hkaiser changed the topic of #ste||ar to: STE||AR: Systems Technology, Emergent Parallelism, and Algorithm Research | stellar-group.org | HPX: A cure for performance impaired parallel applications | github.com/STEllAR-GROUP/hpx | This channel is logged: irclog.cct.lsu.edu
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<zao> gnikunj[m]: I ran into some fun vectorized code when reverse engineering a game recently. Ghidra showed a single SIMD branch as copy-pasted operations on 16 bytes in a row. Was something like `if (s[N] == '\\') s[N] = '/'`. Very eye catching with a whole page of code for cases of 16, 8, and then a fixup loop for the rest.
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<hkaiser> zao: do you still have your freebsd virtual machine available?
<zao> I don't think I have any configured currently, having some fun problems?
<zao> Let's see if the VM gods smile upon us, having some trouble finding a working mirror.
<hkaiser> zao: I have a possible fix, but can't verify it locally...
<zao> I'll see if I can get a repro build up on the machine.
<zao> Failure reproduced with 13.2 and clang 14.
<zao> hkaiser: With the fix PR, a stock build completes (cmake -B /stellar/builds/hpx.fix -S /stellar/repos/hpx.fix -G Ninja -DCMAKE_INSTALL_PREFIX=/stellar/inst/hpx.fix)
<zao> It builds the examples at least, tests take an eternity to build but seems to get through the first bunch at least.
<zao> The examples seem to be a bit noisy when running them, not sure if that's new: https://gist.github.com/zao/d46164039a9a5043e6b7a8ae08ab0d9d
<hkaiser> zao: thanks - I have no idea where that output is coming from
<hkaiser> but the problem at hand seems to be solved - good
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