Vladimir Makarov wrote:
So, now my questions: How much do you think could this could improve
compiled code speed? Would the current GCC/YARA benefit from such an
optimization pass at all?
I think nobody can answer the questions until it is implemented.
Agreed.
If you are going to work on this project, some small advice about
evaluating register sufficiency. I found that register pressure is
already practically minimized before insn-scheduling (I suspect that
it is mostly done in TER).
I was rather surprised to stumble upon this myself -- I find myself
regularly looking functions where we spilled and couldn't see any way to
avoid spilling without some kind of range splitting objects in
non-obvious ways.
The one case I did see where we regularly spilled that could be avoided
was excessively long ranges created by loading incoming arguments into
pseudos. I haven't bothered to look into ways to improve that situation.
Jeff
