v4.1:
Update bitmap_count1 function: call count_1bits to improve
performance.
v4:
Add bitmap_count1 function to count all 1 bits.
---
lib/bitmap.c | 15 +++++++++++++++
lib/bitmap.h | 1 +
2 files changed, 16 insertions(+), 0 deletions(-)
diff --git a/lib/bitmap.c b/lib/bitmap.c
index ac568e9..655b0a2 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -17,6 +17,7 @@
#include <config.h>
#include "bitmap.h"
#include <string.h>
+#include "util.h"
/* Allocates and returns a bitmap initialized to all-1-bits. */
unsigned long *
@@ -92,3 +93,17 @@ bitmap_scan(const unsigned long int *bitmap, size_t start,
size_t end)
}
return i;
}
+
+size_t
+bitmap_count1(const unsigned long int *bitmap, size_t end)
+{
+ size_t i;
+ size_t count = 0;
+
+ BUILD_ASSERT(ULONG_MAX <= UINT64_MAX);
+ for (i = 0; i < BITMAP_N_LONGS(end); i++) {
+ count += count_1bits(bitmap[i]);
+ }
+
+ return count;
+}
diff --git a/lib/bitmap.h b/lib/bitmap.h
index 645f15f..5e6f8ed 100644
--- a/lib/bitmap.h
+++ b/lib/bitmap.h
@@ -101,6 +101,7 @@ void bitmap_set_multiple(unsigned long *, size_t start,
size_t count,
bool value);
bool bitmap_equal(const unsigned long *, const unsigned long *, size_t n);
size_t bitmap_scan(const unsigned long int *, size_t start, size_t end);
+size_t bitmap_count1(const unsigned long *, size_t n);
#define BITMAP_FOR_EACH_1(IDX, SIZE, BITMAP) \
for ((IDX) = bitmap_scan(BITMAP, 0, SIZE); (IDX) < (SIZE); \
--
1.7.3.1.msysgit.0
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