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author | John Hauser <jhauser@eecs.berkeley.edu> | 2014-11-28 21:07:26 -0800 |
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committer | John Hauser <jhauser@eecs.berkeley.edu> | 2014-11-28 21:07:26 -0800 |
commit | d6feb3fa41c6b7ba1b5444ad147d8623138512c2 (patch) | |
tree | 09dd66c114bcc759fd86de0279c91a21d356235b /source/random.c | |
download | berkeley-testfloat-3-d6feb3fa41c6b7ba1b5444ad147d8623138512c2.zip berkeley-testfloat-3-d6feb3fa41c6b7ba1b5444ad147d8623138512c2.tar.gz berkeley-testfloat-3-d6feb3fa41c6b7ba1b5444ad147d8623138512c2.tar.bz2 |
First draft of RC for Release 3, to start review process.
Diffstat (limited to 'source/random.c')
-rw-r--r-- | source/random.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/source/random.c b/source/random.c new file mode 100644 index 0000000..fbf3408 --- /dev/null +++ b/source/random.c @@ -0,0 +1,135 @@ + +/*============================================================================ + +This C source file is part of TestFloat, Release 3, a package of programs for +testing the correctness of floating-point arithmetic complying with the IEEE +Standard for Floating-Point, 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 <stdlib.h> +#include "platform.h" +#include "random.h" + +uint_fast8_t random_ui8( void ) +{ + + return rand()>>4 & 0xFF; + +} + +uint_fast16_t random_ui16( void ) +{ + + return (rand() & 0x0FF0)<<4 | (rand()>>4 & 0xFF); + +} + +uint_fast32_t random_ui32( void ) +{ + + return + (uint_fast32_t) (rand() & 0x0FF0)<<20 + | (uint_fast32_t) (rand() & 0x0FF0)<<12 + | (rand() & 0x0FF0)<<4 + | (rand()>>4 & 0xFF); + +} + +uint_fast64_t random_ui64( void ) +{ + + return (uint_fast64_t) random_ui32()<<32 | random_ui32(); + +} + +uint_fast8_t randomN_ui8( uint_fast8_t N ) +{ + uint_fast8_t scale, z; + + scale = 0; + while ( N < 0x80 ) { + ++scale; + N <<= 1; + } + do { + z = random_ui8(); + } while ( N <= z ); + return z>>scale; + +} + +uint_fast16_t randomN_ui16( uint_fast16_t N ) +{ + uint_fast16_t scale, z; + + scale = 0; + while ( N < 0x8000 ) { + ++scale; + N <<= 1; + } + do { + z = random_ui16(); + } while ( N <= z ); + return z>>scale; + +} + +uint_fast32_t randomN_ui32( uint_fast32_t N ) +{ + uint_fast32_t scale, z; + + scale = 0; + while ( N < 0x8000 ) { + ++scale; + N <<= 1; + } + do { + z = random_ui32(); + } while ( N <= z ); + return z>>scale; + +} + +uint_fast64_t randomN_ui64( uint_fast64_t N ) +{ + uint_fast64_t scale, z; + + scale = 0; + while ( N < 0x8000 ) { + ++scale; + N <<= 1; + } + do { + z = random_ui64(); + } while ( N <= z ); + return z>>scale; + +} + |