root/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 
  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);