mirror of
https://github.com/openhwgroup/cvw
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139 lines
3.5 KiB
C
139 lines
3.5 KiB
C
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/*============================================================================
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This C source file is part of TestFloat, Release 3e, a package of programs for
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testing the correctness of floating-point arithmetic complying with the IEEE
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Standard for Floating-Point, by John R. Hauser.
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Copyright 2011, 2012, 2013, 2014 The Regents of the University of California.
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions, and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions, and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3. Neither the name of the University nor the names of its contributors may
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be used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
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DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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=============================================================================*/
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#include <stdint.h>
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#include <stdlib.h>
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#include "platform.h"
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#include "random.h"
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uint_fast8_t random_ui8( void )
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{
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return rand()>>4 & 0xFF;
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}
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uint_fast16_t random_ui16( void )
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{
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return (rand() & 0x0FF0)<<4 | (rand()>>4 & 0xFF);
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}
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uint_fast32_t random_ui32( void )
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{
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return
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(uint_fast32_t) (rand() & 0x0FF0)<<20
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| (uint_fast32_t) (rand() & 0x0FF0)<<12
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| (rand() & 0x0FF0)<<4
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| (rand()>>4 & 0xFF);
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}
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uint_fast64_t random_ui64( void )
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{
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return (uint_fast64_t) random_ui32()<<32 | random_ui32();
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}
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uint_fast8_t randomN_ui8( uint_fast8_t N )
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{
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uint_fast8_t scale, z;
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scale = 0;
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while ( N < 0x80 ) {
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++scale;
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N <<= 1;
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}
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do {
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z = random_ui8();
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} while ( N <= z );
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return z>>scale;
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}
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uint_fast16_t randomN_ui16( uint_fast16_t N )
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{
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uint_fast16_t scale, z;
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scale = 0;
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while ( N < 0x8000 ) {
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++scale;
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N <<= 1;
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}
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do {
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z = random_ui16();
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} while ( N <= z );
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return z>>scale;
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}
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uint_fast32_t randomN_ui32( uint_fast32_t N )
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{
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uint_fast32_t scale, z;
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scale = 0;
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while ( N < 0x8000 ) {
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++scale;
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N <<= 1;
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}
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do {
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z = random_ui32();
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} while ( N <= z );
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return z>>scale;
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}
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uint_fast64_t randomN_ui64( uint_fast64_t N )
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{
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uint_fast64_t scale, z;
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scale = 0;
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while ( N < 0x8000 ) {
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++scale;
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N <<= 1;
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}
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do {
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z = random_ui64();
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} while ( N <= z );
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return z>>scale;
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}
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