[llvm] [LV] Vectorize conditional scalar assignments (PR #158088)

[Benjamin Maxwell via llvm-commits]

================
@@ -688,20 +688,51 @@ define i32 @not_vectorized_select_icmp_const_truncated_iv_unwidened_exit(ptr %a,
 ; CHECK-VF4IC1-NEXT:    [[CMP_SGT:%.*]] = icmp sgt i64 [[N]], 0
 ; CHECK-VF4IC1-NEXT:    br i1 [[CMP_SGT]], label %[[FOR_BODY_PREHEADER:.*]], label %[[EXIT:.*]]
 ; CHECK-VF4IC1:       [[FOR_BODY_PREHEADER]]:
+; CHECK-VF4IC1-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[N]], 4
----------------
MacDue wrote:

Another intended negative test.

https://github.com/llvm/llvm-project/pull/158088