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authorLinus Torvalds <torvalds@linux-foundation.org>2009-08-06 07:27:57 -0700
committerJunio C Hamano <gitster@pobox.com>2009-08-06 13:56:45 -0700
commite869e113c8f91999f9a433436e0b863fe2727b61 (patch)
tree06462d71c0f8dbbf735da04994967cc0e92f9da2
parentab14c823dfbf1245712c8179952b51822135d8a8 (diff)
downloadgit-e869e113c8f91999f9a433436e0b863fe2727b61.tar.gz
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.c2
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)