[llvm] [LoopVectorize][NFC] Rewrite tests to check output of vplan cost model (PR #113697)

[David Sherwood via llvm-commits]

================
@@ -1,54 +1,59 @@
 ; REQUIRES: asserts
 ; RUN: opt -mtriple=aarch64 -mattr=+sve \
 ; RUN:     -force-target-instruction-cost=1 -passes=loop-vectorize -S -debug-only=loop-vectorize < %s 2>&1 \
-; RUN:     | FileCheck %s --check-prefixes=GENERIC,VF-VSCALE4
+; RUN:     | FileCheck %s --check-prefixes=GENERIC,VF-VSCALE16
 
 ; RUN: opt -mtriple=aarch64 -mattr=+sve -mcpu=generic \
 ; RUN:     -force-target-instruction-cost=1 -passes=loop-vectorize -S -debug-only=loop-vectorize < %s 2>&1 \
-; RUN:     | FileCheck %s --check-prefixes=GENERIC,VF-VSCALE4
+; RUN:     | FileCheck %s --check-prefixes=GENERIC,VF-VSCALE16
 
 ; RUN: opt -mtriple=aarch64 -mcpu=neoverse-v1 \
 ; RUN:     -force-target-instruction-cost=1 -passes=loop-vectorize -S -debug-only=loop-vectorize < %s 2>&1 \
-; RUN:     | FileCheck %s --check-prefixes=NEOVERSE-V1,VF-VSCALE4
+; RUN:     | FileCheck %s --check-prefixes=NEOVERSE-V1,VF-VSCALE16
 
 ; RUN: opt -mtriple=aarch64 -mcpu=neoverse-n2 \
 ; RUN:     -force-target-instruction-cost=1 -passes=loop-vectorize -S -debug-only=loop-vectorize < %s 2>&1 \
-; RUN:     | FileCheck %s --check-prefixes=NEOVERSE-N2,VF-VSCALE4
+; RUN:     | FileCheck %s --check-prefixes=NEOVERSE-N2,VF-VSCALE16
 
-; RUN: opt -mtriple=aarch64 -mcpu=neoverse-n2 \
+; RUN: opt -mtriple=aarch64 -mcpu=neoverse-v2 \
 ; RUN:     -force-target-instruction-cost=1 -passes=loop-vectorize -S -debug-only=loop-vectorize < %s 2>&1 \
-; RUN:     | FileCheck %s --check-prefixes=NEOVERSE-N2,VF-VSCALE4
+; RUN:     | FileCheck %s --check-prefixes=NEOVERSE-V2,VF-16
+
+; GENERIC: Cost for VF vscale x 2: 11
+; GENERIC: Cost for VF vscale x 4: 11
+; GENERIC: LV: Selecting VF: vscale x 16
 
-; GENERIC: LV: Vector loop of width vscale x 2 costs: 3 (assuming a minimum vscale of 2).
-; GENERIC: LV: Vector loop of width vscale x 4 costs: 1 (assuming a minimum vscale of 2).
+; NEOVERSE-V1: Cost for VF vscale x 2: 11
+; NEOVERSE-V1: Cost for VF vscale x 4: 11
+; NEOVERSE-V1: LV: Selecting VF: vscale x 16
 
-; NEOVERSE-V1: LV: Vector loop of width vscale x 2 costs: 3 (assuming a minimum vscale of 2).
-; NEOVERSE-V1: LV: Vector loop of width vscale x 4 costs: 1 (assuming a minimum vscale of 2).
+; NEOVERSE-N2: Cost for VF vscale x 2: 11
+; NEOVERSE-N2: Cost for VF vscale x 4: 11
+; NEOVERSE-N2: LV: Selecting VF: vscale x 16
 
-; NEOVERSE-N2: LV: Vector loop of width vscale x 2 costs: 6 (assuming a minimum vscale of 1).
-; NEOVERSE-N2: LV: Vector loop of width vscale x 4 costs: 3 (assuming a minimum vscale of 1).
+; NEOVERSE-V2: Cost for VF vscale x 2: 11
+; NEOVERSE-V2: Cost for VF vscale x 4: 11
+; NEOVERSE-V2: LV: Selecting VF: 16
 
-; VF-4: <4 x i32>
-; VF-VSCALE4: <16 x i32>
+; VF-16: <16 x i8>
+; VF-VSCALE16: <vscale x 16 x i8>
----------------
david-arm wrote:

I've added more debug output from the vectoriser showing the cost per lane to make it clearer. I think this will be generally useful information for the user.

https://github.com/llvm/llvm-project/pull/113697