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/*
* AArch64 SME translation
*
* Copyright (c) 2022 Linaro, Ltd
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "cpu.h"
#include "tcg/tcg-op.h"
#include "tcg/tcg-op-gvec.h"
#include "tcg/tcg-gvec-desc.h"
#include "translate.h"
#include "exec/helper-gen.h"
#include "translate-a64.h"
#include "fpu/softfloat.h"
/*
* Include the generated decoder.
*/
#include "decode-sme.c.inc"
/*
* Resolve tile.size[index] to a host pointer, where tile and index
* are always decoded together, dependent on the element size.
*/
static TCGv_ptr get_tile_rowcol(DisasContext *s, int esz, int rs,
int tile_index, bool vertical)
{
int tile = tile_index >> (4 - esz);
int index = esz == MO_128 ? 0 : extract32(tile_index, 0, 4 - esz);
int pos, len, offset;
TCGv_i32 tmp;
TCGv_ptr addr;
/* Compute the final index, which is Rs+imm. */
tmp = tcg_temp_new_i32();
tcg_gen_trunc_tl_i32(tmp, cpu_reg(s, rs));
tcg_gen_addi_i32(tmp, tmp, index);
/* Prepare a power-of-two modulo via extraction of @len bits. */
len = ctz32(streaming_vec_reg_size(s)) - esz;
if (vertical) {
/*
* Compute the byte offset of the index within the tile:
* (index % (svl / size)) * size
* = (index % (svl >> esz)) << esz
* Perform the power-of-two modulo via extraction of the low @len bits.
* Perform the multiply by shifting left by @pos bits.
* Perform these operations simultaneously via deposit into zero.
*/
pos = esz;
tcg_gen_deposit_z_i32(tmp, tmp, pos, len);
/*
* For big-endian, adjust the indexed column byte offset within
* the uint64_t host words that make up env->zarray[].
*/
if (HOST_BIG_ENDIAN && esz < MO_64) {
tcg_gen_xori_i32(tmp, tmp, 8 - (1 << esz));
}
} else {
/*
* Compute the byte offset of the index within the tile:
* (index % (svl / size)) * (size * sizeof(row))
* = (index % (svl >> esz)) << (esz + log2(sizeof(row)))
*/
pos = esz + ctz32(sizeof(ARMVectorReg));
tcg_gen_deposit_z_i32(tmp, tmp, pos, len);
/* Row slices are always aligned and need no endian adjustment. */
}
/* The tile byte offset within env->zarray is the row. */
offset = tile * sizeof(ARMVectorReg);
/* Include the byte offset of zarray to make this relative to env. */
offset += offsetof(CPUARMState, zarray);
tcg_gen_addi_i32(tmp, tmp, offset);
/* Add the byte offset to env to produce the final pointer. */
addr = tcg_temp_new_ptr();
tcg_gen_ext_i32_ptr(addr, tmp);
tcg_temp_free_i32(tmp);
tcg_gen_add_ptr(addr, addr, cpu_env);
return addr;
}
static bool trans_ZERO(DisasContext *s, arg_ZERO *a)
{
if (!dc_isar_feature(aa64_sme, s)) {
return false;
}
if (sme_za_enabled_check(s)) {
gen_helper_sme_zero(cpu_env, tcg_constant_i32(a->imm),
tcg_constant_i32(streaming_vec_reg_size(s)));
}
return true;
}
static bool trans_MOVA(DisasContext *s, arg_MOVA *a)
{
static gen_helper_gvec_4 * const h_fns[5] = {
gen_helper_sve_sel_zpzz_b, gen_helper_sve_sel_zpzz_h,
gen_helper_sve_sel_zpzz_s, gen_helper_sve_sel_zpzz_d,
gen_helper_sve_sel_zpzz_q
};
static gen_helper_gvec_3 * const cz_fns[5] = {
gen_helper_sme_mova_cz_b, gen_helper_sme_mova_cz_h,
gen_helper_sme_mova_cz_s, gen_helper_sme_mova_cz_d,
gen_helper_sme_mova_cz_q,
};
static gen_helper_gvec_3 * const zc_fns[5] = {
gen_helper_sme_mova_zc_b, gen_helper_sme_mova_zc_h,
gen_helper_sme_mova_zc_s, gen_helper_sme_mova_zc_d,
gen_helper_sme_mova_zc_q,
};
TCGv_ptr t_za, t_zr, t_pg;
TCGv_i32 t_desc;
int svl;
if (!dc_isar_feature(aa64_sme, s)) {
return false;
}
if (!sme_smza_enabled_check(s)) {
return true;
}
t_za = get_tile_rowcol(s, a->esz, a->rs, a->za_imm, a->v);
t_zr = vec_full_reg_ptr(s, a->zr);
t_pg = pred_full_reg_ptr(s, a->pg);
svl = streaming_vec_reg_size(s);
t_desc = tcg_constant_i32(simd_desc(svl, svl, 0));
if (a->v) {
/* Vertical slice -- use sme mova helpers. */
if (a->to_vec) {
zc_fns[a->esz](t_zr, t_za, t_pg, t_desc);
} else {
cz_fns[a->esz](t_za, t_zr, t_pg, t_desc);
}
} else {
/* Horizontal slice -- reuse sve sel helpers. */
if (a->to_vec) {
h_fns[a->esz](t_zr, t_za, t_zr, t_pg, t_desc);
} else {
h_fns[a->esz](t_za, t_zr, t_za, t_pg, t_desc);
}
}
tcg_temp_free_ptr(t_za);
tcg_temp_free_ptr(t_zr);
tcg_temp_free_ptr(t_pg);
return true;
}
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