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// 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 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; }