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55 lines
1.1 KiB
55 lines
1.1 KiB
/* |
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* IEEE754 floating point arithmetic |
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* single precision: CLASS.f |
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* FPR[fd] = class(FPR[fs]) |
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* |
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* MIPS floating point support |
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* Copyright (C) 2015 Imagination Technologies, Ltd. |
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* Author: Markos Chandras <markos.chandras@imgtec.com> |
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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 as published by the |
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* Free Software Foundation; version 2 of the License. |
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*/ |
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#include "ieee754sp.h" |
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int ieee754sp_2008class(union ieee754sp x) |
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{ |
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COMPXSP; |
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EXPLODEXSP; |
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/* |
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* 10 bit mask as follows: |
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* |
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* bit0 = SNAN |
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* bit1 = QNAN |
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* bit2 = -INF |
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* bit3 = -NORM |
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* bit4 = -DNORM |
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* bit5 = -ZERO |
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* bit6 = INF |
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* bit7 = NORM |
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* bit8 = DNORM |
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* bit9 = ZERO |
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*/ |
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switch(xc) { |
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case IEEE754_CLASS_SNAN: |
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return 0x01; |
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case IEEE754_CLASS_QNAN: |
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return 0x02; |
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case IEEE754_CLASS_INF: |
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return 0x04 << (xs ? 0 : 4); |
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case IEEE754_CLASS_NORM: |
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return 0x08 << (xs ? 0 : 4); |
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case IEEE754_CLASS_DNORM: |
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return 0x10 << (xs ? 0 : 4); |
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case IEEE754_CLASS_ZERO: |
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return 0x20 << (xs ? 0 : 4); |
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default: |
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pr_err("Unknown class: %d\n", xc); |
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return 0; |
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} |
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}
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