6ec4e2514d
Provide a NEON accelerated implementation of the recovery algorithm, which supersedes the default byte-by-byte one. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
117 lines
2.6 KiB
C
117 lines
2.6 KiB
C
/*
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* Copyright (C) 2012 Intel Corporation
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* Copyright (C) 2017 Linaro Ltd. <ard.biesheuvel@linaro.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; version 2
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* of the License.
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*/
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#include <arm_neon.h>
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static const uint8x16_t x0f = {
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0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
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0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
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};
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#ifdef CONFIG_ARM
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/*
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* AArch32 does not provide this intrinsic natively because it does not
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* implement the underlying instruction. AArch32 only provides a 64-bit
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* wide vtbl.8 instruction, so use that instead.
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*/
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static uint8x16_t vqtbl1q_u8(uint8x16_t a, uint8x16_t b)
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{
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union {
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uint8x16_t val;
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uint8x8x2_t pair;
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} __a = { a };
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return vcombine_u8(vtbl2_u8(__a.pair, vget_low_u8(b)),
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vtbl2_u8(__a.pair, vget_high_u8(b)));
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}
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#endif
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void __raid6_2data_recov_neon(int bytes, uint8_t *p, uint8_t *q, uint8_t *dp,
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uint8_t *dq, const uint8_t *pbmul,
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const uint8_t *qmul)
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{
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uint8x16_t pm0 = vld1q_u8(pbmul);
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uint8x16_t pm1 = vld1q_u8(pbmul + 16);
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uint8x16_t qm0 = vld1q_u8(qmul);
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uint8x16_t qm1 = vld1q_u8(qmul + 16);
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/*
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* while ( bytes-- ) {
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* uint8_t px, qx, db;
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*
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* px = *p ^ *dp;
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* qx = qmul[*q ^ *dq];
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* *dq++ = db = pbmul[px] ^ qx;
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* *dp++ = db ^ px;
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* p++; q++;
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* }
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*/
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while (bytes) {
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uint8x16_t vx, vy, px, qx, db;
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px = veorq_u8(vld1q_u8(p), vld1q_u8(dp));
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vx = veorq_u8(vld1q_u8(q), vld1q_u8(dq));
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vy = (uint8x16_t)vshrq_n_s16((int16x8_t)vx, 4);
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vx = vqtbl1q_u8(qm0, vandq_u8(vx, x0f));
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vy = vqtbl1q_u8(qm1, vandq_u8(vy, x0f));
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qx = veorq_u8(vx, vy);
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vy = (uint8x16_t)vshrq_n_s16((int16x8_t)px, 4);
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vx = vqtbl1q_u8(pm0, vandq_u8(px, x0f));
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vy = vqtbl1q_u8(pm1, vandq_u8(vy, x0f));
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vx = veorq_u8(vx, vy);
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db = veorq_u8(vx, qx);
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vst1q_u8(dq, db);
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vst1q_u8(dp, veorq_u8(db, px));
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bytes -= 16;
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p += 16;
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q += 16;
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dp += 16;
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dq += 16;
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}
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}
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void __raid6_datap_recov_neon(int bytes, uint8_t *p, uint8_t *q, uint8_t *dq,
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const uint8_t *qmul)
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{
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uint8x16_t qm0 = vld1q_u8(qmul);
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uint8x16_t qm1 = vld1q_u8(qmul + 16);
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/*
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* while (bytes--) {
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* *p++ ^= *dq = qmul[*q ^ *dq];
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* q++; dq++;
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* }
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*/
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while (bytes) {
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uint8x16_t vx, vy;
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vx = veorq_u8(vld1q_u8(q), vld1q_u8(dq));
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vy = (uint8x16_t)vshrq_n_s16((int16x8_t)vx, 4);
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vx = vqtbl1q_u8(qm0, vandq_u8(vx, x0f));
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vy = vqtbl1q_u8(qm1, vandq_u8(vy, x0f));
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vx = veorq_u8(vx, vy);
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vy = veorq_u8(vx, vld1q_u8(p));
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vst1q_u8(dq, vx);
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vst1q_u8(p, vy);
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bytes -= 16;
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p += 16;
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q += 16;
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dq += 16;
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}
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}
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