @@ exit:
   %r.0.lcssa = phi i64 [ %rdx.next, %loop ]
   ret i64 %r.0.lcssa
 }
+
+define i32 @print_mulacc_extended_const(ptr %start, ptr %end) {
+; CHECK-LABEL: 'print_mulacc_extended_const'
+; CHECK:       VPlan 'Initial VPlan for VF={4},UF>=1' {
+; CHECK-NEXT:  Live-in vp<%0> = VF
+; CHECK-NEXT:  Live-in vp<%1> = VF * UF
+; CHECK-NEXT:  Live-in vp<%2> = vector-trip-count
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fhahn wrote:

would be good to use variables here, some for other vp<> values, to make the test easier to maintain down the line

https://github.com/llvm/llvm-project/pull/162503