On 3/25/2021 8:21 AM, Stefan Franke wrote:
Hi there,
I consider implementing movmemsi/setmemsi for some arch using post_inc. Is
there a "best practice" for using auto increments in such early stages to
avoid hickups in cse, gcse, cprop etc.p.p.?
IIRC best practice is not to expose auto-inc until the auto-inc pass as
earlier passes don't know how to deal with them. See "Incdec" in the
developer manual.
I'm also not aware of a target where an autoinc happens in contexts
other than in a MEM. So you may run into problems with things that look
like a simple reg->reg move -- insns 8 and 9 in your example.
jeff
