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[libc] Add inline assembly implementation of flsl() using BSR instruction

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2014-04-24 14:49:08 +01:00
parent 8f0e0e1356
commit dce7107fc0
3 changed files with 33 additions and 15 deletions
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4
src/include/strings.h
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@@ -5,6 +5,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
#include <limits.h>
#include <string.h>
#include <bits/strings.h>
static inline __attribute__ (( always_inline )) int
__constant_flsl ( unsigned long x ) {
@@ -42,8 +43,7 @@ __constant_flsl ( unsigned long x ) {
return r;
}
/* We don't actually have these functions yet */
extern int __flsl ( long x );
int __flsl ( long x );
#define flsl( x ) \
( __builtin_constant_p ( x ) ? __constant_flsl ( x ) : __flsl ( x ) )