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| author | Arvind Sankar <nivedita@alum.mit.edu> | 2020-10-25 10:31:19 -0400 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2020-10-30 17:35:04 +1100 |
| commit | 18d05ca4486fe38991c3166b1f4df26b8a029665 (patch) | |
| tree | 5177e8c734e1f2b4379c23f4f5860dbde4be3f7f /lib | |
| parent | 63642d5c141f1bcbe97f7895467a724ad2e3f346 (diff) | |
| download | linux-stable-18d05ca4486fe38991c3166b1f4df26b8a029665.tar.gz linux-stable-18d05ca4486fe38991c3166b1f4df26b8a029665.tar.bz2 linux-stable-18d05ca4486fe38991c3166b1f4df26b8a029665.zip | |
crypto: lib/sha256 - Unroll LOAD and BLEND loops
Unrolling the LOAD and BLEND loops improves performance by ~8% on x86_64
(tested on Broadwell Xeon) while not increasing code size too much.
Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Reviewed-by: Eric Biggers <ebiggers@google.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/crypto/sha256.c | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/lib/crypto/sha256.c b/lib/crypto/sha256.c index e2e29d9b0ccd..cdef37c05972 100644 --- a/lib/crypto/sha256.c +++ b/lib/crypto/sha256.c @@ -76,12 +76,28 @@ static void sha256_transform(u32 *state, const u8 *input, u32 *W) int i; /* load the input */ - for (i = 0; i < 16; i++) - LOAD_OP(i, W, input); + for (i = 0; i < 16; i += 8) { + LOAD_OP(i + 0, W, input); + LOAD_OP(i + 1, W, input); + LOAD_OP(i + 2, W, input); + LOAD_OP(i + 3, W, input); + LOAD_OP(i + 4, W, input); + LOAD_OP(i + 5, W, input); + LOAD_OP(i + 6, W, input); + LOAD_OP(i + 7, W, input); + } /* now blend */ - for (i = 16; i < 64; i++) - BLEND_OP(i, W); + for (i = 16; i < 64; i += 8) { + BLEND_OP(i + 0, W); + BLEND_OP(i + 1, W); + BLEND_OP(i + 2, W); + BLEND_OP(i + 3, W); + BLEND_OP(i + 4, W); + BLEND_OP(i + 5, W); + BLEND_OP(i + 6, W); + BLEND_OP(i + 7, W); + } /* load the state into our registers */ a = state[0]; b = state[1]; c = state[2]; d = state[3]; |