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bitmap:improve memory usage using CHAR_BITS and unsigned CHAR

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Using char instead of int allows for simpler definitions of the
DOCIDSET macros so the code is easier to understand and consistent with
respect to memory-usage. Estimated reduction of memory-usage for
bitmap about 8 times.
This commit is contained in:
Robert Mast 2013-02-13 16:32:57 +01:00 committed by David Bremner
parent a03769db17
commit c033cb4c07
1 changed files with 5 additions and 5 deletions
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10
lib/query.cc
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@ -39,12 +39,12 @@ typedef struct _notmuch_mset_messages {
} notmuch_mset_messages_t;
struct _notmuch_doc_id_set {
unsigned int *bitmap;
unsigned char *bitmap;
unsigned int bound;
};
#define DOCIDSET_WORD(bit) ((bit) / sizeof (unsigned int))
#define DOCIDSET_BIT(bit) ((bit) % sizeof (unsigned int))
#define DOCIDSET_WORD(bit) ((bit) / CHAR_BIT)
#define DOCIDSET_BIT(bit) ((bit) % CHAR_BIT)
struct visible _notmuch_threads {
notmuch_query_t *query;
@ -359,11 +359,11 @@ _notmuch_doc_id_set_init (void *ctx,
GArray *arr)
{
unsigned int max = 0;
unsigned int *bitmap;
unsigned char *bitmap;
for (unsigned int i = 0; i < arr->len; i++)
max = MAX(max, g_array_index (arr, unsigned int, i));
bitmap = talloc_zero_array (ctx, unsigned int, 1 + max / sizeof (*bitmap));
bitmap = talloc_zero_array (ctx, unsigned char, DOCIDSET_WORD(max) + 1);
if (bitmap == NULL)
return FALSE;