121374 2013-09-14 18:21:00 -0700 Deoptimize deoptimization: make DFGOSRExitCompiler64.cpp more hackable 2013-09-27 11:38:35 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) All All RESOLVED FIXED P2 Normal --- 121064 122025 1 fpizlo fpizlo barraclough eflews.bot ggaren gyuyoung.kim mark.lam mhahnenberg msaboff oliver sam webkit-ews oldest_to_newest 929338 0 fpizlo 2013-09-14 18:21:00 -0700 It used to be the case that OSR exits happened a lot, and we sometimes let them happen roughly in proportion to the number of times that a function completed successfully. This was a long time ago - before we had good reoptimization heuristics and before we got our act together in other ways. Now we don't OSR exit that much. More than ~100 exits means that we reoptimize. Hence while we want OSR exit to not be terribly slow and it still makes sense to emit JIT code for it, we don't really care if it makes great use of registers or anything like that. But right now the OSRExitCompiler is still soooper optimized, and that makes the code hard to hack. This makes adding new kinds of data formats, which the exit compiler must know about, rather difficult. For example I couldn't figure out a good way of adding Int48 recoveries without either copy-pasting code or just adding a lot of confusing code paths. So, the best thing to do is probably to rewrite the exit compiler to be a lot dumber. The plan is to make it first dump all state into a scratch buffer (even if it's already in the stack in the right place!) and then dump back from the scratch buffer into the stack while performing the recoveries. This will allow for example combining the code for reboxing an int that was in the stack in the right place, in the stack in the wrong place, or in a register - all of those cases will work the same now, which is pretty awesome. 929339 1 211678 fpizlo 2013-09-14 18:21:36 -0700 Created attachment 211678 this is just the start 929344 2 211681 fpizlo 2013-09-14 21:01:58 -0700 Created attachment 211681 the patch 929345 3 211681 eflews.bot 2013-09-14 21:11:08 -0700 Comment on attachment 211681 the patch Attachment 211681 did not pass efl-wk2-ews (efl-wk2): Output: http://webkit-queues.appspot.com/results/1861597 929346 4 fpizlo 2013-09-14 21:14:15 -0700 (In reply to comment #3) > (From update of attachment 211681 [details]) > Attachment 211681 [details] did not pass efl-wk2-ews (efl-wk2): > Output: http://webkit-queues.appspot.com/results/1861597 That's easy to fix. Just remove the variable. 929348 5 211681 eflews.bot 2013-09-14 21:24:07 -0700 Comment on attachment 211681 the patch Attachment 211681 did not pass efl-ews (efl): Output: http://webkit-queues.appspot.com/results/1817575 929353 6 211681 ggaren 2013-09-14 21:51:25 -0700 Comment on attachment 211681 the patch r=me 929396 7 211681 webkit-ews 2013-09-15 02:16:48 -0700 Comment on attachment 211681 the patch Attachment 211681 did not pass qt-ews (qt): Output: http://webkit-queues.appspot.com/results/1878611 929397 8 211681 webkit-ews 2013-09-15 02:18:42 -0700 Comment on attachment 211681 the patch Attachment 211681 did not pass qt-wk2-ews (qt-wk2): Output: http://webkit-queues.appspot.com/results/1817643 929458 9 211715 fpizlo 2013-09-15 11:02:23 -0700 Created attachment 211715 patch for landing Just checking if I fixed the build. 929478 10 fpizlo 2013-09-15 11:54:39 -0700 Landed in http://trac.webkit.org/changeset/155820 211678 2013-09-14 18:21:36 -0700 2013-09-14 21:01:58 -0700 this is 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