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From: Craig Blackmore <craig.blackmore@embecosm.com>
To: qemu-devel@nongnu.org,
qemu-riscv@nongnu.org
Cc: Craig Blackmore <craig.blackmore@embecosm.com>,
Richard Henderson <richard.henderson@linaro.org>,
Palmer Dabbelt <palmer@dabbelt.com>,
Alistair Francis <alistair.francis@wdc.com>, Bin Meng <bmeng.cn@gmail.com>,
Weiwei Li <liwei1518@gmail.com>,
Daniel Henrique Barboza <dbarboza@ventanamicro.com>,
Liu Zhiwei <zhiwei_liu@linux.alibaba.com>,
Helene Chelin <helene.chelin@embecosm.com>, Nathan Egge <negge@google.com>,
Max Chou <max.chou@sifive.com>, Paolo Savini <paolo.savini@embecosm.com>
Subject: [PATCH v8 2/2] target/riscv: rvv: speed up small unit-stride loads
and stores
Date: Wed, 18 Dec 2024 14:23:53 +0000
Message-ID: <20241218142353.1027938-3-craig.blackmore@embecosm.com>
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Calling `vext_continuous_ldst_tlb` for load/stores up to 6 bytes
significantly improves performance.
Co-authored-by: Helene CHELIN <helene.chelin@embecosm.com>
Co-authored-by: Paolo Savini <paolo.savini@embecosm.com>
Co-authored-by: Craig Blackmore <craig.blackmore@embecosm.com>
Signed-off-by: Helene CHELIN <helene.chelin@embecosm.com>
Signed-off-by: Paolo Savini <paolo.savini@embecosm.com>
Signed-off-by: Craig Blackmore <craig.blackmore@embecosm.com>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
target/riscv/vector_helper.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/target/riscv/vector_helper.c b/target/riscv/vector_helper.c
index 0f57e48cc5..ead3ec5194 100644
--- a/target/riscv/vector_helper.c
+++ b/target/riscv/vector_helper.c
@@ -393,6 +393,22 @@ vext_ldst_us(void *vd, target_ulong base, CPURISCVStat=
e *env, uint32_t desc,
return;
}
=20
+#if defined(CONFIG_USER_ONLY)
+ /*
+ * For data sizes <=3D 6 bytes we get better performance by simply cal=
ling
+ * vext_continuous_ldst_tlb
+ */
+ if (nf =3D=3D 1 && (evl << log2_esz) <=3D 6) {
+ addr =3D base + (env->vstart << log2_esz);
+ vext_continuous_ldst_tlb(env, ldst_tlb, vd, evl, addr, env->vstart=
, ra,
+ esz, is_load);
+
+ env->vstart =3D 0;
+ vext_set_tail_elems_1s(evl, vd, desc, nf, esz, max_elems);
+ return;
+ }
+#endif
+
/* Calculate the page range of first page */
addr =3D base + ((env->vstart * nf) << log2_esz);
page_split =3D -(addr | TARGET_PAGE_MASK);
--=20
2.43.0