Re: [PATCH] x86/ioapic: Improve code generation for __io_apic_{read,write}()

On 05.08.2020 15:54, Andrew Cooper wrote: > The write into REGSEL prevents the optimiser from reusing the address > calculation, forcing it to be calcualted twice. > > The calculation itself is quite expensive. Pull it out into a local varaible. > > Bloat-o-meter reports: > add/remove: 0/0 gro

[PATCH] x86/ioapic: Improve code generation for __io_apic_{read, write}()

The write into REGSEL prevents the optimiser from reusing the address calculation, forcing it to be calcualted twice. The calculation itself is quite expensive. Pull it out into a local varaible. Bloat-o-meter reports: add/remove: 0/0 grow/shrink: 0/26 up/down: 0/-1527 (-1527) Also correct th