101956597SArd Biesheuvel /* 201956597SArd Biesheuvel * linux/arch/arm/lib/xor-neon.c 301956597SArd Biesheuvel * 401956597SArd Biesheuvel * Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org> 501956597SArd Biesheuvel * 601956597SArd Biesheuvel * This program is free software; you can redistribute it and/or modify 701956597SArd Biesheuvel * it under the terms of the GNU General Public License version 2 as 801956597SArd Biesheuvel * published by the Free Software Foundation. 901956597SArd Biesheuvel */ 1001956597SArd Biesheuvel 1101956597SArd Biesheuvel #include <linux/raid/xor.h> 129319206dSArd Biesheuvel #include <linux/module.h> 139319206dSArd Biesheuvel 149319206dSArd Biesheuvel MODULE_LICENSE("GPL"); 1501956597SArd Biesheuvel 1601956597SArd Biesheuvel #ifndef __ARM_NEON__ 17de9c0d49SNathan Chancellor #error You should compile this file with '-march=armv7-a -mfloat-abi=softfp -mfpu=neon' 1801956597SArd Biesheuvel #endif 1901956597SArd Biesheuvel 2001956597SArd Biesheuvel /* 2101956597SArd Biesheuvel * Pull in the reference implementations while instructing GCC (through 2201956597SArd Biesheuvel * -ftree-vectorize) to attempt to exploit implicit parallelism and emit 2301956597SArd Biesheuvel * NEON instructions. 2401956597SArd Biesheuvel */ 2501956597SArd Biesheuvel #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6) 2601956597SArd Biesheuvel #pragma GCC optimize "tree-vectorize" 2701956597SArd Biesheuvel #else 2801956597SArd Biesheuvel /* 2901956597SArd Biesheuvel * While older versions of GCC do not generate incorrect code, they fail to 3001956597SArd Biesheuvel * recognize the parallel nature of these functions, and emit plain ARM code, 3101956597SArd Biesheuvel * which is known to be slower than the optimized ARM code in asm-arm/xor.h. 3201956597SArd Biesheuvel */ 3301956597SArd Biesheuvel #warning This code requires at least version 4.6 of GCC 3401956597SArd Biesheuvel #endif 3501956597SArd Biesheuvel 3601956597SArd Biesheuvel #pragma GCC diagnostic ignored "-Wunused-variable" 3701956597SArd Biesheuvel #include <asm-generic/xor.h> 3801956597SArd Biesheuvel 3901956597SArd Biesheuvel struct xor_block_template const xor_block_neon_inner = { 4001956597SArd Biesheuvel .name = "__inner_neon__", 4101956597SArd Biesheuvel .do_2 = xor_8regs_2, 4201956597SArd Biesheuvel .do_3 = xor_8regs_3, 4301956597SArd Biesheuvel .do_4 = xor_8regs_4, 4401956597SArd Biesheuvel .do_5 = xor_8regs_5, 4501956597SArd Biesheuvel }; 469319206dSArd Biesheuvel EXPORT_SYMBOL(xor_block_neon_inner); 47