169515 2017-03-11 19:19:16 -0800 Air should be powerful enough to support Tmp-splitting 2017-03-14 18:10:43 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build All All NEW P2 Normal --- 1 fpizlo fpizlo oldest_to_newest 1286854 0 fpizlo 2017-03-11 19:19:16 -0800 I implemented a live range splitting phase that splits Tmps that are live only for cold uses. It's a performance regression, because it turns out that IRC isn't sufficiently graceful at coalescing to handle being overloaded with even more temporaries. The performance losses all came from programs that would get slightly worse register allocation when both the versions of the Tmp got spilled. Perhaps one day we could solve that with spill coalescing. But this patch didn't speed *anything* up, which casts a lot of doubt about the profitability of this approach. But in the process of writing the phase, I added some utilities to Air. I want to land those utilities. 1286855 1 304181 fpizlo 2017-03-11 19:26:09 -0800 Created attachment 304181 the patch I want to at least upload this useful code. 1287920 2 304181 saam 2017-03-14 18:10:43 -0700 Comment on attachment 304181 the patch View in context: https://bugs.webkit.org/attachment.cgi?id=304181&action=review r=me > Source/JavaScriptCore/b3/air/AirBreakCriticalEdges.h:34 > +void breakCriticalEdges(Code&); nice 304181 2017-03-11 19:26:09 -0800 2017-03-14 18:10:43 -0700 the patch blah.patch text/plain 25779 fpizlo SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMjEzNzY0KQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDM5IEBA CisyMDE3LTAzLTExICBGaWxpcCBQaXpsbyAgPGZwaXpsb0BhcHBsZS5jb20+CisKKyAgICAgICAg QWlyIHNob3VsZCBiZSBwb3dlcmZ1bCBlbm91Z2ggdG8gc3VwcG9ydCBUbXAtc3BsaXR0aW5nCisg 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