47384 2010-10-07 16:34:19 -0700 ARMv7 JIT should generated conditional branches when possible 2010-10-13 23:45:42 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Other OS X 10.5 RESOLVED FIXED P2 Normal --- 1 david_goodwin webkit-unassigned commit-queue eric ggaren oliver webkit.review.bot oldest_to_newest 291320 0 david_goodwin 2010-10-07 16:34:19 -0700 Current, ARMv7 JIT generates a conditional branch using IT with an unconditional branch. The JIT should instead use a conditional branch when possible. 291321 1 70170 david_goodwin 2010-10-07 16:40:12 -0700 Created attachment 70170 patch to use conditional branches when possible 291324 2 webkit.review.bot 2010-10-07 16:46:00 -0700 Attachment 70170 did not pass style-queue: Failed to run "['WebKitTools/Scripts/check-webkit-style']" exit_code: 1 JavaScriptCore/assembler/ARMv7Assembler.h:751: Tests for true/false, null/non-null, and zero/non-zero should all be done without equality comparisons. [readability/comparison_to_zero] [5] JavaScriptCore/assembler/ARMv7Assembler.h:759: Tests for true/false, null/non-null, and zero/non-zero should all be done without equality comparisons. [readability/comparison_to_zero] [5] JavaScriptCore/assembler/ARMv7Assembler.h:766: Tests for true/false, null/non-null, and zero/non-zero should all be done without equality comparisons. [readability/comparison_to_zero] [5] JavaScriptCore/assembler/ARMv7Assembler.h:2161: JUMP_TEMPORARY_REGISTER is incorrectly named. Don't use underscores in your identifier names. [readability/naming] [4] Total errors found: 4 in 5 files If any of these errors are false positives, please file a bug against check-webkit-style. 291994 3 70170 oliver 2010-10-08 18:10:22 -0700 Comment on attachment 70170 patch to use conditional branches when possible View in context: https://bugs.webkit.org/attachment.cgi?id=70170&action=review You need a more detailed changelog but other than that this looks good > JavaScriptCore/ChangeLog:7 > + You should have a description of what you're changing in a patch this size. 292528 4 70443 david_goodwin 2010-10-11 10:19:13 -0700 Created attachment 70443 Add more descriptive ChangeLog entry 292531 5 webkit.review.bot 2010-10-11 10:21:09 -0700 Attachment 70443 did not pass style-queue: Failed to run "['WebKitTools/Scripts/check-webkit-style']" exit_code: 1 JavaScriptCore/ChangeLog:8: Line contains tab character. [whitespace/tab] [5] JavaScriptCore/ChangeLog:9: Line contains tab character. [whitespace/tab] [5] JavaScriptCore/ChangeLog:10: Line contains tab character. [whitespace/tab] [5] JavaScriptCore/ChangeLog:11: Line contains tab character. [whitespace/tab] [5] JavaScriptCore/ChangeLog:12: Line contains tab character. [whitespace/tab] [5] JavaScriptCore/ChangeLog:13: Line contains tab character. [whitespace/tab] [5] JavaScriptCore/ChangeLog:14: Line contains tab character. [whitespace/tab] [5] JavaScriptCore/ChangeLog:16: Line contains tab character. [whitespace/tab] [5] JavaScriptCore/ChangeLog:17: Line contains tab character. [whitespace/tab] [5] JavaScriptCore/ChangeLog:18: Line contains tab character. [whitespace/tab] [5] JavaScriptCore/assembler/ARMv7Assembler.h:751: Tests for true/false, null/non-null, and zero/non-zero should all be done without equality comparisons. [readability/comparison_to_zero] [5] JavaScriptCore/assembler/ARMv7Assembler.h:759: Tests for true/false, null/non-null, and zero/non-zero should all be done without equality comparisons. [readability/comparison_to_zero] [5] JavaScriptCore/assembler/ARMv7Assembler.h:766: Tests for true/false, null/non-null, and zero/non-zero should all be done without equality comparisons. [readability/comparison_to_zero] [5] JavaScriptCore/assembler/ARMv7Assembler.h:2161: JUMP_TEMPORARY_REGISTER is incorrectly named. Don't use underscores in your identifier names. [readability/naming] [4] Total errors found: 14 in 5 files If any of these errors are false positives, please file a bug against check-webkit-style. 292539 6 70449 david_goodwin 2010-10-11 10:26:08 -0700 Created attachment 70449 more descriptive ChangeLog (now without tabs, sigh) 292543 7 webkit.review.bot 2010-10-11 10:28:51 -0700 Attachment 70449 did not pass style-queue: Failed to run "['WebKitTools/Scripts/check-webkit-style']" exit_code: 1 JavaScriptCore/assembler/ARMv7Assembler.h:751: Tests for true/false, null/non-null, and zero/non-zero should all be done without equality comparisons. [readability/comparison_to_zero] [5] JavaScriptCore/assembler/ARMv7Assembler.h:759: Tests for true/false, null/non-null, and zero/non-zero should all be done without equality comparisons. [readability/comparison_to_zero] [5] JavaScriptCore/assembler/ARMv7Assembler.h:766: Tests for true/false, null/non-null, and zero/non-zero should all be done without equality comparisons. [readability/comparison_to_zero] [5] JavaScriptCore/assembler/ARMv7Assembler.h:2161: JUMP_TEMPORARY_REGISTER is incorrectly named. Don't use underscores in your identifier names. [readability/naming] [4] Total errors found: 4 in 5 files If any of these errors are false positives, please file a bug against check-webkit-style. 292619 8 70449 oliver 2010-10-11 12:59:14 -0700 Comment on attachment 70449 more descriptive ChangeLog (now without tabs, sigh) View in context: https://bugs.webkit.org/attachment.cgi?id=70449&action=review I'm not really comfortable with the new jumptype naming schem -- could you explain what patchable means? you should also replace the a == 0 checks with !a > JavaScriptCore/assembler/ARMv7Assembler.h:482 > + enum JumpType { JumpFixed, JumpNoCondition, JumpCondition, PatchableJumpNoCondition, PatchableJumpCondition, JumpTypeCount }; > + enum JumpLinkType { LinkInvalid, LinkJumpT1, LinkJumpT2, LinkJumpT3, I don't really get this naming scheme -- what's meant by patchable vs. non patchable? 293445 9 david_goodwin 2010-10-13 08:51:16 -0700 A patchable jump is one that is not compressed because it may need to be patched after code generation. I'm happy to change the names to anything you think is more appropriate. 293549 10 ggaren 2010-10-13 11:23:41 -0700 Here's an alternative: 1. JumpConditionFixedSize, JumpNoConditionFixedSize. "Fixed size" is a little more specific and modular, since you don't have to know that the patching machinery relies on fixed sized instructions in order to know what "fixed size" means. Using a suffix helps communicate that these are just like the other similarly named jumps, with the modifier of having a fixed size. I think it would also be helpful to readability to add a "canCompact(JumpType)" helper function. That way, branch compacting code can just do this: if (!canCompact(jumpType)) // bail out And if we add / remove jump types, we only need to modify the central helper function, not each of these clients. We can also place the comment explaining which jump types can't compact in one place. 293663 11 oliver 2010-10-13 13:16:09 -0700 (In reply to comment #10) > Here's an alternative: > > 1. JumpConditionFixedSize, JumpNoConditionFixedSize. "Fixed size" is a little more specific and modular, since you don't have to know that the patching machinery relies on fixed sized instructions in order to know what "fixed size" means. Using a suffix helps communicate that these are just like the other similarly named jumps, with the modifier of having a fixed size. > > I think it would also be helpful to readability to add a "canCompact(JumpType)" helper function. That way, branch compacting code can just do this: > > if (!canCompact(jumpType)) > // bail out > > And if we add / remove jump types, we only need to modify the central helper function, not each of these clients. We can also place the comment explaining which jump types can't compact in one place. These seem like good names, and canCompact is a good addition. My primary issue with the Patchable prefixes were that I felt you could reasonably interpret "Patchable" as meaning the linker was able to patch the link into another form. David you may find it helpful to run the style checker before you upload, it's in the normal checkout at: WebKitTools/Scripts/check-webkit-style There's also the webkit-patch script that can automate the process of submitting a patch if you're interested. 293705 12 david_goodwin 2010-10-13 14:14:51 -0700 (In reply to comment #11) > David you may find it helpful to run the style checker before you upload, it's in the normal checkout at: > WebKitTools/Scripts/check-webkit-style > > There's also the webkit-patch script that can automate the process of submitting a patch if you're interested. Yeah, I use that, but there are a lot of violations in the file already so it takes some work to weed out the new ones that I've introduced. Plus something like the JUMP_TEMPORARY_REGISTER I assume I can't fix because I am just using something that is already defined and in use elsewhere in the code. 293708 13 oliver 2010-10-13 14:20:46 -0700 (In reply to comment #12) > (In reply to comment #11) > > David you may find it helpful to run the style checker before you upload, it's in the normal checkout at: > > WebKitTools/Scripts/check-webkit-style > > > > There's also the webkit-patch script that can automate the process of submitting a patch if you're interested. > > Yeah, I use that, but there are a lot of violations in the file already so it takes some work to weed out the new ones that I've introduced. Plus something like the JUMP_TEMPORARY_REGISTER I assume I can't fix because I am just using something that is already defined and in use elsewhere in the code. Ah i forgot it did that :-/ if you do: webkit-patch post Assuming you haven't made any changes to the header of the changelog (the bug url, etc) it should correctly post the changelog to the correct bug. Before it does that though it will run check-webkit-style in such a way that it only complains about errors in the diff. I wonder if check-webkit-style works "correctly" if you just run it on a diff? 293748 14 70672 david_goodwin 2010-10-13 15:25:03 -0700 Created attachment 70672 Patch 293750 15 70672 oliver 2010-10-13 15:27:14 -0700 Comment on attachment 70672 Patch r=me! 293752 16 webkit.review.bot 2010-10-13 15:28:06 -0700 Attachment 70672 did not pass style-queue: Failed to run "['WebKitTools/Scripts/check-webkit-style']" exit_code: 1 JavaScriptCore/assembler/ARMv7Assembler.h:2169: JUMP_TEMPORARY_REGISTER is incorrectly named. Don't use underscores in your identifier names. [readability/naming] [4] Total errors found: 1 in 5 files If any of these errors are false positives, please file a bug against check-webkit-style. 293894 17 70672 commit-queue 2010-10-13 18:22:21 -0700 Comment on attachment 70672 Patch Rejecting patch 70672 from commit-queue. Failed to run "['./WebKitTools/Scripts/webkit-patch', '--status-host=queues.webkit.org', 'build-and-test', '--no-clean', '--no-update', '--test', '--quiet', '--non-interactive']" exit_code: 2 Last 500 characters of output: ul. Files=14, Tests=304, 1 wallclock secs ( 0.74 cusr + 0.17 csys = 0.91 CPU) Running build-dumprendertree Compiling Java tests make: Nothing to be done for `default'. Running tests from /Projects/CommitQueue/LayoutTests Testing 21548 test cases. http/tests/incremental/frame-focus-before-load.html -> failed Exiting early after 1 failures. 20655 tests run. 431.05s total testing time 20654 test cases (99%) succeeded 1 test case (<1%) had incorrect layout 34 test cases (<1%) had stderr output Full output: http://queues.webkit.org/results/4434017 293913 18 70672 oliver 2010-10-13 19:52:56 -0700 Comment on attachment 70672 Patch /me stabs commit queue and tries again 293919 19 eric 2010-10-13 20:14:51 -0700 You should really stab the flaky tests. :) I'm working on making the commit-queue *even* less sensitive to flaky tests. It requires tests to flake twice in a row to have such a failure currently. 293980 20 70672 commit-queue 2010-10-13 23:45:35 -0700 Comment on attachment 70672 Patch Clearing flags on attachment: 70672 Committed r69743: <http://trac.webkit.org/changeset/69743> 293981 21 commit-queue 2010-10-13 23:45:42 -0700 All reviewed patches have been landed. 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