On 14/06/2017 14:35, Alex Bennée wrote: >> That would cause an unnecessary slowdown in code that runs with >> interrupts disabled but does a lot of indirect jumps... ppc's SLOF >> firmware probably qualifies. > > Really?
Yes. :) SLOF basically runs a Forth interpreter. If you run "qemu-system-ppc64 -d in_asm", you'll see a lot of "bctr" and "bctrl" instruction (respectively ARM's "br" and "blr" IIRC). > I'd have to measure the change it makes. Is there a benchmark > stanza for measuring the PPC slof firmware time? Just booting. PPC doesn't have tcg_gen_lookup_and_goto_ptr support yet, so it would be a theoretical slowdown at this time. Paolo > I have 3 patches now which all fix the same thing so we can pick and > choose which we should apply. Patches incoming...
