[llvm] [LV] Support argmin/argmax with strict predicates. (PR #170223)

[via llvm-commits]

================
@@ -408,15 +408,15 @@ exit:
 define i64 @test_vectorize_select_smin_first_idx_non_canonical_wide_iv(ptr %src) {
 ; CHECK-LABEL: define i64 @test_vectorize_select_smin_first_idx_non_canonical_wide_iv(
 ; CHECK-SAME: ptr [[SRC:%.*]]) {
-; CHECK-NEXT:  [[ENTRY:.*:]]
-; CHECK-NEXT:    br label %[[VECTOR_PH:.*]]
-; CHECK:       [[VECTOR_PH]]:
+; CHECK-NEXT:  [[VECTOR_PH:.*:]]
 ; CHECK-NEXT:    br label %[[VECTOR_BODY:.*]]
 ; CHECK:       [[VECTOR_BODY]]:
-; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
-; CHECK-NEXT:    [[VEC_IND:%.*]] = phi <4 x i64> [ <i64 0, i64 1, i64 2, i64 3>, %[[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], %[[VECTOR_BODY]] ]
-; CHECK-NEXT:    [[VEC_PHI:%.*]] = phi <4 x i64> [ splat (i64 -1), %[[VECTOR_PH]] ], [ [[TMP3:%.*]], %[[VECTOR_BODY]] ]
-; CHECK-NEXT:    [[VEC_PHI1:%.*]] = phi <4 x i64> [ zeroinitializer, %[[VECTOR_PH]] ], [ [[TMP2:%.*]], %[[VECTOR_BODY]] ]
+; CHECK-NEXT:    br label %[[VECTOR_BODY1:.*]]
+; CHECK:       [[VECTOR_BODY1]]:
----------------
ayalz wrote:

Introduced but redundant?

https://github.com/llvm/llvm-project/pull/170223