/* Floating point library in optimized assembly for 8051
 * Copyright (c) 2004, Paul Stoffregen, paul@pjrc.com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */


#define SDCC_FLOAT_LIB
#include <float.h>



#ifdef FLOAT_ASM_MCS51

// char __fs2schar (float x)
static void dummy(void) __naked
{
        __asm
        .globl  ___fs2schar
___fs2schar:
        lcall   ___fs2slong
        jnz     fs2schar_not_zero
        mov     a, dpl
        orl     a, dph
        orl     a, b
        jnz     fs2schar_clr_a
        ret
fs2schar_clr_a:
        clr a
fs2schar_not_zero:
        jnb     sign_a, fs2schar_pos
fs2schar_neg:
        cpl     a
        jnz     fs2schar_maxval_neg
        mov     a, b
        cpl     a
        jnz     fs2schar_maxval_neg
        mov     a, dph
        cpl     a
        jnz     fs2schar_maxval_neg
        mov     a, dpl
        jnb     acc.7, fs2schar_maxval_neg
        ret
fs2schar_maxval_neg:
        mov     dpl, #0x80
        ret
fs2schar_pos:
        jnz     fs2schar_maxval_pos
        mov     a, b
        jnz     fs2schar_maxval_pos
        mov     a, dph
        jnz     fs2schar_maxval_pos
        mov     a, dpl
        jb      acc.7, fs2schar_maxval_pos
        ret
fs2schar_maxval_pos:
        mov     dpl, #0x7F
        ret
        __endasm;
}

#else

/* convert float to signed char */
signed char __fs2schar (float f)
{
  signed long sl=__fs2slong(f);
  if (sl>=SCHAR_MAX)
    return SCHAR_MAX;
  if (sl<=SCHAR_MIN)
    return -SCHAR_MIN;
  return sl;
}

#endif
