xref: /src/external/gpl3/gcc/dist/libgcc/config/visium/memcpy.c

/* Copyright (C) 2012-2024 Free Software Foundation, Inc.

   This file is part of GCC.

   GCC is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.

   GCC 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 General Public
   License for more details.

   Under Section 7 of GPL version 3, you are granted additional
   permissions described in the GCC Runtime Library Exception, version
   3.1, as published by the Free Software Foundation.

   You should have received a copy of the GNU General Public License and
   a copy of the GCC Runtime Library Exception along with this program;
   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
   <http://www.gnu.org/licenses/>.  */

/* This file must be kept in sync with newlib/libc/machine/visium/memcpy.c  */

#include <stddef.h>
#include "memcpy.h"

#define INST_BARRIER   __asm__ __volatile__ ("":::"memory");

#define MOVE_32_OBJECTS(in,out)	\
do {				\
  INST_BARRIER			\
  m0 = in [0];			\
  m1 = in [1];			\
  m2 = in [2];			\
  m3 = in [3];			\
  out [0] = m0;			\
  out [1] = m1;			\
  out [2] = m2;			\
  out [3] = m3;			\
  INST_BARRIER			\
  m0 = in [4];			\
  m1 = in [5];			\
  m2 = in [6];			\
  m3 = in [7];			\
  out [4] = m0;			\
  out [5] = m1;			\
  out [6] = m2;			\
  out [7] = m3;			\
  INST_BARRIER			\
  m0 = in [8];			\
  m1 = in [9];			\
  m2 = in [10];			\
  m3 = in [11];			\
  out [8] = m0;			\
  out [9] = m1;			\
  out [10] = m2;		\
  out [11] = m3;		\
  INST_BARRIER			\
  m0 = in [12];			\
  m1 = in [13];			\
  m2 = in [14];			\
  m3 = in [15];			\
  out [12] = m0;		\
  out [13] = m1;		\
  out [14] = m2;		\
  out [15] = m3;		\
  INST_BARRIER			\
  m0 = in [16];			\
  m1 = in [17];			\
  m2 = in [18];			\
  m3 = in [19];			\
  out [16] = m0;		\
  out [17] = m1;		\
  out [18] = m2;		\
  out [19] = m3;		\
  INST_BARRIER			\
  m0 = in [20];			\
  m1 = in [21];			\
  m2 = in [22];			\
  m3 = in [23];			\
  out [20] = m0;		\
  out [21] = m1;		\
  out [22] = m2;		\
  out [23] = m3;		\
  INST_BARRIER			\
  m0 = in [24];			\
  m1 = in [25];			\
  m2 = in [26];			\
  m3 = in [27];			\
  out [24] = m0;		\
  out [25] = m1;		\
  out [26] = m2;		\
  out [27] = m3;		\
  INST_BARRIER			\
  m0 =	in [28];		\
  m1 = in [29];			\
  m2 = in [30];			\
  m3 = in [31];			\
  out [28] = m0;		\
  out [29] = m1;		\
  out [30] = m2;		\
  out [31] = m3;		\
  INST_BARRIER			\
  in += 32;			\
  out += 32;			\
} while(0)

#define MOVE_16_OBJECTS(in,out)	\
do {				\
  INST_BARRIER			\
  m0 = in [0];			\
  m1 = in [1];			\
  m2 = in [2];			\
  m3 = in [3];			\
  out [0] = m0;			\
  out [1] = m1;			\
  out [2] = m2;			\
  out [3] = m3;			\
  INST_BARRIER			\
  m0 = in [4];			\
  m1 = in [5];			\
  m2 = in [6];			\
  m3 = in [7];			\
  out [4] = m0;			\
  out [5] = m1;			\
  out [6] = m2;			\
  out [7] = m3;			\
  INST_BARRIER			\
  m0 = in [8];			\
  m1 = in [9];			\
  m2 = in [10];			\
  m3 = in [11];			\
  out [8] = m0;			\
  out [9] = m1;			\
  out [10] = m2;		\
  out [11] = m3;		\
  INST_BARRIER			\
  m0 = in [12];			\
  m1 = in [13];			\
  m2 = in [14];			\
  m3 = in [15];			\
  out [12] = m0;		\
  out [13] = m1;		\
  out [14] = m2;		\
  out [15] = m3;		\
  INST_BARRIER			\
  in += 16;			\
  out += 16;			\
} while(0)

#define MOVE_12_OBJECTS(in,out)	\
do {				\
  INST_BARRIER			\
  m0 = in [0];			\
  m1 = in [1];			\
  m2 = in [2];			\
  m3 = in [3];			\
  out [0] = m0;			\
  out [1] = m1;			\
  out [2] = m2;			\
  out [3] = m3;			\
  INST_BARRIER			\
  m0 = in [4];			\
  m1 = in [5];			\
  m2 = in [6];			\
  m3 = in [7];			\
  out [4] = m0;			\
  out [5] = m1;			\
  out [6] = m2;			\
  out [7] = m3;			\
  INST_BARRIER			\
  m0 = in [8];			\
  m1 = in [9];			\
  m2 = in [10];			\
  m3 = in [11];			\
  out [8] = m0;			\
  out [9] = m1;			\
  out [10] = m2;		\
  out [11] = m3;		\
  INST_BARRIER			\
  in += 12;			\
  out += 12;			\
} while(0)

#define MOVE_11_OBJECTS(in,out)	\
do {				\
  INST_BARRIER			\
  m0 = in [0];			\
  m1 = in [1];			\
  m2 = in [2];			\
  m3 = in [3];			\
  out [0] = m0;			\
  out [1] = m1;			\
  out [2] = m2;			\
  out [3] = m3;			\
  INST_BARRIER			\
  m0 = in [4];			\
  m1 = in [5];			\
  m2 = in [6];			\
  m3 = in [7];			\
  out [4] = m0;			\
  out [5] = m1;			\
  out [6] = m2;			\
  out [7] = m3;			\
  INST_BARRIER			\
  m0 = in [8];			\
  m1 = in [9];			\
  m2 = in [10];			\
  out [8] = m0;			\
  out [9] = m1;			\
  out [10] = m2;		\
  INST_BARRIER			\
  in += 11;			\
  out += 11;			\
} while(0)

#define MOVE_10_OBJECTS(in,out)	\
do {				\
  INST_BARRIER			\
  m0 = in [0];			\
  m1 = in [1];			\
  m2 = in [2];			\
  m3 = in [3];			\
  out [0] = m0;			\
  out [1] = m1;			\
  out [2] = m2;			\
  out [3] = m3;			\
  INST_BARRIER			\
  m0 = in [4];			\
  m1 = in [5];			\
  m2 = in [6];			\
  m3 = in [7];			\
  out [4] = m0;			\
  m0 = in [8];			\
  out [5] = m1;			\
  m1 = in [9];			\
  out [6] = m2;			\
  out [7] = m3;			\
  out [8] = m0;			\
  out [9] = m1;			\
  INST_BARRIER			\
  in += 10;			\
  out += 10;			\
} while(0)

#define MOVE_9_OBJECTS(in,out)	\
do {				\
  INST_BARRIER			\
  m0 = in [0];			\
  m1 = in [1];			\
  m2 = in [2];			\
  m3 = in [3];			\
  out [0] = m0;			\
  out [1] = m1;			\
  out [2] = m2;			\
  out [3] = m3;			\
  INST_BARRIER			\
  m0 = in [4];			\
  m1 = in [5];			\
  m2 = in [6];			\
  m3 = in [7];			\
  out [4] = m0;			\
  out [5] = m1;			\
  out [6] = m2;			\
  out [7] = m3;			\
  INST_BARRIER			\
  m0 = in [8];			\
  out [8] = m0;			\
  in += 9;			\
  out += 9;			\
} while(0)

#define MOVE_8_OBJECTS(in,out)	\
do {				\
  INST_BARRIER			\
  m0 = in [0];			\
  m1 = in [1];			\
  m2 = in [2];			\
  m3 = in [3];			\
  out [0] = m0;			\
  out [1] = m1;			\
  out [2] = m2;			\
  out [3] = m3;			\
  INST_BARRIER			\
  m0 = in [4];			\
  m1 = in [5];			\
  m2 = in [6];			\
  m3 = in [7];			\
  out [4] = m0;			\
  out [5] = m1;			\
  out [6] = m2;			\
  out [7] = m3;			\
  INST_BARRIER			\
  in += 8;			\
  out += 8;			\
} while(0)

#define MOVE_7_OBJECTS(in,out)	\
do {				\
  INST_BARRIER			\
  m0 = in [0];			\
  m1 = in [1];			\
  m2 = in [2];			\
  m3 = in [3];			\
  out [0] = m0;			\
  out [1] = m1;			\
  out [2] = m2;			\
  out [3] = m3;			\
  INST_BARRIER			\
  m0 = in [4];			\
  m1 = in [5];			\
  m2 = in [6];			\
  out [4] = m0;			\
  out [5] = m1;			\
  out [6] = m2;			\
  INST_BARRIER			\
  in += 7;			\
  out += 7;			\
} while(0)

#define MOVE_6_OBJECTS(in,out)	\
do {				\
  INST_BARRIER			\
  m0 = in [0];			\
  m1 = in [1];			\
  m2 = in [2];			\
  m3 = in [3];			\
  out [0] = m0;			\
  INST_BARRIER			\
  m0 = in [4];			\
  out [1] = m1;			\
  INST_BARRIER			\
  m1 = in [5];			\
  out [2] = m2;			\
  out [3] = m3;			\
  out [4] = m0;			\
  out [5] = m1;			\
  INST_BARRIER			\
  in += 6;			\
  out += 6;			\
} while(0)

#define MOVE_5_OBJECTS(in,out)	\
do {				\
  INST_BARRIER			\
  m0 = in [0];			\
  m1 = in [1];			\
  m2 = in [2];			\
  m3 = in [3];			\
  INST_BARRIER			\
  out [0] = m0;			\
  m0 = in [4];			\
  INST_BARRIER			\
  out [1] = m1;			\
  out [2] = m2;			\
  out [3] = m3;			\
  out [4] = m0;			\
  INST_BARRIER			\
  in += 5;			\
  out += 5;			\
} while(0)

#define MOVE_4_OBJECTS(in,out)	\
do {				\
  INST_BARRIER			\
  m0 = in [0];			\
  m1 = in [1];			\
  m2 = in [2];			\
  m3 = in [3];			\
  out [0] = m0;			\
  out [1] = m1;			\
  out [2] = m2;			\
  out [3] = m3;			\
  INST_BARRIER			\
  in += 4;			\
  out += 4;			\
} while(0)

#define MOVE_3_OBJECTS(in,out)	\
do {				\
  INST_BARRIER			\
  m0 = in [0];			\
  m1 = in [1];			\
  m2 = in [2];			\
  out [0] = m0;			\
  out [1] = m1;			\
  out [2] = m2;			\
  INST_BARRIER			\
  in += 3;			\
  out += 3;			\
} while(0)

#define MOVE_2_OBJECTS(in,out)	\
do {				\
  INST_BARRIER			\
  m0 = in [0];			\
  m1 = in [1];			\
  out [0] = m0;			\
  out [1] = m1;			\
  INST_BARRIER			\
  in += 2;			\
  out += 2;			\
} while(0)

#define MOVE_1_OBJECT(in,out)	\
do {				\
  INST_BARRIER			\
  m0 = in [0];			\
  out [0] = m0;			\
  INST_BARRIER			\
  in += 1;			\
  out += 1;			\
} while(0)


static inline void
__int_memcpy (void *__restrict s1, const void *__restrict s2, size_t n)
{
  int value = n;
  int loop_var;
  const int *in = s2;
  int *out = s1;
  int count;
  int m0,m1,m2,m3;

  /* This code currently give a stall for any value with a 1->2 in the low 5
     bits, i.e.  1,2, 33,34 ? not acceptable!  */
  switch (value & 0x1f)
    {
    case 0:
      break;
    case 1:
      MOVE_1_OBJECT (in, out);
      break;
    case 2:
      MOVE_2_OBJECTS (in, out);
      break;
    case 3:
      MOVE_3_OBJECTS (in, out);
      break;
    case 4:
      MOVE_4_OBJECTS (in, out);
      break;
    case 5:
      MOVE_5_OBJECTS (in, out);
      break;
    case 6:
      MOVE_6_OBJECTS (in, out);
      break;
    case 7:
      MOVE_7_OBJECTS (in, out);
      break;
    case 8:
      MOVE_8_OBJECTS (in, out);
      break;
    case 9:
      MOVE_9_OBJECTS (in, out);
      break;
    case 10:
      MOVE_10_OBJECTS (in, out);
      break;
    case 11:
      MOVE_11_OBJECTS (in, out);
      break;
    case 12:
      MOVE_12_OBJECTS (in, out);
      break;
    case 13:
      MOVE_9_OBJECTS (in, out);
      MOVE_4_OBJECTS (in, out);
      break;
    case 14:
      MOVE_12_OBJECTS (in, out);
      MOVE_2_OBJECTS (in, out);
      break;
    case 15:
      MOVE_11_OBJECTS (in, out);
      MOVE_4_OBJECTS (in, out);
      break;
    case 16:
      MOVE_16_OBJECTS (in, out);
      break;
    case 17:
      MOVE_11_OBJECTS (in, out);
      MOVE_6_OBJECTS (in, out);
      break;
    case 18:
      MOVE_9_OBJECTS (in, out);
      MOVE_9_OBJECTS (in, out);
      break;
    case 19:
      MOVE_16_OBJECTS (in, out);
      MOVE_3_OBJECTS (in, out);
      break;
    case 20:
      MOVE_16_OBJECTS (in, out);
      MOVE_4_OBJECTS (in, out);
      break;
    case 21:
      MOVE_16_OBJECTS (in, out);
      MOVE_5_OBJECTS (in, out);
      break;
    case 22:
      MOVE_16_OBJECTS (in, out);
      MOVE_6_OBJECTS (in, out);
      break;
    case 23:
      MOVE_16_OBJECTS (in, out);
      MOVE_7_OBJECTS (in, out);
      break;
    case 24:
      MOVE_16_OBJECTS (in, out);
      MOVE_8_OBJECTS (in, out);
      break;
    case 25:
      MOVE_16_OBJECTS (in, out);
      MOVE_9_OBJECTS (in, out);
      break;
    case 26:
      MOVE_16_OBJECTS (in, out);
      MOVE_10_OBJECTS (in, out);
      break;
    case 27:
      MOVE_16_OBJECTS (in, out);
      MOVE_11_OBJECTS (in, out);
      break;
    case 28:
      MOVE_16_OBJECTS (in, out);
      MOVE_8_OBJECTS (in, out);
      MOVE_4_OBJECTS (in, out);
      break;
    case 29:
      MOVE_16_OBJECTS (in, out);
      MOVE_9_OBJECTS (in, out);
      MOVE_4_OBJECTS (in, out);
      break;
    case 30:
      MOVE_16_OBJECTS (in, out);
      MOVE_12_OBJECTS (in, out);
      MOVE_2_OBJECTS (in, out);
      break;
    case 31:
      MOVE_16_OBJECTS (in, out);
      MOVE_11_OBJECTS (in, out);
      MOVE_4_OBJECTS (in, out);
      break;
    }

  /* This loop governs the asmptoptic behaviour of this algorithm, for long
     word copies.  */
  count = value >> 5;
  for (loop_var = 0; loop_var < count; loop_var++)
    MOVE_32_OBJECTS (in, out);
}

static inline void
__shrt_int_memcpy (void *__restrict s1, const void *__restrict s2, size_t n)
{
  int value = n;
  int loop_var;
  const short int *in = s2;
  int short *out = s1;
  int count;
  int m0,m1,m2,m3;

 /* This code currently give a stall for any value with a 1->2 in the low 5
    bits, i.e.  1,2, 33,34 ? not acceptable!  */
  switch (value & 0x1f)
    {
    case 0:
      break;
    case 1:
      MOVE_1_OBJECT (in, out);
      break;
    case 2:
      MOVE_2_OBJECTS (in, out);
      break;
    case 3:
      MOVE_3_OBJECTS (in, out);
      break;
    case 4:
      MOVE_4_OBJECTS (in, out);
      break;
    case 5:
      MOVE_5_OBJECTS (in, out);
      break;
    case 6:
      MOVE_6_OBJECTS (in, out);
      break;
    case 7:
      MOVE_7_OBJECTS (in, out);
      break;
    case 8:
      MOVE_8_OBJECTS (in, out);
      break;
    case 9:
      MOVE_9_OBJECTS (in, out);
      break;
    case 10:
      MOVE_10_OBJECTS (in, out);
      break;
    case 11:
      MOVE_11_OBJECTS (in, out);
      break;
    case 12:
      MOVE_12_OBJECTS (in, out);
      break;
    case 13:
      MOVE_9_OBJECTS (in, out);
      MOVE_4_OBJECTS (in, out);
      break;
    case 14:
      MOVE_12_OBJECTS (in, out);
      MOVE_2_OBJECTS (in, out);
      break;
    case 15:
      MOVE_11_OBJECTS (in, out);
      MOVE_4_OBJECTS (in, out);
      break;
    case 16:
      MOVE_16_OBJECTS (in, out);
      break;
    case 17:
      MOVE_11_OBJECTS (in, out);
      MOVE_6_OBJECTS (in, out);
      break;
    case 18:
      MOVE_9_OBJECTS (in, out);
      MOVE_9_OBJECTS (in, out);
      break;
    case 19:
      MOVE_16_OBJECTS (in, out);
      MOVE_3_OBJECTS (in, out);
      break;
    case 20:
      MOVE_16_OBJECTS (in, out);
      MOVE_4_OBJECTS (in, out);
      break;
    case 21:
      MOVE_16_OBJECTS (in, out);
      MOVE_5_OBJECTS (in, out);
      break;
    case 22:
      MOVE_16_OBJECTS (in, out);
      MOVE_6_OBJECTS (in, out);
      break;
    case 23:
      MOVE_16_OBJECTS (in, out);
      MOVE_7_OBJECTS (in, out);
      break;
    case 24:
      MOVE_16_OBJECTS (in, out);
      MOVE_8_OBJECTS (in, out);
      break;
    case 25:
      MOVE_16_OBJECTS (in, out);
      MOVE_9_OBJECTS (in, out);
      break;
    case 26:
      MOVE_16_OBJECTS (in, out);
      MOVE_10_OBJECTS (in, out);
      break;
    case 27:
      MOVE_16_OBJECTS (in, out);
      MOVE_11_OBJECTS (in, out);
      break;
    case 28:
      MOVE_16_OBJECTS (in, out);
      MOVE_8_OBJECTS (in, out);
      MOVE_4_OBJECTS (in, out);
      break;
    case 29:
      MOVE_16_OBJECTS (in, out);
      MOVE_9_OBJECTS (in, out);
      MOVE_4_OBJECTS (in, out);
      break;
    case 30:
      MOVE_16_OBJECTS (in, out);
      MOVE_12_OBJECTS (in, out);
      MOVE_2_OBJECTS (in, out);
      break;
    case 31:
      MOVE_16_OBJECTS (in, out);
      MOVE_11_OBJECTS (in, out);
      MOVE_4_OBJECTS (in, out);
      break;
    }

  /* This loop governs the asmptoptic behaviour of this algorithm, for long
     word copies.  */
  count = value >> 5;
  for (loop_var = 0; loop_var < count; loop_var++)
    MOVE_32_OBJECTS (in, out);
}


static inline void
__byte_memcpy (void *__restrict s1, const void *__restrict s2, size_t n)
{
  int value = n;
  int loop_var;
  const char *in = s2;
  char *out = s1;
  int count;
  int m0,m1,m2,m3;

 /* This code currently give a stall for any value with a 1->2 in the low 5
    bits, i.e.  1,2, 33,34 ? not acceptable!  */
  switch (value & 0x1f)
    {
    case 0:
      break;
    case 1:
      MOVE_1_OBJECT (in, out);
      break;
    case 2:
      MOVE_2_OBJECTS (in, out);
      break;
    case 3:
      MOVE_3_OBJECTS (in, out);
      break;
    case 4:
      MOVE_4_OBJECTS (in, out);
      break;
    case 5:
      MOVE_5_OBJECTS (in, out);
      break;
    case 6:
      MOVE_6_OBJECTS (in, out);
      break;
    case 7:
      MOVE_7_OBJECTS (in, out);
      break;
    case 8:
      MOVE_8_OBJECTS (in, out);
      break;
    case 9:
      MOVE_9_OBJECTS (in, out);
      break;
    case 10:
      MOVE_10_OBJECTS (in, out);
      break;
    case 11:
      MOVE_11_OBJECTS (in, out);
      break;
    case 12:
      MOVE_12_OBJECTS (in, out);
      break;
    case 13:
      MOVE_9_OBJECTS (in, out);
      MOVE_4_OBJECTS (in, out);
      break;
    case 14:
      MOVE_12_OBJECTS (in, out);
      MOVE_2_OBJECTS (in, out);
      break;
    case 15:
      MOVE_11_OBJECTS (in, out);
      MOVE_4_OBJECTS (in, out);
      break;
    case 16:
      MOVE_16_OBJECTS (in, out);
      break;
    case 17:
      MOVE_11_OBJECTS (in, out);
      MOVE_6_OBJECTS (in, out);
      break;
    case 18:
      MOVE_9_OBJECTS (in, out);
      MOVE_9_OBJECTS (in, out);
      break;
    case 19:
      MOVE_16_OBJECTS (in, out);
      MOVE_3_OBJECTS (in, out);
      break;
    case 20:
      MOVE_16_OBJECTS (in, out);
      MOVE_4_OBJECTS (in, out);
      break;
    case 21:
      MOVE_16_OBJECTS (in, out);
      MOVE_5_OBJECTS (in, out);
      break;
    case 22:
      MOVE_16_OBJECTS (in, out);
      MOVE_6_OBJECTS (in, out);
      break;
    case 23:
      MOVE_16_OBJECTS (in, out);
      MOVE_7_OBJECTS (in, out);
      break;
    case 24:
      MOVE_16_OBJECTS (in, out);
      MOVE_8_OBJECTS (in, out);
      break;
    case 25:
      MOVE_16_OBJECTS (in, out);
      MOVE_9_OBJECTS (in, out);
      break;
    case 26:
      MOVE_16_OBJECTS (in, out);
      MOVE_10_OBJECTS (in, out);
      break;
    case 27:
      MOVE_16_OBJECTS (in, out);
      MOVE_11_OBJECTS (in, out);
      break;
    case 28:
      MOVE_16_OBJECTS (in, out);
      MOVE_8_OBJECTS (in, out);
      MOVE_4_OBJECTS (in, out);
      break;
    case 29:
      MOVE_16_OBJECTS (in, out);
      MOVE_9_OBJECTS (in, out);
      MOVE_4_OBJECTS (in, out);
      break;
    case 30:
      MOVE_16_OBJECTS (in, out);
      MOVE_12_OBJECTS (in, out);
      MOVE_2_OBJECTS (in, out);
      break;
    case 31:
      MOVE_16_OBJECTS (in, out);
      MOVE_11_OBJECTS (in, out);
      MOVE_4_OBJECTS (in, out);
      break;
    }

  /* This loop governs the asmptoptic behaviour of this algorithm, for long
     word copies.  */
  count = value >> 5;
  for (loop_var = 0; loop_var < count; loop_var++)
    MOVE_32_OBJECTS (in, out);
}


/* Exposed interface.  */

#ifndef __VISIUM_ARCH_BMI__

void
__long_int_memcpy (void *__restrict s1, const void *__restrict s2, size_t n)
{
  __int_memcpy (s1, s2, n);
}

#endif /* !__VISIUM_ARCH_BMI__ */

void
__wrd_memcpy (void *__restrict s1, const void *__restrict s2, size_t n)
{
  __shrt_int_memcpy (s1, s2, n);
}

void
__byt_memcpy (void *__restrict s1, const void *__restrict s2, size_t n)
{
  __byte_memcpy (s1, s2, n);
}