[llvm] [LoopVectorizer] Prune VFs based on plan register pressure (PR #132190)

[Sam Tebbs via llvm-commits]

================
@@ -44,7 +44,7 @@ define void @test() {
 ; AVX2:  LV: Found an estimated cost of 4 for VF 4 For instruction: store i64 %valB, ptr %out, align 8
 ; AVX2:  LV: Found an estimated cost of 9 for VF 8 For instruction: store i64 %valB, ptr %out, align 8
 ; AVX2:  LV: Found an estimated cost of 18 for VF 16 For instruction: store i64 %valB, ptr %out, align 8
-; AVX2:  LV: Found an estimated cost of 36 for VF 32 For instruction: store i64 %valB, ptr %out, align 8
+; AVX2-NOFAST: LV: Found an estimated cost of 36 for VF 32 For instruction: store i64 %valB, ptr %out, align 8
----------------
SamTebbs33 wrote:

That's covered by the AVX2 checks.

https://github.com/llvm/llvm-project/pull/132190