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/******************************** -*- C -*- ****************************
*
* Sample RPN calculator using GNU lightning and floating-point
*
***********************************************************************/
/***********************************************************************
*
* Copyright 2000, 2004 Free Software Foundation, Inc.
* Written by Paolo Bonzini.
*
* This file is part of GNU lightning.
*
* GNU lightning 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, or (at your option)
* any later version.
*
* GNU lightning 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 GNU lightning; see the file COPYING.LESSER; if not, write to the
* Free Software Foundation, 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*
***********************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include "lightning.h"
static jit_insn codeBuffer[1024];
typedef double (*pdfd) (double); /* Pointer to Double Function of Double */
static int regs[6] = { JIT_FPR0, JIT_FPR1, JIT_FPR2, JIT_FPR3, JIT_FPR4, JIT_FPR5 };
pdfd
compile_rpn (char *expr)
{
pdfd fn;
int ofs, sp = 1;
fn = (pdfd) (jit_get_ip ().dptr);
jit_leaf (1);
ofs = jit_arg_d ();
jit_getarg_d (regs[0], ofs);
while (*expr)
{
char buf[32];
int n;
/* This scanner is much less advanced than the one in rpn.c. */
if (sscanf (expr, "%[0-9]%n", buf, &n))
{
double d = strtod (buf, NULL);
expr += n - 1;
jit_movi_d (regs[sp], d);
sp++;
}
else if (*expr == '+')
{
jit_addr_d (regs[sp - 2], regs[sp - 2], regs[sp - 1]);
sp--;
}
else if (*expr == '-')
{
jit_subr_d (regs[sp - 2], regs[sp - 2], regs[sp - 1]);
sp--;
}
else if (*expr == '*')
{
jit_mulr_d (regs[sp - 2], regs[sp - 2], regs[sp - 1]);
sp--;
}
else if (*expr == '/')
{
jit_divr_d (regs[sp - 2], regs[sp - 2], regs[sp - 1]);
sp--;
}
else
{
fprintf (stderr, "cannot compile: %s\n", expr);
abort ();
}
++expr;
}
jit_retval_d (regs[0]);
jit_ret ();
jit_flush_code ((char *) fn, jit_get_ip ().ptr);
#ifdef LIGHTNING_DISASSEMBLE
disassemble (stderr, (char *) fn, jit_get_ip ().ptr);
#endif
return fn;
}
int
main ()
{
pdfd c2f, f2c;
double i;
jit_set_ip (codeBuffer);
c2f = compile_rpn ("9*5/32+");
f2c = compile_rpn ("32-5*9/");
#ifndef LIGHTNING_CROSS
printf ("\nC:");
for (i = 0; i <= 100; i += 10)
printf ("%6.1f", i);
printf ("\nF:");
for (i = 0; i <= 100; i += 10)
printf ("%6.1f", c2f (i));
printf ("\n");
printf ("\nF:");
for (i = 32; i <= 212; i += 10)
printf ("%6.1f", i);
printf ("\nC:");
for (i = 32; i <= 212; i += 10)
printf ("%6.1f", f2c (i));
printf ("\n");
#endif
return 0;
}
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