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Diffstat (limited to 'src/base/random.cc')
-rw-r--r-- | src/base/random.cc | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/src/base/random.cc b/src/base/random.cc new file mode 100644 index 000000000..e135b55f5 --- /dev/null +++ b/src/base/random.cc @@ -0,0 +1,100 @@ +/* + * Copyright (c) 2003-2005 The Regents of The University of Michigan + * 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 disclaimer; + * redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Authors: Nathan Binkert + * Ali Saidi + */ + +#include <cstdlib> +#include <cmath> + +#include "sim/param.hh" +#include "base/random.hh" +#include "base/trace.hh" + +using namespace std; + +class RandomContext : public ParamContext +{ + public: + RandomContext(const string &_iniSection) + : ::ParamContext(_iniSection) {} + ~RandomContext() {} + + void checkParams(); +}; + +RandomContext paramContext("random"); + +Param<unsigned> +seed(¶mContext, "seed", "seed to random number generator", 1); + +void +RandomContext::checkParams() +{ + ::srand48(seed); +} + +long +getLong() +{ + return mrand48(); +} + +int64_t +getUniform(int64_t min, int64_t max) +{ + double r; + r = drand48() * (max-min) + min; + return (int64_t)round(r); +} + +uint64_t +getUniformPos(uint64_t min, uint64_t max) +{ + double r; + r = drand48() * (max-min) + min; + return (uint64_t)round(r); +} + + +// idea for generating a double from erand48 +double +getDouble() +{ + union { + uint32_t _long[2]; + uint16_t _short[4]; + }; + + _long[0] = mrand48(); + _long[1] = mrand48(); + + return ldexp((double) _short[0], -48) + + ldexp((double) _short[1], -32) + + ldexp((double) _short[2], -16); +} |