llvm dev - Feb 2020 - RISC-V LLVM sync-up call 20th Feb 2020

For background on these calls, see
<http://lists.llvm.org/pipermail/llvm-dev/2019-September/135087.html>.

Reminder: the purpose is to co-ordinate between active contributors.
If you have support questions etc then it's best to post to llvm-dev.

We have a call each Thursday at 4pm GMT, via
<https://meet.google.com/ske-zcog-spp>.

I've created a shared calendar which may help in keeping track, which
is accessible at:
  *
<https://calendar.google.com/calendar/b/1?cid=bG93cmlzYy5vcmdfMG41cGtlc2ZqY25wMGJoNWhwczFwMGJkODBAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ>
  *
<https://calendar.google.com/calendar/ical/lowrisc.org_0n5pkesfjcnp0bh5hps1p0bd80%40group.calendar.google.com/public/basic.ics>

Issues to discuss today include the following:
* 10.0 status
  * Atomic cmp xchg fix <https://reviews.llvm.org/D74453>
  * checkatomic fix <https://reviews.llvm.org/D68964>
  * CallPreservedMask fix <https://reviews.llvm.org/D74596>
* Simon's AssemblerPredicate RFC https://reviews.llvm.org/D74338 and
http://lists.llvm.org/pipermail/llvm-dev/2020-February/139138.html
* Experimental/unratified extensions patch
<https://reviews.llvm.org/D73891> (blocked on patch above, and
bitmanip patch)
* Embedded PIC update
<https://github.com/riscv/riscv-elf-psabi-doc/issues/128>
* ELF attribute patch status <https://reviews.llvm.org/D74023>
* Work from Luis on test failures on rv64 host
* FYI: suboptimal codegen from add/mul combines reported
<https://reviews.llvm.org/D74725>
* No other topics were submitted, as always, please do submit things
you'd like to discuss

Best,

Alex