[llvm] CostModel/RISCV: add test for ctpop, with/without ZVBB (PR #67013)

[Ramkumar Ramachandra via llvm-commits]

https://github.com/artagnon updated https://github.com/llvm/llvm-project/pull/67013

>From e32999b4846bb40c1700c312f577f033a610d4a9 Mon Sep 17 00:00:00 2001
From: Ramkumar Ramachandra <Ramkumar.Ramachandra at imgtec.com>
Date: Thu, 21 Sep 2023 13:30:27 +0100
Subject: [PATCH] CostModel/RISCV: tweak test for ctpop, with/without ZVBB

Vector ctpop only exists under ZVBB, but ZVBB is unaccounted for in the
cost-model of ctpop. Document this defect with an additional RUN line in
the test for ctpop, showing identical costs with/without ZVBB. A
follow-up patch could fix this defect.
---
 llvm/test/Analysis/CostModel/RISCV/int-bit-manip.ll | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/llvm/test/Analysis/CostModel/RISCV/int-bit-manip.ll b/llvm/test/Analysis/CostModel/RISCV/int-bit-manip.ll
index 393e924022da746..103c2e0d813a2ca 100644
--- a/llvm/test/Analysis/CostModel/RISCV/int-bit-manip.ll
+++ b/llvm/test/Analysis/CostModel/RISCV/int-bit-manip.ll
@@ -1,5 +1,7 @@
 ; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
-; RUN: opt < %s -passes="print<cost-model>" 2>&1 -disable-output -S -mtriple=riscv64 -mattr=+v,+f,+d -riscv-v-vector-bits-min=-1 | FileCheck %s
+; RUN: opt < %s -passes="print<cost-model>" 2>&1 -disable-output -S -mtriple=riscv64 -mattr=+v,+f,+d -riscv-v-vector-bits-min=-1 | FileCheck %s --check-prefixes=CHECK,NOZVBB
+; Vector ctpop exists only under ZVBB
+; RUN: opt < %s -passes="print<cost-model>" 2>&1 -disable-output -S -mtriple=riscv64 -mattr=+v,+f,+d,+experimental-zvbb -riscv-v-vector-bits-min=-1 | FileCheck %s --check-prefixes=CHECK,ZVBB
 
 define void @bswap() {
 ; CHECK-LABEL: 'bswap'
@@ -849,3 +851,6 @@ declare <vscale x 2 x i64> @llvm.vp.cttz.nvx2i64(<vscale x 2 x i64>, i1 immarg,
 declare <vscale x 4 x i64> @llvm.vp.cttz.nvx4i64(<vscale x 4 x i64>, i1 immarg, <vscale x 4 x i1>, i32)
 declare <vscale x 8 x i64> @llvm.vp.cttz.nvx8i64(<vscale x 8 x i64>, i1 immarg, <vscale x 8 x i1>, i32)
 declare <vscale x 16 x i64> @llvm.vp.cttz.nvx16i64(<vscale x 16 x i64>, i1 immarg, <vscale x 16 x i1>, i32)
+;; NOTE: These prefixes are unused and the list is autogenerated. Do not add tests below this line:
+; NOZVBB: {{.*}}
+; ZVBB: {{.*}}