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use a compiler builtin (which uses processor instructions) for this operation

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@33933 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Kevin P. Fleming
2006-06-13 20:59:15 +00:00
parent a6d0d04141
commit fca19e7635
2 changed files with 14 additions and 11 deletions
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11
channels/chan_agent.c
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@@ -1334,12 +1334,13 @@ static struct ast_channel *agent_request(const char *type, int format, void *dat
return chan; return chan;
} }
static int powerof(unsigned int v) static force_inline int powerof(unsigned int d)
{ {
int x; int x = ffs(d);
for (x=0;x<32;x++) {
if (v & (1 << x)) return x; if (x)
} return x - 1;
return 0; return 0;
} }

14
translate.c
View File

@@ -74,13 +74,15 @@ static struct translator_path tr_matrix[MAX_FORMAT][MAX_FORMAT];
*/ */
/*! \brief returns the index of the lowest bit set */ /*! \brief returns the index of the lowest bit set */
static int powerof(int d) static force_inline int powerof(unsigned int d)
{ {
int x; int x = ffs(d);
for (x = 0; x < MAX_FORMAT; x++)
if ((1 << x) & d) if (x)
return x; return x - 1;
ast_log(LOG_WARNING, "Powerof %d: No power??\n", d);
ast_log(LOG_WARNING, "No bits set? %d\n", d);
return -1; return -1;
} }