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ewah: implement bitmap_or()

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We have a function to bitwise-OR an ewah into an uncompressed bitmap,
but not to OR two uncompressed bitmaps. Let's add it.

Interestingly, we have a public header declaration going back to
e1273106f6 (ewah: compressed bitmap implementation, 2013-11-14), but the
function was never implemented. That was all OK since there were no
users of 'bitmap_or()', but a first caller will be added in a couple of
patches.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2020-12-08 17:03:46 -05:00 committed by Junio C Hamano
parent 2e2d141afd
commit 3ed675101a
1 changed files with 9 additions and 0 deletions
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9
ewah/bitmap.c
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@ -122,6 +122,15 @@ void bitmap_and_not(struct bitmap *self, struct bitmap *other)
self->words[i] &= ~other->words[i];
}
void bitmap_or(struct bitmap *self, const struct bitmap *other)
{
size_t i;
bitmap_grow(self, other->word_alloc);
for (i = 0; i < other->word_alloc; i++)
self->words[i] |= other->words[i];
}
void bitmap_or_ewah(struct bitmap *self, struct ewah_bitmap *other)
{
size_t original_size = self->word_alloc;