| /*---------------------------------------------------------------------------+ |
| | 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; |
| } |
