reg_convert.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:2k
- /*---------------------------------------------------------------------------+
- | reg_convert.c |
- | |
- | Convert register representation. |
- | |
- | Copyright (C) 1992,1993,1994,1996,1997 |
- | W. Metzenthen, 22 Parker St, Ormond, Vic 3163, Australia |
- | E-mail billm@suburbia.net |
- | |
- | |
- +---------------------------------------------------------------------------*/
- #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;
- }