1 /*
2  * RISC-V Vector Extension Internals
3  *
4  * Copyright (c) 2020 T-Head Semiconductor Co., Ltd. All rights reserved.
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms and conditions of the GNU General Public License,
8  * version 2 or later, as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope it will be useful, but WITHOUT
11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
13  * more details.
14  *
15  * You should have received a copy of the GNU General Public License along with
16  * this program.  If not, see <http://www.gnu.org/licenses/>.
17  */
18 
19 #include "qemu/osdep.h"
20 #include "vector_internals.h"
21 
22 /* set agnostic elements to 1s */
23 void vext_set_elems_1s(void *base, uint32_t is_agnostic, uint32_t cnt,
24                        uint32_t tot)
25 {
26     if (is_agnostic == 0) {
27         /* policy undisturbed */
28         return;
29     }
30     if (tot - cnt == 0) {
31         return ;
32     }
33     memset(base + cnt, -1, tot - cnt);
34 }
35 
36 void do_vext_vv(void *vd, void *v0, void *vs1, void *vs2,
37                 CPURISCVState *env, uint32_t desc,
38                 opivv2_fn *fn, uint32_t esz)
39 {
40     uint32_t vm = vext_vm(desc);
41     uint32_t vl = env->vl;
42     uint32_t total_elems = vext_get_total_elems(env, desc, esz);
43     uint32_t vta = vext_vta(desc);
44     uint32_t vma = vext_vma(desc);
45     uint32_t i;
46 
47     VSTART_CHECK_EARLY_EXIT(env);
48 
49     for (i = env->vstart; i < vl; i++) {
50         if (!vm && !vext_elem_mask(v0, i)) {
51             /* set masked-off elements to 1s */
52             vext_set_elems_1s(vd, vma, i * esz, (i + 1) * esz);
53             continue;
54         }
55         fn(vd, vs1, vs2, i);
56     }
57     env->vstart = 0;
58     /* set tail elements to 1s */
59     vext_set_elems_1s(vd, vta, vl * esz, total_elems * esz);
60 }
61 
62 void do_vext_vx(void *vd, void *v0, target_long s1, void *vs2,
63                 CPURISCVState *env, uint32_t desc,
64                 opivx2_fn fn, uint32_t esz)
65 {
66     uint32_t vm = vext_vm(desc);
67     uint32_t vl = env->vl;
68     uint32_t total_elems = vext_get_total_elems(env, desc, esz);
69     uint32_t vta = vext_vta(desc);
70     uint32_t vma = vext_vma(desc);
71     uint32_t i;
72 
73     VSTART_CHECK_EARLY_EXIT(env);
74 
75     for (i = env->vstart; i < vl; i++) {
76         if (!vm && !vext_elem_mask(v0, i)) {
77             /* set masked-off elements to 1s */
78             vext_set_elems_1s(vd, vma, i * esz, (i + 1) * esz);
79             continue;
80         }
81         fn(vd, s1, vs2, i);
82     }
83     env->vstart = 0;
84     /* set tail elements to 1s */
85     vext_set_elems_1s(vd, vta, vl * esz, total_elems * esz);
86 }
87