From 0cfa6adc7fd1eba4694515bde6bbfb9ecd892f2f Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Wed, 13 Feb 2013 17:47:39 -0800 Subject: [PATCH] bitops: Write bitops_flsl in terms of clzl Signed-off-by: Richard Henderson Reviewed-by: Eric Blake Signed-off-by: Blue Swirl --- include/qemu/bitops.h | 29 +---------------------------- 1 file changed, 1 insertion(+), 28 deletions(-) diff --git a/include/qemu/bitops.h b/include/qemu/bitops.h index 8b88791..b50629b 100644 --- a/include/qemu/bitops.h +++ b/include/qemu/bitops.h @@ -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); } /** -- 2.7.4