--- /dev/null
+/* Licensed under LGPLv2.1+ - see LICENSE file for details */
+#include "bitops.h"
+#include "config.h"
+#include <ccan/build_assert/build_assert.h>
+#include <ccan/short_types/short_types.h>
+#include <ccan/ilog/ilog.h>
+#include <limits.h>
+
+unsigned int afls(unsigned long val)
+{
+ BUILD_ASSERT(sizeof(val) == sizeof(u32) || sizeof(val) == sizeof(u64));
+ if (sizeof(val) == sizeof(u32))
+ return ilog32(val);
+ else
+ return ilog64(val);
+}
+
+/* FIXME: Move to bitops. */
+unsigned int affsl(unsigned long val)
+{
+#if HAVE_BUILTIN_FFSL
+ /* This is significantly faster! */
+ return __builtin_ffsl(val);
+#else
+ unsigned int r = 1;
+
+ if (!val)
+ return 0;
+ if (sizeof(long) == sizeof(u64)) {
+ if (!(val & 0xffffffff)) {
+ /* Workaround gcc warning on 32-bit:
+ error: right shift count >= width of type */
+ u64 tmp = val;
+ tmp >>= 32;
+ val = tmp;
+ r += 32;
+ }
+ }
+ if (!(val & 0xffff)) {
+ val >>= 16;
+ r += 16;
+ }
+ if (!(val & 0xff)) {
+ val >>= 8;
+ r += 8;
+ }
+ if (!(val & 0xf)) {
+ val >>= 4;
+ r += 4;
+ }
+ if (!(val & 3)) {
+ val >>= 2;
+ r += 2;
+ }
+ if (!(val & 1)) {
+ val >>= 1;
+ r += 1;
+ }
+ return r;
+#endif
+}
+
+unsigned int popcount(unsigned long val)
+{
+#if HAVE_BUILTIN_POPCOUNTL
+ return __builtin_popcountl(val);
+#else
+ if (sizeof(long) == sizeof(u64)) {
+ u64 v = val;
+ v = (v & 0x5555555555555555ULL)
+ + ((v >> 1) & 0x5555555555555555ULL);
+ v = (v & 0x3333333333333333ULL)
+ + ((v >> 2) & 0x3333333333333333ULL);
+ v = (v & 0x0F0F0F0F0F0F0F0FULL)
+ + ((v >> 4) & 0x0F0F0F0F0F0F0F0FULL);
+ v = (v & 0x00FF00FF00FF00FFULL)
+ + ((v >> 8) & 0x00FF00FF00FF00FFULL);
+ v = (v & 0x0000FFFF0000FFFFULL)
+ + ((v >> 16) & 0x0000FFFF0000FFFFULL);
+ v = (v & 0x00000000FFFFFFFFULL)
+ + ((v >> 32) & 0x00000000FFFFFFFFULL);
+ return v;
+ }
+ val = (val & 0x55555555ULL) + ((val >> 1) & 0x55555555ULL);
+ val = (val & 0x33333333ULL) + ((val >> 2) & 0x33333333ULL);
+ val = (val & 0x0F0F0F0FULL) + ((val >> 4) & 0x0F0F0F0FULL);
+ val = (val & 0x00FF00FFULL) + ((val >> 8) & 0x00FF00FFULL);
+ val = (val & 0x0000FFFFULL) + ((val >> 16) & 0x0000FFFFULL);
+ return val;
+#endif
+}
+
+unsigned long align_up(unsigned long x, unsigned long align)
+{
+ return (x + align - 1) & ~(align - 1);
+}