arch/arm/lib/xor-neon.c

   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 '-march=armv7-a -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);