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Diffstat (limited to 'source/ui64_to_extF80.c')
| -rw-r--r-- | source/ui64_to_extF80.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/source/ui64_to_extF80.c b/source/ui64_to_extF80.c new file mode 100644 index 0000000..9724174 --- /dev/null +++ b/source/ui64_to_extF80.c @@ -0,0 +1,56 @@ + +/*============================================================================ + +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 <stdint.h> +#include "platform.h" +#include "internals.h" +#include "softfloat.h" + +extFloat80_t ui64_to_extF80( uint64_t a ) +{ + uint_fast16_t uiZ64; + int_fast8_t shiftCount; + union { struct extFloat80M s; extFloat80_t f; } uZ; + + uiZ64 = 0; + if ( a ) { + shiftCount = softfloat_countLeadingZeros64( a ); + uiZ64 = 0x403E - shiftCount; + a <<= shiftCount; + } + uZ.s.signExp = uiZ64; + uZ.s.signif = a; + return uZ.f; + +} + |