57 lines
2.2 KiB
Diff
57 lines
2.2 KiB
Diff
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From a820983749a2d3eebcc36b5a3ae34436fd52db45 Mon Sep 17 00:00:00 2001
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From: gubin <gubin_yewu@cmss.chinamobile.com>
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Date: Sat, 11 Jan 2025 10:54:33 +0800
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Subject: [PATCH] target/riscv/vector_helper.c: optimize loops in ldst helpers
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cherry-pick from 0a11629c915f61df798919db51a18ffe4649cb65
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Change the for loops in ldst helpers to do a single increment in the
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counter, and assign it env->vstart, to avoid re-reading from vstart
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every time.
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Suggested-by: Richard Henderson <richard.henderson@linaro.org>
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Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
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Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
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Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
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Message-ID: <20240314175704.478276-11-dbarboza@ventanamicro.com>
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Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
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Signed-off-by: gubin <gubin_yewu@cmss.chinamobile.com>
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---
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target/riscv/vector_helper.c | 6 +++---
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1 file changed, 3 insertions(+), 3 deletions(-)
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diff --git a/target/riscv/vector_helper.c b/target/riscv/vector_helper.c
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index 42ffd3a68a..b5acf81cc0 100644
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--- a/target/riscv/vector_helper.c
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+++ b/target/riscv/vector_helper.c
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@@ -196,7 +196,7 @@ vext_ldst_stride(void *vd, void *v0, target_ulong base,
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uint32_t esz = 1 << log2_esz;
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uint32_t vma = vext_vma(desc);
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- for (i = env->vstart; i < env->vl; i++, env->vstart++) {
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+ for (i = env->vstart; i < env->vl; env->vstart = ++i) {
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k = 0;
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while (k < nf) {
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if (!vm && !vext_elem_mask(v0, i)) {
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@@ -262,7 +262,7 @@ vext_ldst_us(void *vd, target_ulong base, CPURISCVState *env, uint32_t desc,
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uint32_t esz = 1 << log2_esz;
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/* load bytes from guest memory */
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- for (i = env->vstart; i < evl; i++, env->vstart++) {
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+ for (i = env->vstart; i < evl; env->vstart = ++i) {
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k = 0;
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while (k < nf) {
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target_ulong addr = base + ((i * nf + k) << log2_esz);
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@@ -376,7 +376,7 @@ vext_ldst_index(void *vd, void *v0, target_ulong base,
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uint32_t vma = vext_vma(desc);
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/* load bytes from guest memory */
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- for (i = env->vstart; i < env->vl; i++, env->vstart++) {
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+ for (i = env->vstart; i < env->vl; env->vstart = ++i) {
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k = 0;
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while (k < nf) {
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if (!vm && !vext_elem_mask(v0, i)) {
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--
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2.41.0.windows.1
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