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Mostly functional cache_access

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Adam Goldsmith 2016-04-28 01:43:56 -04:00
parent 27b90ae3ed
commit 9997f58137
1 changed files with 39 additions and 0 deletions
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39
csim.c
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@ -52,6 +52,7 @@ void free_cache(linked_line** cache, long num_sets);
void free_set(linked_line* line);
void print_cache(linked_line** cache, long num_sets);
void print_set(linked_line* line);
char cache_access(linked_line** cache, long address, int set_bits, int block_bits, long num_lines);
linked_line* find_line(linked_line* set_head, long tag);
void increment_result_counters(char result, results* score);
@ -131,6 +132,12 @@ int main(int argc, char* argv[])
printf("%c %ld\n", op, address);
print_cache(cache, set_indices);
char r = cache_access(cache, address, set_index_bits, block_bits, num_lines);
increment_result_counters(r, &score);
if (op == 'M') { //Access again if modifying
r = cache_access(cache, address, set_index_bits, block_bits, num_lines);
increment_result_counters(r, &score);
}
}
printSummary(score.hits, score.misses, score.evictions);
@ -215,6 +222,38 @@ void print_set(linked_line* line)
}
}
char cache_access(linked_line** cache, long address, int set_bits, int block_bits, long num_lines)
{
char out;
long tag = address >> set_bits >> block_bits;
long set = (address >> block_bits) & ((1 << set_bits) - 1);
linked_line* set_head = cache[set];
linked_line* line = find_line(set_head, tag);
if (!line->validity) out = 'M';
else if (line->tag == tag) out = 'H';
else out = 'E';
if (line != set_head) {
line->newer = NULL;
set_head->newer = line;
line->older = set_head;
if (line->older) {
line->older->newer = line->newer;
if (line->older->older == line)
line->older->older = NULL;
}
if (line->newer)
line->newer->older = line->older;
cache[set] = line;
}
line->tag = tag;
line->validity = 1;
return out;
}
/**
@returns the first line with a matching tag, the first invalid line,
or the first line without an older (i.e. the end of the set