LXR linux/arch/arm/lib/xor-neon.c

   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
  11MODULE_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
  36struct 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};
  43EXPORT_SYMBOL(xor_block_neon_inner);
  44