diff options
Diffstat (limited to 'usr/src/uts/intel/asm/bitmap.h')
| -rw-r--r-- | usr/src/uts/intel/asm/bitmap.h | 24 |
1 files changed, 14 insertions, 10 deletions
diff --git a/usr/src/uts/intel/asm/bitmap.h b/usr/src/uts/intel/asm/bitmap.h index 6148277085..92020e39e3 100644 --- a/usr/src/uts/intel/asm/bitmap.h +++ b/usr/src/uts/intel/asm/bitmap.h @@ -48,29 +48,33 @@ extern "C" { extern __GNU_INLINE int highbit(ulong_t i) { - long value = -1l; + long value; + uint8_t zf; __asm__( - "bsr" __SUF " %1,%0" - : "+r" (value) - : "r" (i) + "bsr" __SUF " %2,%0;" + "setz %1" + : "=r" (value), "=q" (zf) + : "mr" (i) : "cc"); - return ((int)(value + 1)); + return (zf ? 0 : (value + 1)); } extern __GNU_INLINE int lowbit(ulong_t i) { - long value = -1l; + long value; + uint8_t zf; __asm__( - "bsf" __SUF " %1,%0" - : "+r" (value) - : "r" (i) + "bsf" __SUF " %2,%0;" + "setz %1" + : "=r" (value), "=q" (zf) + : "mr" (i) : "cc"); - return ((int)(value + 1)); + return (zf ? 0 : (value + 1)); } extern __GNU_INLINE uint_t |