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target/riscv/vector_helper.c: optimize loops in ldst helpers

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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>
(cherry picked from commit 0a11629c91)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
Daniel Henrique Barboza 2024-03-14 14:57:04 -03:00 • committed by Michael Tokarev
parent c4ed8c5610
commit b7ff2c5600
1 changed files with 3 additions and 3 deletions
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6
target/riscv/vector_helper.c
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@ -198,7 +198,7 @@ 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)) {
@ -266,7 +266,7 @@ 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);
@ -382,7 +382,7 @@ 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)) {