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[v4,08/24] ewah: implement bitmap_or()

Message ID 04bf0de4742386b2c5bce7bbfdb07cbaefc637c8.1607464775.git.me@ttaylorr.com (mailing list archive)
State New, archived
Headers show
Series pack-bitmap: bitmap generation improvements | expand

Commit Message

Taylor Blau Dec. 8, 2020, 10:03 p.m. UTC 
From: Jeff King <peff@peff.net>

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>
---
 ewah/bitmap.c | 9 +++++++++
 1 file changed, 9 insertions(+)
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Patch

diff --git a/ewah/bitmap.c b/ewah/bitmap.c
index 6f9e5c529b..0a3502603f 100644
--- a/ewah/bitmap.c
+++ b/ewah/bitmap.c
@@ -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;