Bug 112840

Summary:	Use LLVM as a backend for the fourth-tier DFG JIT (a.k.a. the FTL JIT)
Product:	WebKit	Reporter:	Filip Pizlo <fpizlo>
Component:	JavaScriptCore	Assignee:	Filip Pizlo <fpizlo>
Status:	RESOLVED FIXED
Severity:	Normal	CC:	alexgartrell+webkit, alonzakai, barraclough, catfish.man, ggaren, mark.lam, mhahnenberg, msaboff, nick.diego, nrotem, oliver, sam, syoichi, zherczeg
Priority:	P2	Keywords:	InRadar
Version:	528+ (Nightly build)
Hardware:	All
OS:	All
Bug Depends on:	113437, 113452, 113481, 113619, 113621, 113622, 113623, 113624, 113625, 113634, 113635, 113646, 113656, 113668, 113675, 113679, 113728, 113740, 113757, 113759, 113914, 113915, 113921, 113986, 114551, 114925, 114926, 114930, 114933, 115920, 115923, 115924, 115926, 115927, 115939, 115941, 115942, 115998, 116189, 116631, 116739, 116741, 116771, 116792, 116884, 116885, 116890, 116892, 117704, 117849, 117852, 118075, 118077, 118091, 118095, 118097, 118141, 118148, 118276, 118277, 118311, 118313, 118329, 118335, 118338, 118647, 118749, 118857, 118947, 120184, 120194, 120221, 120696, 120890, 120900, 120905, 120916, 120921, 120965, 120972, 120987, 122193, 122318, 122566, 122905, 123062, 123232, 123302, 123535, 123591, 123605, 123637, 123638, 123681, 123682, 123783, 123784, 123817, 123824, 123849, 123854, 123855, 123862, 123865, 124010, 124067, 124086, 124092, 124093, 124094, 124100, 124138, 124479, 124733, 124960, 125275, 125283, 125360, 125368, 125370, 125426, 125430, 125433, 125747, 125755, 126543, 126545, 126587, 126620, 126652, 126679, 126722, 126797, 126798, 126799, 126804, 126822, 126961, 127144, 127163, 127215, 127244, 127325, 127383, 127384, 127459, 127460, 127462, 127463, 127645, 127698, 127709, 127746, 127789, 127790, 127791, 127848, 127933, 128010, 128015, 128030, 128039, 128045, 128217, 128269, 128278, 128330, 128521, 128571, 128638, 128648, 128756, 128795, 128850, 128890, 128892, 128918, 128921, 128922, 128923, 128948, 128984, 129010, 129018, 129020, 129023, 129054, 129055, 129066, 129085, 129125, 129129, 129159, 129210, 129212, 129334, 129495, 129503, 129563, 129747, 129755, 129756, 129785, 129806, 129810, 129998, 130001, 130041, 130116, 130154, 130156, 130202, 130265, 130281, 130285, 130296, 130300, 130440, 130535, 130546, 130562, 130791, 130867, 131385
Bug Blocks:	132356, 112836

Filip Pizlo

Reported 2013-03-20 13:45:14 PDT

The DFG currently does a lot of great high-level optimizations, but still keeps it pretty simple when it comes to low-level ones. One option for fixing this would be to write a great backend from scratch. That would be super fun. But before we do that, it would be cool to do a sort of limit study to explore how much LLVM would give us.

Attachments
Add attachment proposed patch, testcase, etc.

Filip Pizlo

Comment 1 2013-03-21 00:50:59 PDT

<rdar://problem/13468946>

Zoltan Herczeg

Comment 2 2013-04-03 05:00:09 PDT

Just a joke: FTL in BSG means Faster Than Light, lets aim that speed ;)

Filip Pizlo

Comment 3 2014-04-29 15:02:46 PDT

Landed in http://trac.webkit.org/changeset/167958

Filip Pizlo

Comment 4 2014-07-02 15:31:56 PDT

*** Bug 120047 has been marked as a duplicate of this bug. ***

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