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From: Alistair Francis <alistair23@gmail.com>
To: qemu-devel@nongnu.org
Cc: alistair23@gmail.com,
	Daniel Henrique Barboza <dbarboza@ventanamicro.com>,
	Richard Henderson <richard.henderson@linaro.org>,
	Alistair Francis <alistair.francis@wdc.com>
Subject: [PULL 11/15] target/riscv/vector_helper.c: optimize loops in ldst helpers
Date: Fri, 22 Mar 2024 18:53:15 +1000	[thread overview]
Message-ID: <20240322085319.1758843-12-alistair.francis@wdc.com> (raw)
In-Reply-To: <20240322085319.1758843-1-alistair.francis@wdc.com>

From: Daniel Henrique Barboza <dbarboza@ventanamicro.com>

Change the for loops in ldst helpers to do a single increment in the
counter, and assign it env->vstart, to avoid re-reading from vstart
every time.

Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20240314175704.478276-11-dbarboza@ventanamicro.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
---
 target/riscv/vector_helper.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/target/riscv/vector_helper.c b/target/riscv/vector_helper.c
index 63a1083f03..fa139040f8 100644
--- a/target/riscv/vector_helper.c
+++ b/target/riscv/vector_helper.c
@@ -209,7 +209,7 @@ vext_ldst_stride(void *vd, void *v0, target_ulong base,
 
     VSTART_CHECK_EARLY_EXIT(env);
 
-    for (i = env->vstart; i < env->vl; i++, env->vstart++) {
+    for (i = env->vstart; i < env->vl; env->vstart = ++i) {
         k = 0;
         while (k < nf) {
             if (!vm && !vext_elem_mask(v0, i)) {
@@ -277,7 +277,7 @@ vext_ldst_us(void *vd, target_ulong base, CPURISCVState *env, uint32_t desc,
     VSTART_CHECK_EARLY_EXIT(env);
 
     /* load bytes from guest memory */
-    for (i = env->vstart; i < evl; i++, env->vstart++) {
+    for (i = env->vstart; i < evl; env->vstart = ++i) {
         k = 0;
         while (k < nf) {
             target_ulong addr = base + ((i * nf + k) << log2_esz);
@@ -393,7 +393,7 @@ vext_ldst_index(void *vd, void *v0, target_ulong base,
     VSTART_CHECK_EARLY_EXIT(env);
 
     /* load bytes from guest memory */
-    for (i = env->vstart; i < env->vl; i++, env->vstart++) {
+    for (i = env->vstart; i < env->vl; env->vstart = ++i) {
         k = 0;
         while (k < nf) {
             if (!vm && !vext_elem_mask(v0, i)) {
-- 
2.44.0



  parent reply	other threads:[~2024-03-22  9:01 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-03-22  8:53 [PULL 00/15] riscv-to-apply queue Alistair Francis
2024-03-22  8:53 ` [PULL 01/15] target/riscv: do not enable all named features by default Alistair Francis
2024-03-22  8:53 ` [PULL 02/15] target/riscv/vector_helper.c: set vstart = 0 in GEN_VEXT_VSLIDEUP_VX() Alistair Francis
2024-03-22  8:53 ` [PULL 03/15] trans_rvv.c.inc: set vstart = 0 in int scalar move insns Alistair Francis
2024-03-22  8:53 ` [PULL 04/15] target/riscv/vector_helper.c: fix 'vmvr_v' memcpy endianess Alistair Francis
2024-03-22  8:53 ` [PULL 05/15] target/riscv: always clear vstart in whole vec move insns Alistair Francis
2024-03-22  8:53 ` [PULL 06/15] target/riscv: always clear vstart for ldst_whole insns Alistair Francis
2024-03-22  8:53 ` [PULL 07/15] target/riscv/vector_helpers: do early exit when vstart >= vl Alistair Francis
2024-03-22  8:53 ` [PULL 08/15] target/riscv: remove 'over' brconds from vector trans Alistair Francis
2024-03-22  8:53 ` [PULL 09/15] trans_rvv.c.inc: remove redundant mark_vs_dirty() calls Alistair Francis
2024-03-22  8:53 ` [PULL 10/15] target/riscv: enable 'vstart_eq_zero' in the end of insns Alistair Francis
2024-03-22  8:53 ` Alistair Francis [this message]
2024-03-22  8:53 ` [PULL 12/15] hw/intc: Update APLIC IDC after claiming iforce register Alistair Francis
2024-03-22  8:53 ` [PULL 13/15] target/riscv: rvv: Remove the dependency of Zvfbfmin to Zfbfmin Alistair Francis
2024-03-22  8:53 ` [PULL 14/15] target/riscv: Fix mode in riscv_tlb_fill Alistair Francis
2024-03-22  8:53 ` [PULL 15/15] target/riscv/kvm: fix timebase-frequency when using KVM acceleration Alistair Francis
2024-03-22 12:58 ` [PULL 00/15] riscv-to-apply queue Peter Maydell
2024-03-22 17:16 ` Michael Tokarev
2024-03-22 19:46   ` Daniel Henrique Barboza
2024-03-24 15:07     ` Michael Tokarev
2024-03-24 18:12       ` Daniel Henrique Barboza
2024-03-26  9:53         ` Michael Tokarev
2024-03-26  9:56           ` Alistair Francis
2024-03-26 12:09             ` Daniel Henrique Barboza
2024-03-27 10:13             ` Michael Tokarev

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