Hey all,
Within aes-x86_64.pl, I found this code:
mov OPENSSL_ia32cap_P(%rip),%r10d
cmp \$$speed_limit,%rdx
jb .Lcbc_slow_prologue
test \$15,%rdx
jnz .Lcbc_slow_prologue
bt \$28,%r10d
jc .Lcbc_slow_prologue
The last two lines make sure that x86_64_AES_encrypt_compact is used on
processors that support hyperthreading. I found that on my machine (a retina
macbook with an Intel i7-3720QM processor) this makes AES encryption much
slower (by about 35%).
Can anyone enlighten me on why openssl wants to use the "slow" version on
machines that support hyperthreading?
Thanks in advance,
Bert
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