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Diffstat (limited to 'lib/igt_rand.h')
-rw-r--r-- | lib/igt_rand.h | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/lib/igt_rand.h b/lib/igt_rand.h new file mode 100644 index 00000000..d676752d --- /dev/null +++ b/lib/igt_rand.h @@ -0,0 +1,39 @@ +/* + * Copyright © 2016 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + */ + +#ifndef IGT_RAND_H +#define IGT_RAND_H + +#include <stdint.h> + +uint32_t hars_petruska_f54_1_random_seed(uint32_t seed); +uint32_t hars_petruska_f54_1_random_unsafe(void); + +static inline void hars_petruska_f54_1_random_perturb(uint32_t xor) +{ + uint32_t seed = hars_petruska_f54_1_random_seed(0) ^ xor; + hars_petruska_f54_1_random_seed(seed); + hars_petruska_f54_1_random_seed(hars_petruska_f54_1_random_unsafe()); +} + +#endif /* IGT_RAND_H */ |