RISC-V LLVM sync-up call 11th June 2020

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

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 every alternate Thursday at 4pm BST, via
<https://meet.google.com/ske-zcog-spp&gt;\.

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&gt;
  * <https://calendar.google.com/calendar/ical/lowrisc.org_0n5pkesfjcnp0bh5hps1p0bd80%40group.calendar.google.com/public/basic.ics&gt;

Issues to discuss today include the following:

* Improving compiler-rt testing of atomics ⚙ D81348 [compiler-rt][builtins] Add tests for atomic builtins support functions
* Anyone looking to implement -mpreferred-stack-boundary for RISC-V?
(question from Ana)
* Note recent psABI clarifications (Thanks Evandro!)
Augment the relocations table by ebahapo · Pull Request #148 · riscv-non-isa/riscv-elf-psabi-doc · GitHub
Augument the information for DWARF relocations by ebahapo · Pull Request #151 · riscv-non-isa/riscv-elf-psabi-doc · GitHub
* Ping on -ffine-grained-bitfiled-access improvement patch
⚙ D79155 [CodeGen] Increase applicability of ffine-grained-bitfield-accesses for targets with limited native integer widths
* libunwind on RV32 ⚙ D80690 [RISCV] Support libunwind for riscv32
* strictfp/ftrapping-math patch ⚙ D81391 [RISC-V] Do not crash when using -ftrapping-math
* Bitmanip status
* Vector status
* Reminder: we now meet every other week. We'll meet again on Thu 25th June.
* No other topics were submitted, as always, please do submit things
you'd like to discuss

Best,

Alex