openssl: anyone building with assembly optimizations enable?

[David Baggett]

I've got openssl 1.0.2 trunk building for all the NaCl arches with these Configure targets:

"nacl-x86_64-clang-newlib", "cc:-O3 -fomit-frame-pointer -Wall::-DL_ENDIAN -D_REENTRANT -DTERMIOS -DNO_SYSLOG:::SIXTY_FOUR_BIT RC4_CHUNK DES_INT DES_UNROLL:::::::",

"nacl-i386-clang-newlib","cc:-O3 -fomit-frame-pointer -Wall::-DL_ENDIAN -D_REENTRANT -DTERMIOS -DNO_SYSLOG:::BN_LLONG:::",

"nacl-arm-clang-newlib","cc:-O3 -fomit-frame-pointer -Wall::-DL_ENDIAN -D_REENTRANT -DTERMIOS -DNO_SYSLOG:::BN_LLONG::",

"pnacl-le32","gcc:-O3 -fomit-frame-pointer -Wall::-DL_ENDIAN -D_REENTRANT -DNO_SYSLOG -DGETPID_IS_MEANINGLESS -UHAVE_CRYPTODEV::-lnacl_io -lppapi -lc++:BN_LLONG RC4_CHAR RC4_CHUNK DES_INT DES_UNROLL BF_PTR:${no_asm}:::::",

Has anyone had any luck enable x86 or arm assembly optimizations? They would approximately double performance if we could get them working.

Dave

[Ben Smith]

NaCl assembly must be sandboxed, so it won't work without porting. If you want to give it a try, the sandbox internals page is a good reference.

[David Baggett]

RIght, I ported a little of assembly for i686/x32/arm already so I know (vaguely) what's involved.

I assume AES-NI and ARM AES instructions are unlikely to ever be supported?

Dave

[Petr Hosek]

If you don't want to do the sandboxing by hand, you can try the experimental auto-sandboxing support. The linked design document has information about the implementation. To enable auto-sandboxing, you need to pass the following flags to nacl-clang (e.g. by appending them to CFLAGS): ' -integrated-as -mllvm -nacl-enable-auto-sandboxing'

If you run into errors, please let us know, we're still debugging the auto-sandboxing implementation (which is why it's not enabled by default yet) and we're looking for more feedback.

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[David Baggett]

Sweet -- thanks, Petr! I did not know about auto-sandboxing and will give it a try.

Dave

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[David Baggett]

Right off the bat I get:

vpaes-x86_64.s:49:2: error: Not enough scratch registers specified
        movdqa  -64(%r11,%r10,1),%xmm1
        ^

I'll investigate further.

Dave

On Tuesday, February 2, 2016 at 5:35:30 PM UTC-5, Petr Hosek wrote:

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[David Baggett]

OK, I see that I have to provide .scratch directives to help the sandboxing code.
Dave