50270 2010-11-30 13:36:22 -0800 [Qt] [Symbian] Reintroduce compiler optimizations for JSC 2012-05-21 07:18:59 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) PC S60 3rd edition RESOLVED WONTFIX Performance, Qt, QtTriaged P2 Normal --- 1 laszlo.gombos norbert.leser ademar cmarcelo commit-queue hausmann kent.hansen koshuin Stanislav.Paltis suresh.voruganti oldest_to_newest 315280 0 laszlo.gombos 2010-11-30 13:36:22 -0800 Commit r53315 (http://trac.webkit.org/changeset/53315) significantly improved the performance of JavaScript execution by adding time-based optimization (-Otime) and -O3 to symbian builds. Commit r56623 (http://trac.webkit.org/changeset/56623) split up building JSC and rest of Webkit and us such we lost the optimization for JSC. This seems to be a significant performance regression between WebKit 2.0 and WebKit 2.1 releases. Perhaps we no longer need the optimizations for WebCore now that we can only turn it on for JSC. QtScript should greatly benefit from this work as well. 315302 1 75201 norbert.leser 2010-11-30 14:05:48 -0800 Created attachment 75201 Patch that adds optimization to JavaScriptCore lib The included patch adds armcc compiler flags for symbian builds to optimize JavaScriptCore library for performance (-O3 and -OTime). Also, the performance improving MMP rule ALWAYS_BUILD_AS_ARM is added conditionally for symbian builds on windows (linux builds use THUMB). This patch was verified against JS performance tests Sunspider and V8. In both cases, the optimization flag increases performance significantly (35% and 16%, respectively). 315317 2 75201 laszlo.gombos 2010-11-30 14:30:34 -0800 Comment on attachment 75201 Patch that adds optimization to JavaScriptCore lib View in context: https://bugs.webkit.org/attachment.cgi?id=75201&action=review > JavaScriptCore/ChangeLog:8 > + ChangeLog should follow the style - see http://webkit.org/coding/contributing.html#changelogs. It should look like: [Qt] [Symbian] Reintroduce compiler optimizations for JSC https://bugs.webkit.org/show_bug.cgi?id=50270 Add compiler optimization (symbian ARM target) which was lost after split from WebCore. Tested via Sunspider and V8 - both of which show significant performance improvement. Otherwise patch looks good to me, but I would like to see more discussion on if we can remove the optimizations from WebCore. 315323 3 75206 norbert.leser 2010-11-30 14:33:49 -0800 Created attachment 75206 Patch that removes superfluous compiler optimization from WebCore This patch removes the -O3 -OTime compiler optimization for Symbian ARM release targets. This one was initially introduced when JavaScriptCore was embedded in WebCore's build but is not really necessary for WebCore. Sunspider and V8 tests show no performance differences whatsoever. However, removing this optimization reduces the runtime code size by 33%. Counting the slight code size increase due to optimization in JavaScriptCore only (6%), overall we'll still have 27% less code with a total of (uncompressed) 9.8MB. 315327 4 75208 norbert.leser 2010-11-30 14:42:57 -0800 Created attachment 75208 Updated patch for WebCore with corrected Changelog styling Corrected Changelog styling 315330 5 75209 norbert.leser 2010-11-30 14:45:52 -0800 Created attachment 75209 Updated patch for JavaScriptCore with corrected Changelog styling Corrected Changelog styling 315392 6 suresh.voruganti 2010-11-30 16:35:10 -0800 Ademar, pls cherry pick the fix for Qtwebkit 2.1. This is blocker for Qtwebkit 2.1 release criteria. 315509 7 75209 laszlo.gombos 2010-11-30 21:25:17 -0800 Comment on attachment 75209 Updated patch for JavaScriptCore with corrected Changelog styling r+, thanks. 316101 8 75209 commit-queue 2010-12-02 05:58:28 -0800 Comment on attachment 75209 Updated patch for JavaScriptCore with corrected Changelog styling Clearing flags on attachment: 75209 Committed r73126: <http://trac.webkit.org/changeset/73126> 316153 9 laszlo.gombos 2010-12-02 08:02:34 -0800 (In reply to comment #3) > Created an attachment (id=75206) [details] > Patch that removes superfluous compiler optimization from WebCore > > This patch removes the -O3 -OTime compiler optimization for Symbian ARM release targets. This one was initially introduced when JavaScriptCore was embedded in WebCore's build but is not really necessary for WebCore. Sunspider and V8 tests show no performance differences whatsoever. > > However, removing this optimization reduces the runtime code size by 33%. Counting the slight code size increase due to optimization in JavaScriptCore only (6%), overall we'll still have 27% less code with a total of (uncompressed) 9.8MB. I'm in favor of this change. I also would like to give a chance to Simon and Janne to voice their opinion (CCd). Perhaps we should look into if we still need the following section in WebCore.pro symbian-abld|symbian-sbsv2 { # RO text (code) section in qtwebkit.dll exceeds allocated space for gcce udeb target. # Move RW-section base address to start from 0xE00000 instead of the toolchain default 0x400000. QMAKE_LFLAGS.ARMCC += --rw-base 0xE00000 MMP_RULES += ALWAYS_BUILD_AS_ARM } else { QMAKE_CFLAGS -= --thumb QMAKE_CXXFLAGS -= --thumb } 316387 10 ademar 2010-12-02 13:16:07 -0800 Revision r73126 cherry-picked into qtwebkit-2.1 with commit e7c8392 <http://gitorious.org/webkit/qtwebkit/commit/e7c8392> 316703 11 koshuin 2010-12-03 00:10:40 -0800 (In reply to comment #9) > Perhaps we should look into if we still need the following section in WebCore.pro > > > symbian-abld|symbian-sbsv2 { > # RO text (code) section in qtwebkit.dll exceeds allocated space for gcce udeb target. > # Move RW-section base address to start from 0xE00000 instead of the toolchain default 0x400000. > QMAKE_LFLAGS.ARMCC += --rw-base 0xE00000 > MMP_RULES += ALWAYS_BUILD_AS_ARM > } else { > QMAKE_CFLAGS -= --thumb > QMAKE_CXXFLAGS -= --thumb > } If you can build webcore as thumb then sure. Reason why it was added there was that thumb jump range was exceeded after adding -O3 and -OTime . For GCCE I think it would have to stay as GCCE generates twice the .code size than RVCT. BTW: We had late discovery that vfpu instructions need ARM mode so it might be good idea to try enabling them for jscore now with this insight in mind :) 322985 12 76719 laszlo.gombos 2010-12-15 17:54:27 -0800 Created attachment 76719 remove optimization + ALWAYS_ARM for WebCore 629074 13 cmarcelo 2012-05-21 07:18:59 -0700 Closing as WONTFIX because we do not develop QtWebKit for Symbian anymore. 75201 2010-11-30 14:05:48 -0800 2010-11-30 14:45:52 -0800 Patch that adds optimization to JavaScriptCore lib 50270_1.patch text/plain 1393 norbert.leser SW5kZXg6IEphdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwo9PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBKYXZhU2NyaXB0 Q29yZS9DaGFuZ2VMb2cJKHJldmlzaW9uIDcyODI2KQorKysgSmF2YVNjcmlwdENvcmUvQ2hhbmdl TG9nCSh3b3JraW5nIGNvcHkpCkBAIC0xLDMgKzEsMTMgQEAKKzIwMTAtMTEtMzAgIE5vcmJlcnQg TGVzZXIgIDxub3JiZXJ0Lmxlc2VyQG5va2lhLmNvbT4KKworICAgICAgICBSZXZpZXdlZCBieSBO 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