| 2ee739cc |
1 | /* |
| 2 | * rand.h |
| 3 | * |
| 4 | * [Generated from rand, 25 September 1996] |
| 5 | */ |
| 6 | |
| 7 | #if !defined(__CC_NORCROFT) || !defined(__arm) |
| 8 | #error You must use the Norcroft ARM Compiler for Sapphire programs |
| 9 | #endif |
| 10 | |
| 11 | #pragma include_only_once |
| 12 | #pragma force_top_level |
| 13 | |
| 14 | #ifndef __rand_h |
| 15 | #define __rand_h |
| 16 | |
| 17 | #ifndef __sapphire_h |
| 18 | #include "sapphire.h" |
| 19 | #endif |
| 20 | |
| 21 | /*----- Overview ----------------------------------------------------------* |
| 22 | * |
| 23 | * Functions provided: |
| 24 | * |
| 25 | * rand |
| 26 | * rand_setSeed |
| 27 | * rnd |
| 28 | * rand_init |
| 29 | */ |
| 30 | |
| 31 | /* --- rand --- * |
| 32 | * |
| 33 | * On entry: -- |
| 34 | * |
| 35 | * On exit: R0 == a pseudorandom number between 0 and &7FFFFFFF |
| 36 | * |
| 37 | * Use: Returns a pseudorandom number. The algorithm used is the |
| 38 | * additive generator found in Knuth. The table is generated |
| 39 | * from the current monotonic time using a linear congruential |
| 40 | * generator. Randomness is fairly good, and it's very quick. |
| 41 | */ |
| 42 | |
| 43 | extern routine rand; |
| 44 | |
| 45 | /* --- rand_setSeed --- * |
| 46 | * |
| 47 | * On entry: R0 == a pseudorandom seed |
| 48 | * |
| 49 | * On exit: -- |
| 50 | * |
| 51 | * Use: Sets up the random number generator (rand) to the given start |
| 52 | * position. The table of values is initialised from the seed |
| 53 | * in a psuedorandom manner, using a linear congruential |
| 54 | * generator. |
| 55 | */ |
| 56 | |
| 57 | extern routine rand_setSeed; |
| 58 | |
| 59 | /* --- rnd --- * |
| 60 | * |
| 61 | * On entry: R0 == start value (inclusive) |
| 62 | * R1 == end value (inclusive) |
| 63 | * |
| 64 | * On exit: R0 == random number between the boundaries given |
| 65 | * |
| 66 | * Use: Returns a random integer between the boundaries given. |
| 67 | * The distribution is slightly skewed towards lower numbers, |
| 68 | * but there's not a lot I can do about this, folks. |
| 69 | */ |
| 70 | |
| 71 | extern routine rnd; |
| 72 | |
| 73 | /* --- rand_init --- * |
| 74 | * |
| 75 | * On entry: -- |
| 76 | * |
| 77 | * On exit: -- |
| 78 | * |
| 79 | * Use: Initialise the random number table. |
| 80 | */ |
| 81 | |
| 82 | extern routine rand_init; |
| 83 | |
| 84 | /*----- That's all, folks -------------------------------------------------*/ |
| 85 | |
| 86 | #endif |
~mdw / ssr / blame