1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/arch/arm/lib/xor-neon.c 4 * 5 * Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org> 6 */ 7 8 #include <linux/raid/xor.h> 9 #include <linux/module.h> 10 11 MODULE_LICENSE("GPL"); 12 13 #ifndef __ARM_NEON__ 14 #error You should compile this file with '-march=armv7-a -mfloat-abi=softfp -mfpu=neon' 15 #endif 16 17 /* 18 * Pull in the reference implementations while instructing GCC (through 19 * -ftree-vectorize) to attempt to exploit implicit parallelism and emit 20 * NEON instructions. 21 */ 22 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6) 23 #pragma GCC optimize "tree-vectorize" 24 #else 25 /* 26 * While older versions of GCC do not generate incorrect code, they fail to 27 * recognize the parallel nature of these functions, and emit plain ARM code, 28 * which is known to be slower than the optimized ARM code in asm-arm/xor.h. 29 */ 30 #warning This code requires at least version 4.6 of GCC 31 #endif 32 33 #pragma GCC diagnostic ignored "-Wunused-variable" 34 #include <asm-generic/xor.h> 35 36 struct xor_block_template const xor_block_neon_inner = { 37 .name = "__inner_neon__", 38 .do_2 = xor_8regs_2, 39 .do_3 = xor_8regs_3, 40 .do_4 = xor_8regs_4, 41 .do_5 = xor_8regs_5, 42 }; 43 EXPORT_SYMBOL(xor_block_neon_inner); 44