john-dev - cryptmd5.cu fails to build with -arch sm

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Date: Wed, 11 Apr 2012 07:49:40 +0400
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: cryptmd5.cu fails to build with -arch sm_13

Lukas, magnum -

The current magnum-jumbo fails to build with the CUDA target on
cryptmd5.cu as follows:

cd cuda; nvcc -c -Xptxas -v -arch sm_13 cryptmd5.cu
ptxas info    : Compiling entry function '_Z14kernel_crypt_rP18crypt_md5_passwordPj' for 'sm_13'
ptxas info    : Used 38 registers, 64+0 bytes lmem, 30736+16 bytes smem, 21 bytes cmem[0], 48 bytes cmem[1]
ptxas error   : Entry function '_Z14kernel_crypt_rP18crypt_md5_passwordPj' uses too much shared data (0x7810 bytes + 0x10 bytes system, 0x4000 max)
make[1]: *** [cuda_cryptmd5.o] Error 255

Changing sm_13 to sm_20 makes it build.

I am not sure what fix is best (reduce the required data size, use sm_20
by default, something else), but we must have the entire tree build fine
with its default settings.  Also, even if we use sm_20 by default, it
should be fairly easy for someone with an older card to use sm_13 or
lower instead.  And I recall that sm_13 provided better speed for some
of the formats on some cards, although I guess this may/will change.

So please fix this such that the tree builds with no tweaks necessary.

Thanks,

Alexander

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