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| author |  Linus Torvalds <torvalds@linux-foundation.org> | 2009-08-06 07:27:57 -0700 |
|---|---|---|
| committer |  Junio C Hamano <gitster@pobox.com> | 2009-08-06 13:56:45 -0700 |
| commit | e869e113c8f91999f9a433436e0b863fe2727b61 (patch) | |
| tree | 06462d71c0f8dbbf735da04994967cc0e92f9da2 | |
| parent | block-sha1: macroize the rounds a bit further (diff) | |
| download | tgif-e869e113c8f91999f9a433436e0b863fe2727b61.tar.xz | |
block-sha1: Use '(B&C)+(D&(B^C))' instead of '(B&C)|(D&(B|C))' in round 3
It's an equivalent expression, but the '+' gives us some freedom in
instruction selection (for example, we can use 'lea' rather than 'add'),
and associates with the other additions around it to give some minor
scheduling freedom.
Suggested-by: linux@horizon.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
| -rw-r--r-- | block-sha1/sha1.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/block-sha1/sha1.c b/block-sha1/sha1.c index 53c93ba603..5bf1b36bd1 100644 --- a/block-sha1/sha1.c +++ b/block-sha1/sha1.c @@ -112,7 +112,7 @@ void blk_SHA1_Final(unsigned char hashout[20], blk_SHA_CTX *ctx) #define T_0_15(t) SHA_ROUND(t, SHA_SRC, (((C^D)&B)^D) , 0x5a827999 ) #define T_16_19(t) SHA_ROUND(t, SHA_MIX, (((C^D)&B)^D) , 0x5a827999 ) #define T_20_39(t) SHA_ROUND(t, SHA_MIX, (B^C^D) , 0x6ed9eba1 ) -#define T_40_59(t) SHA_ROUND(t, SHA_MIX, ((B&C)|(D&(B|C))) , 0x8f1bbcdc ) +#define T_40_59(t) SHA_ROUND(t, SHA_MIX, ((B&C)+(D&(B^C))) , 0x8f1bbcdc ) #define T_60_79(t) SHA_ROUND(t, SHA_MIX, (B^C^D) , 0xca62c1d6 ) static void blk_SHA1Block(blk_SHA_CTX *ctx, const unsigned int *data) |