https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100266
Bug ID: 100266
Summary: [RISCV] Provide programmatic implementation of CAS
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: christophm30 at gmail dot com
Target Milestone: ---
At the moment CAS is implemented in form of a hard-coded sequence in sync.md.
When implementing this in a programmatic way (i.e. in riscv.c) we can make this
code much more maintainable. Moving this into C-code also allows to properly
emit the proper fences for ensuring the required memory ordering.
To do so we need to basically do the following:
* model LR and SC INSNs
* implement riscv_expand_compare_and_swap () in riscv.c
