LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Greentime Hu <greentime.hu@sifive.com>
To: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
	aou@eecs.berkeley.edu, palmer@dabbelt.com,
	paul.walmsley@sifive.com, vincent.chen@sifive.com
Subject: [RFC PATCH v8 17/21] riscv: Optimize vector registers initialization
Date: Thu,  9 Sep 2021 01:45:29 +0800	[thread overview]
Message-ID: <e742a1ac4028694a85800d0966a9ab0c9fc1c1fe.1631121222.git.greentime.hu@sifive.com> (raw)
In-Reply-To: <cover.1631121222.git.greentime.hu@sifive.com>

This patch optimizes the initialization or invalidation of vector
registers. It can reduce the code sizes of vector_flush_cpu_state()
and reset_regs().

Co-developed-by: Han-Kuan Chen <hankuan.chen@sifive.com>
Signed-off-by: Han-Kuan Chen <hankuan.chen@sifive.com>
Signed-off-by: Greentime Hu <greentime.hu@sifive.com>
---
 arch/riscv/kernel/head.S               | 30 +-----------------------
 arch/riscv/kernel/kernel_mode_vector.c | 32 ++------------------------
 2 files changed, 3 insertions(+), 59 deletions(-)

diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S
index 42eb3203fa77..8362d7458c6c 100644
--- a/arch/riscv/kernel/head.S
+++ b/arch/riscv/kernel/head.S
@@ -442,39 +442,11 @@ ENTRY(reset_regs)
 
 	li	t1, SR_VS
 	csrs	CSR_STATUS, t1
-	vsetvli t1, x0, e8, m1
+	vsetvli t1, x0, e8, m8
 	vmv.v.i v0, 0
-	vmv.v.i v1, 0
-	vmv.v.i v2, 0
-	vmv.v.i v3, 0
-	vmv.v.i v4, 0
-	vmv.v.i v5, 0
-	vmv.v.i v6, 0
-	vmv.v.i v7, 0
 	vmv.v.i v8, 0
-	vmv.v.i v9, 0
-	vmv.v.i v10, 0
-	vmv.v.i v11, 0
-	vmv.v.i v12, 0
-	vmv.v.i v13, 0
-	vmv.v.i v14, 0
-	vmv.v.i v15, 0
 	vmv.v.i v16, 0
-	vmv.v.i v17, 0
-	vmv.v.i v18, 0
-	vmv.v.i v19, 0
-	vmv.v.i v20, 0
-	vmv.v.i v21, 0
-	vmv.v.i v22, 0
-	vmv.v.i v23, 0
 	vmv.v.i v24, 0
-	vmv.v.i v25, 0
-	vmv.v.i v26, 0
-	vmv.v.i v27, 0
-	vmv.v.i v28, 0
-	vmv.v.i v29, 0
-	vmv.v.i v30, 0
-	vmv.v.i v31, 0
 	/* note that the caller must clear SR_VS */
 #endif /* CONFIG_VECTOR */
 
diff --git a/arch/riscv/kernel/kernel_mode_vector.c b/arch/riscv/kernel/kernel_mode_vector.c
index 108cfafe7496..b84618630edf 100644
--- a/arch/riscv/kernel/kernel_mode_vector.c
+++ b/arch/riscv/kernel/kernel_mode_vector.c
@@ -86,39 +86,11 @@ static void vector_flush_cpu_state(void)
 	long tmp;
 
 	__asm__ __volatile__ (
-		"vsetvli %0, x0, e8, m1\n"
+		"vsetvli %0, x0, e8, m8\n"
 		"vmv.v.i v0, 0\n"
-		"vmv.v.i v1, 0\n"
-		"vmv.v.i v2, 0\n"
-		"vmv.v.i v3, 0\n"
-		"vmv.v.i v4, 0\n"
-		"vmv.v.i v5, 0\n"
-		"vmv.v.i v6, 0\n"
-		"vmv.v.i v7, 0\n"
 		"vmv.v.i v8, 0\n"
-		"vmv.v.i v9, 0\n"
-		"vmv.v.i v10, 0\n"
-		"vmv.v.i v11, 0\n"
-		"vmv.v.i v12, 0\n"
-		"vmv.v.i v13, 0\n"
-		"vmv.v.i v14, 0\n"
-		"vmv.v.i v15, 0\n"
 		"vmv.v.i v16, 0\n"
-		"vmv.v.i v17, 0\n"
-		"vmv.v.i v18, 0\n"
-		"vmv.v.i v19, 0\n"
-		"vmv.v.i v20, 0\n"
-		"vmv.v.i v21, 0\n"
-		"vmv.v.i v22, 0\n"
-		"vmv.v.i v23, 0\n"
-		"vmv.v.i v24, 0\n"
-		"vmv.v.i v25, 0\n"
-		"vmv.v.i v26, 0\n"
-		"vmv.v.i v27, 0\n"
-		"vmv.v.i v28, 0\n"
-		"vmv.v.i v29, 0\n"
-		"vmv.v.i v30, 0\n"
-		"vmv.v.i v31, 0\n":"=r"(tmp)::);
+		"vmv.v.i v24, 0\n":"=r"(tmp)::);
 }
 
 /*
-- 
2.31.1


  parent reply	other threads:[~2021-09-08 17:46 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-08 17:45 [RFC PATCH v8 00/21] riscv: Add vector ISA support Greentime Hu
2021-09-08 17:45 ` [RFC PATCH v8 01/21] riscv: Separate patch for cflags and aflags Greentime Hu
2021-09-08 17:45 ` [RFC PATCH v8 02/21] riscv: Rename __switch_to_aux -> fpu Greentime Hu
2021-09-08 17:45 ` [RFC PATCH v8 03/21] riscv: Extending cpufeature.c to detect V-extension Greentime Hu
2021-09-08 17:45 ` [RFC PATCH v8 04/21] riscv: Add new csr defines related to vector extension Greentime Hu
2021-09-08 17:45 ` [RFC PATCH v8 05/21] riscv: Add vector feature to compile Greentime Hu
2021-09-08 17:45 ` [RFC PATCH v8 06/21] riscv: Add has_vector/riscv_vsize to save vector features Greentime Hu
2021-09-08 17:45 ` [RFC PATCH v8 07/21] riscv: Reset vector register Greentime Hu
2021-09-08 17:45 ` [RFC PATCH v8 08/21] riscv: Add vector struct and assembler definitions Greentime Hu
2021-09-08 17:45 ` [RFC PATCH v8 09/21] riscv: Add task switch support for vector Greentime Hu
2021-09-13 12:21   ` Darius Rad
2021-09-28 14:56     ` Greentime Hu
2021-09-29 13:28       ` Darius Rad
2021-10-01  2:46         ` Ley Foon Tan
2021-10-04 12:41           ` Greentime Hu
2021-10-05  2:12             ` Ley Foon Tan
2021-10-05 15:46               ` Greentime Hu
2021-10-07 10:10                 ` Ley Foon Tan
2021-10-04 12:36         ` Greentime Hu
2021-10-05 13:57           ` Darius Rad
2021-10-21  1:01             ` Paul Walmsley
2021-10-21 10:50               ` Darius Rad
2021-10-22  3:52                 ` Vincent Chen
2021-10-22 10:40                   ` Darius Rad
2021-10-25  4:47                     ` Greentime Hu
2021-10-25 16:22                       ` Darius Rad
2021-10-26  4:44                         ` Greentime Hu
2021-10-27 12:58                           ` Darius Rad
2021-11-09  9:49                             ` Greentime Hu
2021-11-09 19:21                               ` Darius Rad
2021-10-26 14:58                     ` Heiko Stübner
2021-09-08 17:45 ` [RFC PATCH v8 10/21] riscv: Add ptrace vector support Greentime Hu
2021-09-08 17:45 ` [RFC PATCH v8 11/21] riscv: Add sigcontext save/restore for vector Greentime Hu
2021-09-30  2:37   ` Ley Foon Tan
2021-09-08 17:45 ` [RFC PATCH v8 12/21] riscv: signal: Report signal frame size to userspace via auxv Greentime Hu
2021-09-08 17:45 ` [RFC PATCH v8 13/21] riscv: Add support for kernel mode vector Greentime Hu
2021-09-09  6:17   ` Christoph Hellwig
2021-09-08 17:45 ` [RFC PATCH v8 14/21] riscv: Use CSR_STATUS to replace sstatus in vector.S Greentime Hu
2021-09-08 17:45 ` [RFC PATCH v8 15/21] riscv: Add vector extension XOR implementation Greentime Hu
2021-09-09  6:12   ` Christoph Hellwig
2021-09-28  7:00     ` Greentime Hu
2021-09-14  8:29   ` Ley Foon Tan
2021-09-28  7:01     ` Greentime Hu
2021-09-08 17:45 ` [RFC PATCH v8 16/21] riscv: Initialize vector registers with proper vsetvli then it can work normally Greentime Hu
2021-09-08 17:45 ` Greentime Hu [this message]
2021-09-08 17:45 ` [RFC PATCH v8 18/21] riscv: Fix an illegal instruction exception when accessing vlenb without enable vector first Greentime Hu
2021-09-08 17:45 ` [RFC PATCH v8 19/21] riscv: Allocate space for vector registers in start_thread() Greentime Hu
2021-09-08 17:45 ` [RFC PATCH v8 20/21] riscv: Optimize task switch codes of vector Greentime Hu
2021-09-15 14:29   ` Jisheng Zhang
2021-10-04 14:13     ` Greentime Hu
2021-09-08 17:45 ` [RFC PATCH v8 21/21] riscv: Turn has_vector into a static key if VECTOR=y Greentime Hu
2021-09-15 14:24   ` Jisheng Zhang
2021-10-04 15:04     ` Greentime Hu
2021-09-13  1:47 ` [RFC PATCH v8 00/21] riscv: Add vector ISA support Vincent Chen
2021-09-13 17:18 ` Vineet Gupta

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=e742a1ac4028694a85800d0966a9ab0c9fc1c1fe.1631121222.git.greentime.hu@sifive.com \
    --to=greentime.hu@sifive.com \
    --cc=aou@eecs.berkeley.edu \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-riscv@lists.infradead.org \
    --cc=palmer@dabbelt.com \
    --cc=paul.walmsley@sifive.com \
    --cc=vincent.chen@sifive.com \
    --subject='Re: [RFC PATCH v8 17/21] riscv: Optimize vector registers initialization' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).