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Diffstat (limited to 'source/f64_sub.c')
| -rw-r--r-- | source/f64_sub.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/source/f64_sub.c b/source/f64_sub.c new file mode 100644 index 0000000..e229574 --- /dev/null +++ b/source/f64_sub.c @@ -0,0 +1,61 @@ + +/*============================================================================ + +This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic +Package, Release 3, by John R. Hauser. + +Copyright 2011, 2012, 2013, 2014 The Regents of the University of California +(Regents). All Rights Reserved. Redistribution and use in source and binary +forms, with or without modification, are permitted provided that the following +conditions are met: + +Redistributions of source code must retain the above copyright notice, +this list of conditions, and the following two paragraphs of disclaimer. +Redistributions in binary form must reproduce the above copyright notice, +this list of conditions, and the following two paragraphs of disclaimer in the +documentation and/or other materials provided with the distribution. Neither +the name of the Regents nor the names of its contributors may be used to +endorse or promote products derived from this software without specific prior +written permission. + +IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, +SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING +OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF REGENTS HAS +BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED +TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR +PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF ANY, PROVIDED +HEREUNDER IS PROVIDED "AS IS". REGENTS HAS NO OBLIGATION TO PROVIDE +MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. + +=============================================================================*/ + +#include <stdbool.h> +#include <stdint.h> +#include "platform.h" +#include "internals.h" +#include "softfloat.h" + +float64_t f64_sub( float64_t a, float64_t b ) +{ + union ui64_f64 uA; + uint_fast64_t uiA; + bool signA; + union ui64_f64 uB; + uint_fast64_t uiB; + bool signB; + float64_t (*magsFuncPtr)( uint_fast64_t, uint_fast64_t, bool ); + + uA.f = a; + uiA = uA.ui; + signA = signF64UI( uiA ); + uB.f = b; + uiB = uB.ui; + signB = signF64UI( uiB ); + magsFuncPtr = + (signA == signB) ? softfloat_subMagsF64 : softfloat_addMagsF64; + return (*magsFuncPtr)( uiA, uiB, signA ); + +} + |