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[libc] Add flsll()

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2014-04-27 16:11:44 +01:00
parent 3ffd309375
commit d36e814b8a
4 changed files with 112 additions and 7 deletions
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15
src/include/strings.h
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@@ -8,15 +8,13 @@ FILE_LICENCE ( GPL2_OR_LATER );
#include <bits/strings.h>
static inline __attribute__ (( always_inline )) int
__constant_flsl ( unsigned long x ) {
__constant_flsll ( unsigned long long x ) {
int r = 0;
#if ULONG_MAX > 0xffffffff
if ( x & 0xffffffff00000000UL ) {
if ( x & 0xffffffff00000000ULL ) {
x >>= 32;
r += 32;
}
#endif
if ( x & 0xffff0000UL ) {
x >>= 16;
r += 16;
@@ -43,8 +41,17 @@ __constant_flsl ( unsigned long x ) {
return r;
}
static inline __attribute__ (( always_inline )) int
__constant_flsl ( unsigned long x ) {
return __constant_flsll ( x );
}
int __flsll ( long long x );
int __flsl ( long x );
#define flsll( x ) \
( __builtin_constant_p ( x ) ? __constant_flsll ( x ) : __flsll ( x ) )
#define flsl( x ) \
( __builtin_constant_p ( x ) ? __constant_flsl ( x ) : __flsl ( x ) )