mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
47 lines
1.6 KiB
47 lines
1.6 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/*---------------------------------------------------------------------------+ |
|
| reg_convert.c | |
|
| | |
|
| Convert register representation. | |
|
| | |
|
| Copyright (C) 1992,1993,1994,1996,1997 | |
|
| W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia | |
|
| E-mail [email protected] | |
|
| | |
|
| | |
|
+---------------------------------------------------------------------------*/ |
|
|
|
#include "exception.h" |
|
#include "fpu_emu.h" |
|
|
|
int FPU_to_exp16(FPU_REG const *a, FPU_REG *x) |
|
{ |
|
int sign = getsign(a); |
|
|
|
*(long long *)&(x->sigl) = *(const long long *)&(a->sigl); |
|
|
|
/* Set up the exponent as a 16 bit quantity. */ |
|
setexponent16(x, exponent(a)); |
|
|
|
if (exponent16(x) == EXP_UNDER) { |
|
/* The number is a de-normal or pseudodenormal. */ |
|
/* We only deal with the significand and exponent. */ |
|
|
|
if (x->sigh & 0x80000000) { |
|
/* Is a pseudodenormal. */ |
|
/* This is non-80486 behaviour because the number |
|
loses its 'denormal' identity. */ |
|
addexponent(x, 1); |
|
} else { |
|
/* Is a denormal. */ |
|
addexponent(x, 1); |
|
FPU_normalize_nuo(x); |
|
} |
|
} |
|
|
|
if (!(x->sigh & 0x80000000)) { |
|
EXCEPTION(EX_INTERNAL | 0x180); |
|
} |
|
|
|
return sign; |
|
}
|
|
|