Stephen Rothwell wrote:
On Sun, 03 Apr 2005 13:55:39 +0200 Dag Arne Osvik <[email protected]> wrote:
I've been working on a new DES implementation for Linux, and ran into
the problem of how to get access to C99 types like uint_fast32_t for
internal (not interface) use. In my tests, key setup on Athlon 64 slows
down by 40% when using u32 instead of uint_fast32_t.
If you look in stdint.h you may find that uint_fast32_t is actually
64 bits on Athlon 64 ... so does it help if you use u64?
Yes, but wouldn't it be much better to avoid code like the following,
which may also be wrong (in terms of speed)?
#ifdef CONFIG_64BIT // or maybe CONFIG_X86_64?
#define fast_u32 u64
#else
#define fast_u32 u32
#endif
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
