[llvm-dev] xtensa backend

[Maxime BOURREAU via llvm-dev]

Can you give me some insights to implement the windowed calling convention
in this xtensa backend :
https://github.com/afonso360/llvm-xtensa/tree/xtensa/lib/Target/Xtensa ?

For now, only the simpler CALL0 calling convention is implemented.

In order to implement the windowed calling convention, every routines must
start with the ENTRY instruction which increments the register window
pointer.

Do I have to manually insert this instruction during the PrologEpilog
phase, and how can I declare this instruction ?

Maxime
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20180419/6af105e9/attachment.html>