9989f41fd3
- add arm64 dependent codes with GICv3 and SVE support - fix bugs based on architecture separation requests
37 lines
464 B
C
37 lines
464 B
C
/* bitops-fls.h COPYRIGHT FUJITSU LIMITED 2015-2016 */
|
|
#ifndef INCLUDE_BITOPS_FLS_H
|
|
#define INCLUDE_BITOPS_FLS_H
|
|
|
|
static inline int fls(int x)
|
|
{
|
|
int r = 32;
|
|
if (!x) {
|
|
return 0;
|
|
}
|
|
|
|
if (!(x & 0xffff0000u)) {
|
|
x <<= 16;
|
|
r -= 16;
|
|
}
|
|
if (!(x & 0xff000000u)) {
|
|
x <<= 8;
|
|
r -= 8;
|
|
}
|
|
if (!(x & 0xf0000000u)) {
|
|
x <<= 4;
|
|
r -= 4;
|
|
}
|
|
if (!(x & 0xc0000000u)) {
|
|
x <<= 2;
|
|
r -= 2;
|
|
}
|
|
if (!(x & 0x80000000u)) {
|
|
x <<= 1;
|
|
r -= 1;
|
|
}
|
|
return r;
|
|
}
|
|
|
|
#endif
|
|
|