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75 lines
1.7 KiB
75 lines
1.7 KiB
/* IEEE754 floating point arithmetic |
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* double precision: common utilities |
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*/ |
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/* |
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* MIPS floating point support |
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* Copyright (C) 1994-2000 Algorithmics Ltd. |
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* |
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* This program is free software; you can distribute it and/or modify it |
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* under the terms of the GNU General Public License (Version 2) as |
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* published by the Free Software Foundation. |
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* |
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* This program is distributed in the hope it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* for more details. |
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* |
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* You should have received a copy of the GNU General Public License along |
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* with this program; if not, write to the Free Software Foundation, Inc., |
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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*/ |
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#include "ieee754sp.h" |
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#include "ieee754dp.h" |
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static inline union ieee754dp ieee754dp_nan_fsp(int xs, u64 xm) |
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{ |
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return builddp(xs, DP_EMAX + 1 + DP_EBIAS, |
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xm << (DP_FBITS - SP_FBITS)); |
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} |
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union ieee754dp ieee754dp_fsp(union ieee754sp x) |
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{ |
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COMPXSP; |
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EXPLODEXSP; |
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ieee754_clearcx(); |
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FLUSHXSP; |
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switch (xc) { |
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case IEEE754_CLASS_SNAN: |
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return ieee754dp_nanxcpt(ieee754dp_nan_fsp(xs, xm)); |
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case IEEE754_CLASS_QNAN: |
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return ieee754dp_nan_fsp(xs, xm); |
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case IEEE754_CLASS_INF: |
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return ieee754dp_inf(xs); |
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case IEEE754_CLASS_ZERO: |
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return ieee754dp_zero(xs); |
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case IEEE754_CLASS_DNORM: |
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/* normalize */ |
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while ((xm >> SP_FBITS) == 0) { |
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xm <<= 1; |
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xe--; |
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} |
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break; |
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case IEEE754_CLASS_NORM: |
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break; |
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} |
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/* |
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* Can't possibly overflow,underflow, or need rounding |
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*/ |
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/* drop the hidden bit */ |
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xm &= ~SP_HIDDEN_BIT; |
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return builddp(xs, xe + DP_EBIAS, |
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(u64) xm << (DP_FBITS - SP_FBITS)); |
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}
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