1 /* 2 * linux/arch/arm/lib/xor-neon.c 3 * 4 * Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 11 #include <linux/raid/xor.h> 12 #include <linux/module.h> 13 14 MODULE_LICENSE("GPL"); 15 16 #ifndef __ARM_NEON__ 17 #error You should compile this file with '-mfloat-abi=softfp -mfpu=neon' 18 #endif 19 20 /* 21 * Pull in the reference implementations while instructing GCC (through 22 * -ftree-vectorize) to attempt to exploit implicit parallelism and emit 23 * NEON instructions. 24 */ 25 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6) 26 #pragma GCC optimize "tree-vectorize" 27 #else 28 /* 29 * While older versions of GCC do not generate incorrect code, they fail to 30 * recognize the parallel nature of these functions, and emit plain ARM code, 31 * which is known to be slower than the optimized ARM code in asm-arm/xor.h. 32 */ 33 #warning This code requires at least version 4.6 of GCC 34 #endif 35 36 #pragma GCC diagnostic ignored "-Wunused-variable" 37 #include <asm-generic/xor.h> 38 39 struct xor_block_template const xor_block_neon_inner = { 40 .name = "__inner_neon__", 41 .do_2 = xor_8regs_2, 42 .do_3 = xor_8regs_3, 43 .do_4 = xor_8regs_4, 44 .do_5 = xor_8regs_5, 45 }; 46 EXPORT_SYMBOL(xor_block_neon_inner); 47