forked from Minki/linux
8fefde90e9
This is a combination of the the Intel algorithm implemented using SSE and PCLMULQDQ instructions from arch/x86/crypto/crc32-pclmul_asm.S, and the new CRC32 extensions introduced for both 32-bit and 64-bit ARM in version 8 of the architecture. Two versions of the above combo are provided, one for CRC32 and one for CRC32C. The PMULL/NEON algorithm is faster, but operates on blocks of at least 64 bytes, and on multiples of 16 bytes only. For the remaining input, or for all input on systems that lack the PMULL 64x64->128 instructions, the CRC32 instructions will be used. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
267 lines
6.5 KiB
ArmAsm
267 lines
6.5 KiB
ArmAsm
/*
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* Accelerated CRC32(C) using arm64 CRC, NEON and Crypto Extensions instructions
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*
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* Copyright (C) 2016 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 modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/* GPL HEADER START
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*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 only,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License version 2 for more details (a copy is included
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* in the LICENSE file that accompanied this code).
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; If not, see http://www.gnu.org/licenses
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*
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* Please visit http://www.xyratex.com/contact if you need additional
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* information or have any questions.
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*
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* GPL HEADER END
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*/
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/*
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* Copyright 2012 Xyratex Technology Limited
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*
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* Using hardware provided PCLMULQDQ instruction to accelerate the CRC32
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* calculation.
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* CRC32 polynomial:0x04c11db7(BE)/0xEDB88320(LE)
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* PCLMULQDQ is a new instruction in Intel SSE4.2, the reference can be found
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* at:
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* http://www.intel.com/products/processor/manuals/
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* Intel(R) 64 and IA-32 Architectures Software Developer's Manual
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* Volume 2B: Instruction Set Reference, N-Z
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*
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* Authors: Gregory Prestas <Gregory_Prestas@us.xyratex.com>
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* Alexander Boyko <Alexander_Boyko@xyratex.com>
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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.text
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.align 6
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.cpu generic+crypto+crc
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.Lcrc32_constants:
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/*
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* [x4*128+32 mod P(x) << 32)]' << 1 = 0x154442bd4
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* #define CONSTANT_R1 0x154442bd4LL
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*
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* [(x4*128-32 mod P(x) << 32)]' << 1 = 0x1c6e41596
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* #define CONSTANT_R2 0x1c6e41596LL
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*/
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.octa 0x00000001c6e415960000000154442bd4
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/*
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* [(x128+32 mod P(x) << 32)]' << 1 = 0x1751997d0
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* #define CONSTANT_R3 0x1751997d0LL
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*
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* [(x128-32 mod P(x) << 32)]' << 1 = 0x0ccaa009e
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* #define CONSTANT_R4 0x0ccaa009eLL
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*/
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.octa 0x00000000ccaa009e00000001751997d0
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/*
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* [(x64 mod P(x) << 32)]' << 1 = 0x163cd6124
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* #define CONSTANT_R5 0x163cd6124LL
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*/
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.quad 0x0000000163cd6124
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.quad 0x00000000FFFFFFFF
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/*
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* #define CRCPOLY_TRUE_LE_FULL 0x1DB710641LL
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*
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* Barrett Reduction constant (u64`) = u` = (x**64 / P(x))`
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* = 0x1F7011641LL
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* #define CONSTANT_RU 0x1F7011641LL
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*/
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.octa 0x00000001F701164100000001DB710641
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.Lcrc32c_constants:
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.octa 0x000000009e4addf800000000740eef02
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.octa 0x000000014cd00bd600000000f20c0dfe
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.quad 0x00000000dd45aab8
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.quad 0x00000000FFFFFFFF
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.octa 0x00000000dea713f10000000105ec76f0
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vCONSTANT .req v0
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dCONSTANT .req d0
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qCONSTANT .req q0
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BUF .req x0
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LEN .req x1
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CRC .req x2
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vzr .req v9
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/**
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* Calculate crc32
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* BUF - buffer
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* LEN - sizeof buffer (multiple of 16 bytes), LEN should be > 63
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* CRC - initial crc32
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* return %eax crc32
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* uint crc32_pmull_le(unsigned char const *buffer,
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* size_t len, uint crc32)
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*/
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ENTRY(crc32_pmull_le)
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adr x3, .Lcrc32_constants
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b 0f
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ENTRY(crc32c_pmull_le)
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adr x3, .Lcrc32c_constants
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0: bic LEN, LEN, #15
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ld1 {v1.16b-v4.16b}, [BUF], #0x40
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movi vzr.16b, #0
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fmov dCONSTANT, CRC
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eor v1.16b, v1.16b, vCONSTANT.16b
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sub LEN, LEN, #0x40
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cmp LEN, #0x40
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b.lt less_64
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ldr qCONSTANT, [x3]
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loop_64: /* 64 bytes Full cache line folding */
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sub LEN, LEN, #0x40
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pmull2 v5.1q, v1.2d, vCONSTANT.2d
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pmull2 v6.1q, v2.2d, vCONSTANT.2d
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pmull2 v7.1q, v3.2d, vCONSTANT.2d
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pmull2 v8.1q, v4.2d, vCONSTANT.2d
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pmull v1.1q, v1.1d, vCONSTANT.1d
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pmull v2.1q, v2.1d, vCONSTANT.1d
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pmull v3.1q, v3.1d, vCONSTANT.1d
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pmull v4.1q, v4.1d, vCONSTANT.1d
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eor v1.16b, v1.16b, v5.16b
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ld1 {v5.16b}, [BUF], #0x10
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eor v2.16b, v2.16b, v6.16b
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ld1 {v6.16b}, [BUF], #0x10
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eor v3.16b, v3.16b, v7.16b
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ld1 {v7.16b}, [BUF], #0x10
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eor v4.16b, v4.16b, v8.16b
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ld1 {v8.16b}, [BUF], #0x10
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eor v1.16b, v1.16b, v5.16b
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eor v2.16b, v2.16b, v6.16b
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eor v3.16b, v3.16b, v7.16b
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eor v4.16b, v4.16b, v8.16b
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cmp LEN, #0x40
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b.ge loop_64
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less_64: /* Folding cache line into 128bit */
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ldr qCONSTANT, [x3, #16]
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pmull2 v5.1q, v1.2d, vCONSTANT.2d
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pmull v1.1q, v1.1d, vCONSTANT.1d
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eor v1.16b, v1.16b, v5.16b
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eor v1.16b, v1.16b, v2.16b
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pmull2 v5.1q, v1.2d, vCONSTANT.2d
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pmull v1.1q, v1.1d, vCONSTANT.1d
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eor v1.16b, v1.16b, v5.16b
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eor v1.16b, v1.16b, v3.16b
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pmull2 v5.1q, v1.2d, vCONSTANT.2d
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pmull v1.1q, v1.1d, vCONSTANT.1d
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eor v1.16b, v1.16b, v5.16b
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eor v1.16b, v1.16b, v4.16b
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cbz LEN, fold_64
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loop_16: /* Folding rest buffer into 128bit */
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subs LEN, LEN, #0x10
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ld1 {v2.16b}, [BUF], #0x10
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pmull2 v5.1q, v1.2d, vCONSTANT.2d
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pmull v1.1q, v1.1d, vCONSTANT.1d
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eor v1.16b, v1.16b, v5.16b
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eor v1.16b, v1.16b, v2.16b
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b.ne loop_16
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fold_64:
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/* perform the last 64 bit fold, also adds 32 zeroes
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* to the input stream */
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ext v2.16b, v1.16b, v1.16b, #8
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pmull2 v2.1q, v2.2d, vCONSTANT.2d
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ext v1.16b, v1.16b, vzr.16b, #8
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eor v1.16b, v1.16b, v2.16b
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/* final 32-bit fold */
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ldr dCONSTANT, [x3, #32]
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ldr d3, [x3, #40]
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ext v2.16b, v1.16b, vzr.16b, #4
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and v1.16b, v1.16b, v3.16b
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pmull v1.1q, v1.1d, vCONSTANT.1d
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eor v1.16b, v1.16b, v2.16b
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/* Finish up with the bit-reversed barrett reduction 64 ==> 32 bits */
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ldr qCONSTANT, [x3, #48]
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and v2.16b, v1.16b, v3.16b
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ext v2.16b, vzr.16b, v2.16b, #8
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pmull2 v2.1q, v2.2d, vCONSTANT.2d
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and v2.16b, v2.16b, v3.16b
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pmull v2.1q, v2.1d, vCONSTANT.1d
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eor v1.16b, v1.16b, v2.16b
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mov w0, v1.s[1]
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ret
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ENDPROC(crc32_pmull_le)
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ENDPROC(crc32c_pmull_le)
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.macro __crc32, c
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0: subs x2, x2, #16
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b.mi 8f
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ldp x3, x4, [x1], #16
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CPU_BE( rev x3, x3 )
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CPU_BE( rev x4, x4 )
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crc32\c\()x w0, w0, x3
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crc32\c\()x w0, w0, x4
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b.ne 0b
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ret
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8: tbz x2, #3, 4f
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ldr x3, [x1], #8
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CPU_BE( rev x3, x3 )
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crc32\c\()x w0, w0, x3
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4: tbz x2, #2, 2f
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ldr w3, [x1], #4
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CPU_BE( rev w3, w3 )
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crc32\c\()w w0, w0, w3
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2: tbz x2, #1, 1f
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ldrh w3, [x1], #2
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CPU_BE( rev16 w3, w3 )
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crc32\c\()h w0, w0, w3
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1: tbz x2, #0, 0f
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ldrb w3, [x1]
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crc32\c\()b w0, w0, w3
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0: ret
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.endm
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.align 5
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ENTRY(crc32_armv8_le)
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__crc32
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ENDPROC(crc32_armv8_le)
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.align 5
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ENTRY(crc32c_armv8_le)
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__crc32 c
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ENDPROC(crc32c_armv8_le)
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