diff options
| -rw-r--r-- | crypto/aes/asm/aes-s390x.pl | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/crypto/aes/asm/aes-s390x.pl b/crypto/aes/asm/aes-s390x.pl index 6ee2097a15..4b27afd92f 100644 --- a/crypto/aes/asm/aes-s390x.pl +++ b/crypto/aes/asm/aes-s390x.pl @@ -35,11 +35,11 @@ # # Add support for hardware AES192/256 and reschedule instructions to # minimize/avoid Address Generation Interlock hazard and to favour -# dual-issue z10 pipeline. This gave ~25% improvement on z10. The gain -# should be larger on earlier CPUs, because being dual-issue z10 makes -# it improssible to eliminate the interlock condition, critial path is -# not long enough. Yet z10 spends ~24 cycles per byte processed with -# 128-bit key. +# dual-issue z10 pipeline. This gave ~25% improvement on z10 and +# almost 50% on z9. The gain is smaller on z10, because being dual- +# issue z10 makes it improssible to eliminate the interlock condition: +# critial path is not long enough. Yet it spends ~24 cycles per byte +# processed with 128-bit key. # # Unlike previous version hardware support detection takes place only # at the moment of key schedule setup, which is denoted in key->rounds. |