1 /*
2 * RISC-V Bitmanip Extension Helpers for QEMU.
3 *
4 * Copyright (c) 2020 Kito Cheng, kito.cheng@sifive.com
5 * Copyright (c) 2020 Frank Chang, frank.chang@sifive.com
6 * Copyright (c) 2021 Philipp Tomsich, philipp.tomsich@vrull.eu
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms and conditions of the GNU General Public License,
10 * version 2 or later, as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * more details.
16 *
17 * You should have received a copy of the GNU General Public License along with
18 * this program. If not, see <http://www.gnu.org/licenses/>.
19 */
20
21 #include "qemu/osdep.h"
22 #include "qemu/host-utils.h"
23 #include "exec/exec-all.h"
24 #include "exec/helper-proto.h"
25 #include "tcg/tcg.h"
26
HELPER(clmul)27 target_ulong HELPER(clmul)(target_ulong rs1, target_ulong rs2)
28 {
29 target_ulong result = 0;
30
31 for (int i = 0; i < TARGET_LONG_BITS; i++) {
32 if ((rs2 >> i) & 1) {
33 result ^= (rs1 << i);
34 }
35 }
36
37 return result;
38 }
39
HELPER(clmulr)40 target_ulong HELPER(clmulr)(target_ulong rs1, target_ulong rs2)
41 {
42 target_ulong result = 0;
43
44 for (int i = 0; i < TARGET_LONG_BITS; i++) {
45 if ((rs2 >> i) & 1) {
46 result ^= (rs1 >> (TARGET_LONG_BITS - i - 1));
47 }
48 }
49
50 return result;
51 }
52
do_swap(target_ulong x,uint64_t mask,int shift)53 static inline target_ulong do_swap(target_ulong x, uint64_t mask, int shift)
54 {
55 return ((x & mask) << shift) | ((x & ~mask) >> shift);
56 }
57
HELPER(brev8)58 target_ulong HELPER(brev8)(target_ulong rs1)
59 {
60 target_ulong x = rs1;
61
62 x = do_swap(x, 0x5555555555555555ull, 1);
63 x = do_swap(x, 0x3333333333333333ull, 2);
64 x = do_swap(x, 0x0f0f0f0f0f0f0f0full, 4);
65 return x;
66 }
67
68 static const uint64_t shuf_masks[] = {
69 dup_const(MO_8, 0x44),
70 dup_const(MO_8, 0x30),
71 dup_const(MO_16, 0x0f00),
72 dup_const(MO_32, 0xff0000)
73 };
74
do_shuf_stage(target_ulong src,uint64_t maskL,uint64_t maskR,int shift)75 static inline target_ulong do_shuf_stage(target_ulong src, uint64_t maskL,
76 uint64_t maskR, int shift)
77 {
78 target_ulong x = src & ~(maskL | maskR);
79
80 x |= ((src << shift) & maskL) | ((src >> shift) & maskR);
81 return x;
82 }
83
HELPER(unzip)84 target_ulong HELPER(unzip)(target_ulong rs1)
85 {
86 target_ulong x = rs1;
87
88 x = do_shuf_stage(x, shuf_masks[0], shuf_masks[0] >> 1, 1);
89 x = do_shuf_stage(x, shuf_masks[1], shuf_masks[1] >> 2, 2);
90 x = do_shuf_stage(x, shuf_masks[2], shuf_masks[2] >> 4, 4);
91 x = do_shuf_stage(x, shuf_masks[3], shuf_masks[3] >> 8, 8);
92 return x;
93 }
94
HELPER(zip)95 target_ulong HELPER(zip)(target_ulong rs1)
96 {
97 target_ulong x = rs1;
98
99 x = do_shuf_stage(x, shuf_masks[3], shuf_masks[3] >> 8, 8);
100 x = do_shuf_stage(x, shuf_masks[2], shuf_masks[2] >> 4, 4);
101 x = do_shuf_stage(x, shuf_masks[1], shuf_masks[1] >> 2, 2);
102 x = do_shuf_stage(x, shuf_masks[0], shuf_masks[0] >> 1, 1);
103 return x;
104 }
105
do_xperm(target_ulong rs1,target_ulong rs2,uint32_t sz_log2)106 static inline target_ulong do_xperm(target_ulong rs1, target_ulong rs2,
107 uint32_t sz_log2)
108 {
109 target_ulong r = 0;
110 target_ulong sz = 1LL << sz_log2;
111 target_ulong mask = (1LL << sz) - 1;
112 target_ulong pos;
113
114 for (int i = 0; i < TARGET_LONG_BITS; i += sz) {
115 pos = ((rs2 >> i) & mask) << sz_log2;
116 if (pos < sizeof(target_ulong) * 8) {
117 r |= ((rs1 >> pos) & mask) << i;
118 }
119 }
120 return r;
121 }
122
HELPER(xperm4)123 target_ulong HELPER(xperm4)(target_ulong rs1, target_ulong rs2)
124 {
125 return do_xperm(rs1, rs2, 2);
126 }
127
HELPER(xperm8)128 target_ulong HELPER(xperm8)(target_ulong rs1, target_ulong rs2)
129 {
130 return do_xperm(rs1, rs2, 3);
131 }
132