Mineeva, Tatyana A
2017-03-29 15:54:22 UTC
I'm working with the Intel team to add AVX-512 support to Valgrind.
Our team cannot access the Valgrind Subversion repository:
$ svn co svn://svn.valgrind.org/valgrind/trunk valgrind
svn: Can't connect to host 'svn.valgrind.org': Connection timed out
Is the this repository functional, or should we switch to the git repository?
We do not currently have success cloning the Valgrind git repository:
$ git clone git://sourceware.org/git/valgrind.git
Cloning into 'valgrind'...
fatal: unable to connect to sourceware.org:
sourceware.org[0: 220.127.116.11]: errno=Connection timed out
Might you or another developer have an idea of configuration settings we should use on our end?
I would also like to take this opportunity to update you on our current progress on adding AVX-512 support to Valgrind. We will appreciate any comments and questions.
We started with the base Valgrind 3.12.0 which we downloaded from the website.
- Extended Valgrind's HW capabilities detection to detect AVX-512 support and tell VEX about it.
- Extended the implementation of XSAVE and XRSTOR to cover the new registers. We tested it under Nulgrind on the tests from ./memcheck/tests/amd64/xsave-avx.c, which we extended to cover the new register state. We haven't yet tested it on a real context switch or runtime library call.
- Added support of a few AVX-512 instructions (vmovups, vmovdqa32, vmovdqa64, vpsubd) to Valgrind core. The instructions double up the IR of their AVX-2 version.
- For the tests, we are using a slightly modified version of none/tests/amd64/avx2-1.c. Basically, it replaces ymm registers with zmm registers; it does not verify the new features of AVX-512 instructions (such as opmasks) yet. The newly added instructions pass the tests under Nulgrind.
- We are currently adding support of the new registers to memcheck.
We plan to try implementing some AVX-512 instructions without doubling up the existing IR next.
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