Reviewed-by: Frank Chang <frank.ch...@sifive.com>
On Wed, Feb 22, 2023 at 2:46 AM Daniel Henrique Barboza <
dbarb...@ventanamicro.com> wrote:
> Commit 752614cab8e6 ("target/riscv: rvv: Add tail agnostic for vector
> load / store instructions") added code to set the tail elements to 1 in
> the end of vext_ldst_stride(), vext_ldst_us(), vext_ldst_index() and
> vext_ldff(). Aside from a env->vl versus an evl value being used in the
> first loop, the code is being repeated 4 times.
>
> Create a helper to avoid code repetition in all those functions.
> Arguments that are used in the callers (nf, esz and max_elems) are
> passed as arguments. All other values are being derived inside the
> helper.
>
> Signed-off-by: Daniel Henrique Barboza <dbarb...@ventanamicro.com>
> ---
> target/riscv/vector_helper.c | 86 +++++++++++++-----------------------
> 1 file changed, 30 insertions(+), 56 deletions(-)
>
> diff --git a/target/riscv/vector_helper.c b/target/riscv/vector_helper.c
> index 00de879787..7d2e3978f1 100644
> --- a/target/riscv/vector_helper.c
> +++ b/target/riscv/vector_helper.c
> @@ -267,6 +267,28 @@ GEN_VEXT_ST_ELEM(ste_h, int16_t, H2, stw)
> GEN_VEXT_ST_ELEM(ste_w, int32_t, H4, stl)
> GEN_VEXT_ST_ELEM(ste_d, int64_t, H8, stq)
>
> +static void vext_set_tail_elems_1s(CPURISCVState *env, target_ulong vl,
> + void *vd, uint32_t desc, uint32_t nf,
> + uint32_t esz, uint32_t max_elems)
> +{
> + uint32_t total_elems = vext_get_total_elems(env, desc, esz);
> + uint32_t vlenb = env_archcpu(env)->cfg.vlen >> 3;
> + uint32_t vta = vext_vta(desc);
> + uint32_t registers_used;
> + int k;
> +
> + for (k = 0; k < nf; ++k) {
> + vext_set_elems_1s(vd, vta, (k * max_elems + vl) * esz,
> + (k * max_elems + max_elems) * esz);
> + }
> +
> + if (nf * max_elems % total_elems != 0) {
> + registers_used = ((nf * max_elems) * esz + (vlenb - 1)) / vlenb;
> + vext_set_elems_1s(vd, vta, (nf * max_elems) * esz,
> + registers_used * vlenb);
> + }
> +}
> +
> /*
> *** stride: access vector element from strided memory
> */
> @@ -281,8 +303,6 @@ vext_ldst_stride(void *vd, void *v0, target_ulong base,
> uint32_t nf = vext_nf(desc);
> uint32_t max_elems = vext_max_elems(desc, log2_esz);
> uint32_t esz = 1 << log2_esz;
> - uint32_t total_elems = vext_get_total_elems(env, desc, esz);
> - uint32_t vta = vext_vta(desc);
> uint32_t vma = vext_vma(desc);
>
> for (i = env->vstart; i < env->vl; i++, env->vstart++) {
> @@ -301,18 +321,8 @@ vext_ldst_stride(void *vd, void *v0, target_ulong
> base,
> }
> }
> env->vstart = 0;
> - /* set tail elements to 1s */
> - for (k = 0; k < nf; ++k) {
> - vext_set_elems_1s(vd, vta, (k * max_elems + env->vl) * esz,
> - (k * max_elems + max_elems) * esz);
> - }
> - if (nf * max_elems % total_elems != 0) {
> - uint32_t vlenb = env_archcpu(env)->cfg.vlen >> 3;
> - uint32_t registers_used =
> - ((nf * max_elems) * esz + (vlenb - 1)) / vlenb;
> - vext_set_elems_1s(vd, vta, (nf * max_elems) * esz,
> - registers_used * vlenb);
> - }
> +
> + vext_set_tail_elems_1s(env, env->vl, vd, desc, nf, esz, max_elems);
> }
>
> #define GEN_VEXT_LD_STRIDE(NAME, ETYPE, LOAD_FN) \
> @@ -359,8 +369,6 @@ vext_ldst_us(void *vd, target_ulong base,
> CPURISCVState *env, uint32_t desc,
> uint32_t nf = vext_nf(desc);
> uint32_t max_elems = vext_max_elems(desc, log2_esz);
> uint32_t esz = 1 << log2_esz;
> - uint32_t total_elems = vext_get_total_elems(env, desc, esz);
> - uint32_t vta = vext_vta(desc);
>
> /* load bytes from guest memory */
> for (i = env->vstart; i < evl; i++, env->vstart++) {
> @@ -372,18 +380,8 @@ vext_ldst_us(void *vd, target_ulong base,
> CPURISCVState *env, uint32_t desc,
> }
> }
> env->vstart = 0;
> - /* set tail elements to 1s */
> - for (k = 0; k < nf; ++k) {
> - vext_set_elems_1s(vd, vta, (k * max_elems + evl) * esz,
> - (k * max_elems + max_elems) * esz);
> - }
> - if (nf * max_elems % total_elems != 0) {
> - uint32_t vlenb = env_archcpu(env)->cfg.vlen >> 3;
> - uint32_t registers_used =
> - ((nf * max_elems) * esz + (vlenb - 1)) / vlenb;
> - vext_set_elems_1s(vd, vta, (nf * max_elems) * esz,
> - registers_used * vlenb);
> - }
> +
> + vext_set_tail_elems_1s(env, evl, vd, desc, nf, esz, max_elems);
> }
>
> /*
> @@ -484,8 +482,6 @@ vext_ldst_index(void *vd, void *v0, target_ulong base,
> uint32_t vm = vext_vm(desc);
> uint32_t max_elems = vext_max_elems(desc, log2_esz);
> uint32_t esz = 1 << log2_esz;
> - uint32_t total_elems = vext_get_total_elems(env, desc, esz);
> - uint32_t vta = vext_vta(desc);
> uint32_t vma = vext_vma(desc);
>
> /* load bytes from guest memory */
> @@ -505,18 +501,8 @@ vext_ldst_index(void *vd, void *v0, target_ulong base,
> }
> }
> env->vstart = 0;
> - /* set tail elements to 1s */
> - for (k = 0; k < nf; ++k) {
> - vext_set_elems_1s(vd, vta, (k * max_elems + env->vl) * esz,
> - (k * max_elems + max_elems) * esz);
> - }
> - if (nf * max_elems % total_elems != 0) {
> - uint32_t vlenb = env_archcpu(env)->cfg.vlen >> 3;
> - uint32_t registers_used =
> - ((nf * max_elems) * esz + (vlenb - 1)) / vlenb;
> - vext_set_elems_1s(vd, vta, (nf * max_elems) * esz,
> - registers_used * vlenb);
> - }
> +
> + vext_set_tail_elems_1s(env, env->vl, vd, desc, nf, esz, max_elems);
> }
>
> #define GEN_VEXT_LD_INDEX(NAME, ETYPE, INDEX_FN, LOAD_FN)
> \
> @@ -585,8 +571,6 @@ vext_ldff(void *vd, void *v0, target_ulong base,
> uint32_t vm = vext_vm(desc);
> uint32_t max_elems = vext_max_elems(desc, log2_esz);
> uint32_t esz = 1 << log2_esz;
> - uint32_t total_elems = vext_get_total_elems(env, desc, esz);
> - uint32_t vta = vext_vta(desc);
> uint32_t vma = vext_vma(desc);
> target_ulong addr, offset, remain;
>
> @@ -647,18 +631,8 @@ ProbeSuccess:
> }
> }
> env->vstart = 0;
> - /* set tail elements to 1s */
> - for (k = 0; k < nf; ++k) {
> - vext_set_elems_1s(vd, vta, (k * max_elems + env->vl) * esz,
> - (k * max_elems + max_elems) * esz);
> - }
> - if (nf * max_elems % total_elems != 0) {
> - uint32_t vlenb = env_archcpu(env)->cfg.vlen >> 3;
> - uint32_t registers_used =
> - ((nf * max_elems) * esz + (vlenb - 1)) / vlenb;
> - vext_set_elems_1s(vd, vta, (nf * max_elems) * esz,
> - registers_used * vlenb);
> - }
> +
> + vext_set_tail_elems_1s(env, env->vl, vd, desc, nf, esz, max_elems);
> }
>
> #define GEN_VEXT_LDFF(NAME, ETYPE, LOAD_FN) \
> --
> 2.39.2
>
>
>
