[llvm] [LV] Don't create partial reductions if factor doesn't match accumulator (PR #158603)

[Sam Tebbs via llvm-commits]

================
@@ -1404,7 +1404,7 @@ define i32 @red_extended_add_chain(ptr %start, ptr %end, i32 %offset) {
 ; CHECK-NEON-NEXT:    [[NEXT_GEP:%.*]] = getelementptr i8, ptr [[START]], i64 [[INDEX]]
 ; CHECK-NEON-NEXT:    [[WIDE_LOAD:%.*]] = load <16 x i8>, ptr [[NEXT_GEP]], align 1
 ; CHECK-NEON-NEXT:    [[TMP3:%.*]] = zext <16 x i8> [[WIDE_LOAD]] to <16 x i32>
-; CHECK-NEON-NEXT:    [[PARTIAL_REDUCE:%.*]] = call <16 x i32> @llvm.experimental.vector.partial.reduce.add.v16i32.v16i32(<16 x i32> [[VEC_PHI]], <16 x i32> [[TMP3]])
+; CHECK-NEON-NEXT:    [[PARTIAL_REDUCE:%.*]] = add <16 x i32> [[VEC_PHI]], [[TMP3]]
----------------
SamTebbs33 wrote:

This test should probably be renamed now that it doesn't produce a partial reduction.

https://github.com/llvm/llvm-project/pull/158603