Commit 0cfa6adc authored by Richard Henderson's avatar Richard Henderson Committed by Blue Swirl
Browse files

bitops: Write bitops_flsl in terms of clzl 



Signed-off-by: default avatarRichard Henderson <rth@twiddle.net>
Reviewed-by: default avatarEric Blake <eblake@redhat.com>
Signed-off-by: default avatarBlue Swirl <blauwirbel@gmail.com>
parent 5bbf90be

include/qemu/bitops.h

+1 −28
Original line number Diff line number Diff line
@@ -57,34 +57,7 @@ static unsigned long bitops_ctzl(unsigned long word) 
 */

static inline unsigned long bitops_flsl(unsigned long word)

{

	int num = BITS_PER_LONG - 1;



#if LONG_MAX > 0x7FFFFFFF

	if (!(word & (~0ul << 32))) {

		num -= 32;

		word <<= 32;

	}

#endif

	if (!(word & (~0ul << (BITS_PER_LONG-16)))) {

		num -= 16;

		word <<= 16;

	}

	if (!(word & (~0ul << (BITS_PER_LONG-8)))) {

		num -= 8;

		word <<= 8;

	}

	if (!(word & (~0ul << (BITS_PER_LONG-4)))) {

		num -= 4;

		word <<= 4;

	}

	if (!(word & (~0ul << (BITS_PER_LONG-2)))) {

		num -= 2;



		word <<= 2;

	}

	if (!(word & (~0ul << (BITS_PER_LONG-1))))

		num -= 1;

	return num;

    return BITS_PER_LONG - 1 - clzl(word);

}



/**