Function compute_generation_offset

commit-graph.c:1341–1351

* Compute the generation offset between the commit date and its generation. * This is what's ultimately stored as generation number in the commit graph. * * Note that the computation of the commit date is more involved than you might * think. Instead of using the full commit date, we're in fact masking bits so * that only the 34 lowest bits are considered. This results from the fact that * c

 * bits.
 */
static timestamp_t compute_generation_offset(struct commit *c)
{
	timestamp_t masked_date;

	if (sizeof(timestamp_t) > 4)
		masked_date = c->date & (((timestamp_t) 1 << 34) - 1);
	else
		masked_date = c->date;

	return commit_graph_data_at(c)->generation - masked_date;
}

static int write_graph_chunk_generation_data(struct hashfile *f,
					     void *data)