RFA: patch for register pressure sensitive insn scheduling

[Andi Kleen]

Paolo Bonzini <bonzini@gnu.org> writes:

>> Somebody could ask me why register pressure sensitive insn
>> scheduling is not default.
>
> What about making it the default only when loop unrolling is on?  What
> is the performance improvement for "-O2 -funroll-loops" vs. "-O2
> -funroll-loops -fschedule-insns"?

It sounds like it should be default for -O3 at least.

-Andi