stk/Stack/libstack-ALPHA.c

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/******************************************************************************
*
* l i b s t a c k - A L P H A . c
*
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* Copyright <EFBFBD> 1997-1999 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr>
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*
*
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* Permission to use, copy, modify, distribute,and license this
* software and its documentation for any purpose is hereby granted,
* provided that existing copyright notices are retained in all
* copies and that this notice is included verbatim in any
* distributions. No written agreement, license, or royalty fee is
* required for any of the authorized uses.
* This software is provided ``AS IS'' without express or implied
* warranty.
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*
*
* Author: Erick Gallesio [eg@unice.fr]
* Creation date: 28-Sep-1997 17:30
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* Last file update: 3-Sep-1999 21:05 (eg)
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*
******************************************************************************/
/*
The first 6 arguments are passed in registers $16-$21 for integers,
in registers $f16-$f21 for floats. From then on, everything is passed
on the stack.
Everything on the stack is word-aligned.
*/
#include "libstack.h"
fake_type stk_argv[MAX_EXTERNAL_PARAM];
int stk_argc = 0;
extern void stk_copy_float_registers(void);
int stk_push_float(float f)
{
if (stk_argc < 6) {
/* Value must goes in a register, store it as a double */
stk_argv[stk_argc++].d=(double)f;
return 0;
}
if (stk_argc < MAX_EXTERNAL_PARAM) {
/* Value will be stacked as a float */
stk_argv[stk_argc++].f[0]=f;
return 0;
}
return -1;
}
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/* Since we do not know how many floats are passed (and where), we set all
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* float registers before calling the function
*/
#define alpha_big_switch {stk_copy_float_registers(); big_switch;}
long stk_call_long(void *func)
{
long (*f)() = func;
alpha_big_switch;
}
double stk_call_double(void *func)
{
double (*f)() = func;
alpha_big_switch;
}
float stk_call_float(void *func)
{
float (*f)() = func;
alpha_big_switch;
}