1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2012 Intel Corporation
4 * Copyright (C) 2017 Linaro Ltd. <ard.biesheuvel@linaro.org>
5 */
6
7 #include <arm_neon.h>
8 #include "neon.h"
9
10 #ifdef CONFIG_ARM
11 /*
12 * AArch32 does not provide this intrinsic natively because it does not
13 * implement the underlying instruction. AArch32 only provides a 64-bit
14 * wide vtbl.8 instruction, so use that instead.
15 */
16 static uint8x16_t vqtbl1q_u8(uint8x16_t a, uint8x16_t b)
17 {
18 union {
19 uint8x16_t val;
20 uint8x8x2_t pair;
21 } __a = { a };
22
23 return vcombine_u8(vtbl2_u8(__a.pair, vget_low_u8(b)),
24 vtbl2_u8(__a.pair, vget_high_u8(b)));
25 }
26 #endif
27
28 void __raid6_2data_recov_neon(int bytes, uint8_t *p, uint8_t *q, uint8_t *dp,
29 uint8_t *dq, const uint8_t *pbmul,
30 const uint8_t *qmul)
31 {
32 uint8x16_t pm0 = vld1q_u8(pbmul);
33 uint8x16_t pm1 = vld1q_u8(pbmul + 16);
34 uint8x16_t qm0 = vld1q_u8(qmul);
35 uint8x16_t qm1 = vld1q_u8(qmul + 16);
36 uint8x16_t x0f = vdupq_n_u8(0x0f);
37
38 /*
39 * while ( bytes-- ) {
40 * uint8_t px, qx, db;
41 *
42 * px = *p ^ *dp;
43 * qx = qmul[*q ^ *dq];
44 * *dq++ = db = pbmul[px] ^ qx;
45 * *dp++ = db ^ px;
46 * p++; q++;
47 * }
48 */
49
50 while (bytes) {
51 uint8x16_t vx, vy, px, qx, db;
52
53 px = veorq_u8(vld1q_u8(p), vld1q_u8(dp));
54 vx = veorq_u8(vld1q_u8(q), vld1q_u8(dq));
55
56 vy = vshrq_n_u8(vx, 4);
57 vx = vqtbl1q_u8(qm0, vandq_u8(vx, x0f));
58 vy = vqtbl1q_u8(qm1, vy);
59 qx = veorq_u8(vx, vy);
60
61 vy = vshrq_n_u8(px, 4);
62 vx = vqtbl1q_u8(pm0, vandq_u8(px, x0f));
63 vy = vqtbl1q_u8(pm1, vy);
64 vx = veorq_u8(vx, vy);
65 db = veorq_u8(vx, qx);
66
67 vst1q_u8(dq, db);
68 vst1q_u8(dp, veorq_u8(db, px));
69
70 bytes -= 16;
71 p += 16;
72 q += 16;
73 dp += 16;
74 dq += 16;
75 }
76 }
77
78 void __raid6_datap_recov_neon(int bytes, uint8_t *p, uint8_t *q, uint8_t *dq,
79 const uint8_t *qmul)
80 {
81 uint8x16_t qm0 = vld1q_u8(qmul);
82 uint8x16_t qm1 = vld1q_u8(qmul + 16);
83 uint8x16_t x0f = vdupq_n_u8(0x0f);
84
85 /*
86 * while (bytes--) {
87 * *p++ ^= *dq = qmul[*q ^ *dq];
88 * q++; dq++;
89 * }
90 */
91
92 while (bytes) {
93 uint8x16_t vx, vy;
94
95 vx = veorq_u8(vld1q_u8(q), vld1q_u8(dq));
96
97 vy = vshrq_n_u8(vx, 4);
98 vx = vqtbl1q_u8(qm0, vandq_u8(vx, x0f));
99 vy = vqtbl1q_u8(qm1, vy);
100 vx = veorq_u8(vx, vy);
101 vy = veorq_u8(vx, vld1q_u8(p));
102
103 vst1q_u8(dq, vx);
104 vst1q_u8(p, vy);
105
106 bytes -= 16;
107 p += 16;
108 q += 16;
109 dq += 16;
110 }
111 }
112
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