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rijndael-aesni: small optimization for cbc-enc and cfb-enc

Description

rijndael-aesni: small optimization for cbc-enc and cfb-enc

* cipher/rijndael-aesni.c (_gcry_aes_aesni_cfb_enc)
(_gcry_aes_aesni_cbc_enc): Copy contents of 'do_aesni_enc' here and
merge input/output and first/last round key xoring to shorten critical
path.

Benchmark on AMD Ryzen 7 5800X:

Before:
AES | nanosecs/byte mebibytes/sec cycles/byte auto Mhz

CBC enc |     0.541 ns/B      1762 MiB/s      2.62 c/B      4850
CFB enc |     0.541 ns/B      1762 MiB/s      2.63 c/B      4850

After (5% faster):
AES | nanosecs/byte mebibytes/sec cycles/byte auto Mhz

CBC enc |     0.515 ns/B      1850 MiB/s      2.50 c/B      4850
CFB enc |     0.515 ns/B      1851 MiB/s      2.50 c/B      4850
  • Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>

Details

Provenance
jukiviliAuthored on Tue, Jan 11, 6:52 PM
Parents
rC0c0f27a89205: mpi/amd64: remove extra 'ret' from assembly functions
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