ef169f5707
Summary: This patch improves the implementation of the standard `rand()` function by implementing it in terms of the xorshift64star pRNG as described in https://en.wikipedia.org/wiki/Xorshift#xorshift*. This is a good, general purpose random number generator that is sufficient for most applications that do not require an extremely long period. This patch also correctly initializes the seed to be `1` as described by the standard. We also increase the `RAND_MAX` value to be `INT_MAX` as the standard only specifies that it can be larger than 32768.
23 lines
644 B
C
23 lines
644 B
C
//===-- Definition of macros to be used with stdlib functions ----------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef __LLVM_LIBC_MACROS_STDLIB_MACROS_H
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#define __LLVM_LIBC_MACROS_STDLIB_MACROS_H
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#ifndef NULL
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#define __need_NULL
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#include <stddef.h>
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#endif // NULL
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#define EXIT_SUCCESS 0
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#define EXIT_FAILURE 1
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#define RAND_MAX 2147483647
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#endif // __LLVM_LIBC_MACROS_STDLIB_MACROS_H
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