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Date: Sat, 15 Aug 2015 16:57:22 +0300
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: testing without SIMD, and different SIMD
Kai -
You'll need to re-do all of your tests without SIMD, as well as continue
running them in default, SIMD-enabled builds, and in different
SIMD-enabled builds. This exposes different code paths, and we need to
have all code paths tested for possible bugs. I think you'll find more
bugs that way.
On x86_64, this achieves a different SIMD-enabled build:
./configure --disable-native-tests
Target CPU ................................. x86_64 SSE2, 64-bit LE
SSE2 instead of AVX. Probably won't expose more bugs, but worth trying.
This achieves a build using MMX... and since it's so obscure on x86_64,
I guess it might not even build, but is worth trying:
./configure --disable-native-tests CFLAGS='-O2 -mno-sse2'
Target CPU ................................. x86_64 MMX, 64-bit LE
This achieves a SIMD-less build, which should in fact build and will
likely expose plenty of bugs that you haven't found so far:
./configure --disable-native-tests CFLAGS='-O2 -mno-sse2 -mno-mmx'
Target CPU ................................. x86_64, 64-bit LE
This should produce a 32-bit yet fully SIMD-enabled build, and it should
in fact build and expose more bugs too:
setarch i686
./configure
Target CPU ................................. i686 AVX, 64-bit LE
This disables AVX:
setarch i686
./configure --disable-native-tests
Target CPU ................................. i686 SSE2, 64-bit LE
This further disables SSE*, but leaves MMX (so 64-bit instead of
128-bit vectors). Should build and expose more bugs:
setarch i686
./configure --disable-native-tests CFLAGS='-O2 -mno-sse2'
Target CPU ................................. i686 MMX, 64-bit LE
This produces a 32-bit SIMD-less build. Should build and expose more bugs:
setarch i686
./configure --disable-native-tests CFLAGS='-O2 -mno-sse2 -mno-mmx'
Target CPU ................................. i686, 64-bit LE
In fact, I see a fatal issue right away: it says 64-bit on all of these
i686 targets, but they are 32-bit.
Scrolling up, I see:
checking build system type... i686-pc-linux-gnu
checking host system type... i686-pc-linux-gnu
[...]
checking size of short... 2
checking size of int... 4
checking size of long... 8
checking size of long long... 8
checking size of int *... 8
checking size of void *... 8
configure: Testing tool-chain's CPU features
checking for MMX... no
checking for arch.h alternative... x86-any.h
checking for 32/64 bit... 64-bit
checking for extra ASFLAGS... None needed
checking for X32 ABI... no
checking for byte ordering according to target triple... little
Weird stuff. Maybe we need to add -m32 to CFLAGS. Then I get:
-sh-4.1$ ./configure --disable-native-tests CFLAGS='-O2 -m32 -mno-sse2 -mno-mmx'
checking build system type... i686-pc-linux-gnu
checking host system type... i686-pc-linux-gnu
[...]
checking size of short... 2
checking size of int... 4
checking size of long... 4
checking size of long long... 8
checking size of int *... 4
checking size of void *... 4
configure: Testing tool-chain's CPU features
checking for MMX... no
checking for arch.h alternative... x86-any.h
checking for 32/64 bit... 32-bit
checking for extra ASFLAGS... None needed
checking for X32 ABI... no
but it fails at:
checking for openssl/opensslv.h... yes
checking for SSL_library_init in -lssl... no
Looks like I need to install 32-bit OpenSSL development package, and
then we'll need to include -m32 on those last 4 ./configure's I
suggested, in addition to "setarch i686".
Alexander
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