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crypto: x86/sha256-ni - simplify do_4rounds

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Instead of loading the message words into both MSG and \m0 and then
adding the round constants to MSG, load the message words into \m0 and
the round constants into MSG and then add \m0 to MSG.  This shortens the
source code slightly.  It changes the instructions slightly, but it
doesn't affect binary code size and doesn't seem to affect performance.

Suggested-by: Stefan Kanthak <stefan.kanthak@nexgo.de>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2024-04-11 09:23:59 -07:00 committed by Herbert Xu
parent 59e62b20ac
commit 7daba20cc7
1 changed files with 4 additions and 6 deletions
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10
arch/x86/crypto/sha256_ni_asm.S
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@ -78,13 +78,11 @@
.macro do_4rounds i, m0, m1, m2, m3
.if \i < 16
movdqu \i*4(DATA_PTR), MSG
pshufb SHUF_MASK, MSG
movdqa MSG, \m0
.else
movdqa \m0, MSG
movdqu \i*4(DATA_PTR), \m0
pshufb SHUF_MASK, \m0
.endif
paddd (\i-32)*4(SHA256CONSTANTS), MSG
movdqa (\i-32)*4(SHA256CONSTANTS), MSG
paddd \m0, MSG
sha256rnds2 STATE0, STATE1
.if \i >= 12 && \i < 60
movdqa \m0, TMP