TeaSpeak/tomcrypt
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Use __builtin_bswap64 if it is available

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This produces slightly better performance than the inline assembly,
and has the added benefit that it should be portable to other systems
that use gcc, not just x86-64.

Here are the results on my "AMD Athlon(tm) 7450 Dual-Core Processor"
with "gcc (Ubuntu 4.3.3-5ubuntu4) 4.3.3":

with portable 64H macros:

camellia            : Schedule at   1659
camellia            [ 23]: Encrypt at   431, Decrypt at   434
whirlpool           : Process at    55

with inline assembly (with "memory clobber" for correctness):

camellia            : Schedule at   1380
camellia            [ 23]: Encrypt at   406, Decrypt at   403
whirlpool           : Process at    50

with __builtin_bswap64:

camellia            : Schedule at   1352
camellia            [ 23]: Encrypt at   396, Decrypt at   391
whirlpool           : Process at    46
This commit is contained in:
Patrick Pelletier 2011-09-25 20:18:26 -07:00 committed by Steffen Jaeckel
parent cefff85550
commit ad566e1b00
1 changed files with 12 additions and 1 deletions
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13
src/headers/tomcrypt_macros.h
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@ -96,9 +96,20 @@ asm __volatile__ ( \
#endif
/* gcc 4.3 and up has a bswap builtin */
#if !defined(LTC_NO_BSWAP) && \
(defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 403))
#define STORE64H(x, y) \
{ ulong64 __t = __builtin_bswap64 ((x)); \
XMEMCPY ((y), &__t, 8); }
#define LOAD64H(x, y) \
{ XMEMCPY (&(x), (y), 8); \
(x) = __builtin_bswap64 ((x)); }
/* x86_64 processor */
#if !defined(LTC_NO_BSWAP) && (defined(__GNUC__) && defined(__x86_64__))
#elif !defined(LTC_NO_BSWAP) && (defined(__GNUC__) && defined(__x86_64__))
#define STORE64H(x, y) \
asm __volatile__ ( \