196578 2019-04-03 16:44:30 -0700 B3 peephole optimizations should live in their own file, and be used by FTLOutput.cpp 2019-04-24 17:24:25 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified NEW P2 Normal --- 1 rmorisset rmorisset ews-watchlist fpizlo keith_miller mark.lam msaboff saam oldest_to_newest 1524044 0 rmorisset 2019-04-03 16:44:30 -0700 Currently, the peephole optimizations are part of B3ReduceStrength. I plan to make it possible to run them on the fly as we create new values and put them in their own file (form which they will be publicly visible) so that FTLOutput.h can call them directly. This should help feed B3 some leaner/faster to compile code. In the long term, this refactoring should also help create an abstract interpreter that also calls these peephole optimizations, feeding them extra information. 1524333 1 366733 rmorisset 2019-04-04 11:36:12 -0700 Created attachment 366733 Patch Most of this big patch is a fairly mechanical refactoring, taking the peephole optimizations out of B3ReduceStrength. I also then used these peephole optimizations in FTLOutput and a bit in B3LowerMacros, to provide motivation for the refactoring. 1524334 2 ews-watchlist 2019-04-04 11:42:13 -0700 Attachment 366733 did not pass style-queue: ERROR: Source/JavaScriptCore/b3/B3PeepholeOptimizer.cpp:203: An else if statement should be written as an if statement when the prior "if" concludes with a return, break, continue or goto statement. [readability/control_flow] [4] ERROR: Source/JavaScriptCore/b3/B3PeepholeOptimizer.cpp:291: An else if statement should be written as an if statement when the prior "if" concludes with a return, break, continue or goto statement. [readability/control_flow] [4] ERROR: Source/JavaScriptCore/b3/B3PeepholeOptimizer.cpp:352: An else if statement should be written as an if statement when the prior "if" concludes with a return, break, continue or goto statement. [readability/control_flow] [4] ERROR: Source/JavaScriptCore/b3/B3PeepholeOptimizer.cpp:358: Missing space before { [whitespace/braces] [5] ERROR: Source/JavaScriptCore/b3/B3PeepholeOptimizer.cpp:380: An else if statement should be written as an if statement when the prior "if" concludes with a return, break, continue or goto statement. [readability/control_flow] [4] ERROR: Source/JavaScriptCore/b3/B3PeepholeOptimizer.cpp:499: A case label should not be indented, but line up with its switch statement. [whitespace/indent] [4] ERROR: Source/JavaScriptCore/b3/B3PeepholeOptimizer.cpp:693: An else if statement should be written as an if statement when the prior "if" concludes with a return, break, continue or goto statement. [readability/control_flow] [4] ERROR: Source/JavaScriptCore/b3/B3PeepholeOptimizer.cpp:976: A case label should not be indented, but line up with its switch statement. [whitespace/indent] [4] ERROR: Source/JavaScriptCore/b3/B3PeepholeOptimizer.cpp:1100: Missing space before ( in switch( [whitespace/parens] [5] ERROR: Source/JavaScriptCore/b3/B3PeepholeOptimizer.cpp:1279: Missing space before ( in switch( [whitespace/parens] [5] ERROR: Source/JavaScriptCore/b3/B3PeepholeOptimizer.cpp:1562: Tests for true/false, null/non-null, and zero/non-zero should all be done without equality comparisons. [readability/comparison_to_zero] [5] ERROR: Source/JavaScriptCore/b3/B3PeepholeOptimizer.cpp:1562: An else if statement should be written as an if statement when the prior "if" concludes with a return, break, continue or goto statement. [readability/control_flow] [4] ERROR: Source/JavaScriptCore/b3/B3PeepholeOptimizer.h:75: The parameter name "origin" adds no information, so it should be removed. [readability/parameter_name] [5] ERROR: Source/JavaScriptCore/b3/B3PeepholeOptimizer.h:107: The parameter name "offset" adds no information, so it should be removed. [readability/parameter_name] [5] ERROR: Source/JavaScriptCore/b3/B3PeepholeOptimizer.h:107: The parameter name "range" adds no information, so it should be removed. [readability/parameter_name] [5] ERROR: Source/JavaScriptCore/b3/B3PeepholeOptimizer.h:138: The parameter name "arguments" adds no information, so it should be removed. [readability/parameter_name] [5] Total errors found: 16 in 13 files If any of these errors are false positives, please file a bug against check-webkit-style. 1524486 3 366765 rmorisset 2019-04-04 15:46:14 -0700 Created attachment 366765 Patch Fix style issues + a build issue caused by a missing import. 1524523 4 366774 rmorisset 2019-04-04 17:06:46 -0700 Created attachment 366774 Patch Fix a missing "appendToCurrentBlock" in reduceLoadStore, that was causing a validation failure due to some orphaned constants. 1525516 5 rmorisset 2019-04-08 18:56:35 -0700 Some basic numbers, from running JetStream2 with --reportFTLCompileTimes=1 and --useConcurrentJIT=0 (to minimize noise), and averaging the times (all in ms): Baseline: 4.17321 4.16281 4.0801 4.06007 After patch: 4.11306 4.08184 4.10042 4.07414 So nothing particularly impressive, but there is no regression, and there might be a small progression. Since the main motivation for this patch was the refactoring, independent of the possible perf improvement of doing reducing on the fly in FTLOutput.h, I still think it is worth it. 1528315 6 367692 rmorisset 2019-04-17 16:00:28 -0700 Created attachment 367692 Patch Just rebased so it applies cleanly on ToT. 1530161 7 367692 fpizlo 2019-04-24 14:37:55 -0700 Comment on attachment 367692 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=367692&action=review On the one hand, I like this change. But on the other hand, it doesn't seem like it's a measurable improvement and it means that adding new strength-reduction rules may be annoying since for some opcodes you need to have a case in reduceStrength and a function on the PeepholeOptimizer. I think that we should try to have the simplest compiler we can get away with while getting great perf. So, that means not taking this change. On the other hand, if using this change in conjunction with some other change does result in a measurable improvement, then we should take it. So, that means not taking the change until there is another change that makes this one valuable. > Source/JavaScriptCore/b3/B3LowerMacros.cpp:158 > + Value* divResult = peephole.reduceDiv(m_value->type(), m_origin, m_value->child(0), m_value->child(1), true); WebKit style says you should never pass the literal true or false as an argument to a function except if the name of the function makes it obvious what the meaning of that boolean is. There are two accepted ways of side-stepping this issue: 1) Always name the argument at the callsite: bool shouldPropagateType = true; thingy->fooBar(stuff, shouldPropagateType); 2) Replace with an enum: enum ShouldPropagateTypeMode { ShouldPropagateType, ShouldNotPropagateType }; thingy->fooBar(stuff, ShouldPropagateType); The second one is preferred. 1530264 8 368204 rmorisset 2019-04-24 17:24:25 -0700 Created attachment 368204 Patch Thanks for the review. The only change is adding enums for the two places where I was passing booleans (IsChillMode and MayGiveUpMode). Following your comment, I will not ask for another review or try to land this until I write the AI phase that will use it (and which was the motivation for this patch in the first place). 366733 2019-04-04 11:36:12 -0700 2019-04-04 15:46:14 -0700 Patch patch196578 text/plain 234344 rmorisset ZGlmZiAtLWdpdCBhL1NvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cgYi9Tb3VyY2UvSmF2 YVNjcmlwdENvcmUvQ2hhbmdlTG9nCmluZGV4IDMzZmM4ZDYyYjk0Li45OTVhNGYzZGMxZiAxMDA2 NDQKLS0tIGEvU291cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZworKysgYi9Tb3VyY2UvSmF2 YVNjcmlwdENvcmUvQ2hhbmdlTG9nCkBAIC0xLDMgKzEsMTc5IEBACisyMDE5LTA0LTA0ICBSb2Jp biBNb3Jpc3NldCAgPHJtb3Jpc3NldEBhcHBsZS5jb20+CisKKyAgICAgICAgQjMgcGVlcGhvbGUg b3B0aW1pemF0aW9ucyBzaG91bGQgbGl2ZSBpbiB0aGVpciBvd24gZmlsZSwgYW5kIGJlIHVzZWQg YnkgRlRMT3V0cHV0LmNwcAorICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1 Zy5jZ2k/aWQ9MTk2NTc4CisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisK KyAgICAgICAgQ3VycmVudGx5IHRoZSBwZWVwaG9sZSBvcHRpbWl6YXRpb25zIGZvciBCMyBsaXZl 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