Subversion Repositories hf-risc

/* Copyright (C) 2014 Free Software Foundation, Inc.

   Contributed by Andrew Waterman (waterman@cs.berkeley.edu) at UC Berkeley.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library.  If not, see

   .  */

#include 

#include 

ENTRY(memset)

  li a6, 15

  move a4, a0

  bleu a2, a6, .Ltiny

  and a5, a4, 15

  bnez a5, .Lmisaligned

.Laligned:

  bnez a1, .Lwordify

.Lwordified:

  and a3, a2, ~15

  and a2, a2, 15

  add a3, a3, a4

#ifdef __riscv64

1:sd a1, 0(a4)

  sd a1, 8(a4)

#else

1:sw a1, 0(a4)

  sw a1, 4(a4)

  sw a1, 8(a4)

  sw a1, 12(a4)

#endif

  add a4, a4, 16

  bltu a4, a3, 1b

  bnez a2, .Ltiny

  ret

.Ltiny:

  sub a3, a6, a2

  sll a3, a3, 2

1:auipc t0, %pcrel_hi(.Ltable)

  add a3, a3, t0

.option push

.option norvc

.Ltable_misaligned:

  jr a3, %pcrel_lo(1b)

.Ltable:

  sb a1,14(a4)

  sb a1,13(a4)

  sb a1,12(a4)

  sb a1,11(a4)

  sb a1,10(a4)

  sb a1, 9(a4)

  sb a1, 8(a4)

  sb a1, 7(a4)

  sb a1, 6(a4)

  sb a1, 5(a4)

  sb a1, 4(a4)

  sb a1, 3(a4)

  sb a1, 2(a4)

  sb a1, 1(a4)

  sb a1, 0(a4)

.option pop

  ret

.Lwordify:

  and a1, a1, 0xFF

  sll a3, a1, 8

  or  a1, a1, a3

  sll a3, a1, 16

  or  a1, a1, a3

#ifdef __riscv64

  sll a3, a1, 32

  or  a1, a1, a3

#endif

  j .Lwordified

.Lmisaligned:

  sll a3, a5, 2

1:auipc t0, %pcrel_hi(.Ltable_misaligned)

  add a3, a3, t0

  mv t0, ra

  jalr a3, %pcrel_lo(1b)

  mv ra, t0

  add a5, a5, -16

  sub a4, a4, a5

  add a2, a2, a5

  bleu a2, a6, .Ltiny

  j .Laligned

END(memset)

weak_alias(memset, __GI_memset)