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| author | Andy Polyakov <appro@openssl.org> | 2013-04-04 15:54:08 +0200 |
|---|---|---|
| committer | Andy Polyakov <appro@openssl.org> | 2013-04-04 15:54:08 +0200 |
| commit | 7f97d57236c8407a163a4e9f43a65c0dd691a057 (patch) | |
| tree | 4721077be1767a4dd699d3a8f02643e37dd1f083 | |
| parent | c9a8e3d1c754cee8551d36cd54a1ea675ee8d055 (diff) | |
| download | openssl-7f97d57236c8407a163a4e9f43a65c0dd691a057.zip openssl-7f97d57236c8407a163a4e9f43a65c0dd691a057.tar.gz openssl-7f97d57236c8407a163a4e9f43a65c0dd691a057.tar.bz2 | |
dest4-sparcv9.pl: add clarification comment.
| -rw-r--r-- | crypto/des/asm/dest4-sparcv9.pl | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/crypto/des/asm/dest4-sparcv9.pl b/crypto/des/asm/dest4-sparcv9.pl index 5936a65..f9d9711 100644 --- a/crypto/des/asm/dest4-sparcv9.pl +++ b/crypto/des/asm/dest4-sparcv9.pl @@ -282,7 +282,15 @@ des_t4_cbc_decrypt: st %f3, [$ivec + 4] .type des_t4_cbc_decrypt,#function .size des_t4_cbc_decrypt,.-des_t4_cbc_decrypt +___ + +# One might wonder why does one have back-to-back des_iip/des_ip +# pairs between EDE passes. Indeed, aren't they inverse of each other? +# They almost are. Outcome of the pair is 32-bit words being swapped +# in target register. Consider pair of des_iip/des_ip as a way to +# perform the due swap, it's actually fastest way in this case. +$code.=<<___; .globl des_t4_ede3_cbc_encrypt .align 32 des_t4_ede3_cbc_encrypt: |