slimes.c

/*
Copyright (c) 2014 Timothy Goddard

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 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.
*/

#define MAX_SEED (1L << 48)
#define NUM_THREADS 32
#define BLOCK_SIZE 8388608L

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>

#include "slime_chunks.h"
#include "slime_algo.h"

const static unsigned long mask_48bit = (1L << 48) - 1L;
const static unsigned long mask_31bit = (1L << 31) - 1L;
const static unsigned long mask_17bit = (1L << 17) - 1L;

#ifdef LOWER_BIT_PREFILTER
unsigned int *lower_bits_series;
unsigned int lower_bits_count;
#endif

typedef struct {
  unsigned int block_counter;
  unsigned long start_seed;
  unsigned long end_seed;
  chunk_list_t chunks;
} run_state;

void *processing_thread(void* data) {
  run_state *state = (run_state*) data;
  
  while (1) {
    unsigned int block = __sync_fetch_and_add(&(state->block_counter), 1);
    unsigned long my_start = state->start_seed + ((long) block * BLOCK_SIZE);
    unsigned long my_end = my_start + BLOCK_SIZE;
    
    if (my_start >= state->end_seed || my_end < my_start) {
      pthread_exit(0);
    }
    
    unsigned long root;
#ifdef LOWER_BIT_PREFILTER
    for (root = (my_start >> 18); root < (my_end >> 18); ++root) {
      unsigned int lv;
      for (lv = 0; lv < lower_bits_count; ++lv) {
      unsigned long seed = (root << 18) | lower_bits_series[lv];
#else
    for (root = my_start; root < my_end; ++root) {
#ifdef SEED_TRANSFORM
      unsigned long seed = seed_transform(root, state->chunk_values[0]);
#else
      unsigned long seed = root;
#endif
#endif
      int hits = 0;
      unsigned int chunk;
      for (chunk = 0; chunk < state->chunks.num_chunks; ++chunk) {
        unsigned long random = ((seed + state->chunks.chunk_values[chunk]) ^ 0x5e434e432) & mask_48bit;
        random = (((random * 0x5DEECE66DL) + 0xBUL) & mask_48bit) >> 17;
        int are_slimes = random % 10 == 0;
        if (are_slimes) {
          hits += 1;
        }
        if (chunk + 1 - hits > state->chunks.num_chunks - state->chunks.required_hits) {
          break;
        }
      }
      if (hits >= state->chunks.required_hits) {
        printf("%ld\n", seed);
        fflush(stdout);
      }
#ifdef LOWER_BIT_PREFILTER
      }
#endif
    }
  }
}

int main(int argc, char** argv) {
  chunk_list_t chunks = read_chunk_list_file("chunks.txt");
  //debug_slime_chunks(&chunks);
  
#ifdef LOWER_BIT_PREFILTER
  calculate_lower_bits_series(chunks.chunk_values, chunks.num_chunks, chunks.required_hits, &lower_bits_series, &lower_bits_count);
  
  fprintf(stderr, "Filtering to %d options for lower 18 bits (%0.9f%%)\n", lower_bits_count, (double) lower_bits_count / (double) 262144);
#endif
  
  run_state state;
  state.block_counter = 0;
  state.chunks = chunks;
  
  state.start_seed = 0;
  state.end_seed = (1L << 48);
  
  pthread_t threads[NUM_THREADS];
  unsigned int i;
  for (i = 0; i < NUM_THREADS; ++i) {
    pthread_create(&threads[i], NULL, processing_thread, (void*) &state);
  }
  
  for (i = 0; i < NUM_THREADS; ++i) {
    pthread_join(threads[i], NULL);
  }
  
  return 0;
}