[GSoC][PATCH 1/1] add zero count optimization in ewah_bitmap.c

From: Aryan Gupta <garyan447@gmail.com>
To: git@vger.kernel.org
Cc: Aryan Gupta <garyan447@gmail.com>
Subject: [GSoC][PATCH 1/1] add zero count optimization in ewah_bitmap.c
Date: Sun, 10 Mar 2024 17:26:14 +0100	[thread overview]
Message-ID: <20240310162614.62691-2-garyan447@gmail.com> (raw)
In-Reply-To: <20240310162614.62691-1-garyan447@gmail.com>

Signed-off-by: Aryan Gupta <garyan447@gmail.com>
---
 ewah/ewah_bitmap.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/ewah/ewah_bitmap.c b/ewah/ewah_bitmap.c
index 8785cbc54a..9056829572 100644
--- a/ewah/ewah_bitmap.c
+++ b/ewah/ewah_bitmap.c
@@ -257,10 +257,11 @@ void ewah_each_bit(struct ewah_bitmap *self, void (*callback)(size_t, void*), vo
 		for (k = 0; k < rlw_get_literal_words(word); ++k) {
 			int c;
 
-			/* todo: zero count optimization */
-			for (c = 0; c < BITS_IN_EWORD; ++c, ++pos) {
-				if ((self->buffer[pointer] & ((eword_t)1 << c)) != 0)
-					callback(pos, payload);
+			if(self->buffer[pointer]) {
+				for (c = 0; c < BITS_IN_EWORD; ++c, ++pos) {
+					if (((eword_t)1 << c) != 0)
+						callback(pos, payload);
+				}
 			}
 
 			++pointer;
-- 
2.25.1

