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| author | Richard Henderson <rth@twiddle.net> | 2013-02-13 17:47:39 -0800 |
|---|---|---|
| committer | Blue Swirl <blauwirbel@gmail.com> | 2013-02-16 11:12:21 +0000 |
| commit | 0cfa6adc7fd1eba4694515bde6bbfb9ecd892f2f (patch) | |
| tree | 16016d943c5821c74febe81c0487480247514f23 | |
| parent | 5bbf90be97203c472f47da070c0040b464c0460f (diff) | |
| download | qemu-0cfa6adc7fd1eba4694515bde6bbfb9ecd892f2f.tar.gz | |
bitops: Write bitops_flsl in terms of clzl
Signed-off-by: Richard Henderson <rth@twiddle.net>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
| -rw-r--r-- | include/qemu/bitops.h | 29 |
1 files changed, 1 insertions, 28 deletions
diff --git a/include/qemu/bitops.h b/include/qemu/bitops.h index 8b88791862..b50629bb58 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); } /** |