165857 2016-12-14 10:23:46 -0800 [JSC] Optimize Kraken stringify 2016-12-15 02:29:36 -0800 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 ysuzuki ysuzuki benjamin cdumez cmarcelo commit-queue darin dbates saam oldest_to_newest 1259803 0 ysuzuki 2016-12-14 10:23:46 -0800 In Kraken's stringify test, roughly 30% of time is used by StringBuilder::appendQuotedJSONString. I think we have room for optimization in this function. I have a patch that shows 1% performance improvement in Linux box, but I need to test it with macOS clang. 1259806 1 297100 ysuzuki 2016-12-14 10:25:11 -0800 Created attachment 297100 Patch WIP: Linux box shows 1% improvement 1259813 2 297101 ysuzuki 2016-12-14 10:41:34 -0800 Created attachment 297101 Patch WIP: Linux box shows 4.6% improvement 1260084 3 297179 ysuzuki 2016-12-15 00:25:07 -0800 Created attachment 297179 Patch 1260091 4 297183 ysuzuki 2016-12-15 00:50:33 -0800 Created attachment 297183 Patch 1260098 5 297183 darin 2016-12-15 01:18:35 -0800 Comment on attachment 297183 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=297183&action=review > Source/WTF/wtf/text/StringBuilder.cpp:429 > + if (LIKELY(character != '"' && character != '\\' && character > 0x1F)) { For 8-bit characters can we make it even faster with a 256 byte array? 1260105 6 297183 ysuzuki 2016-12-15 02:02:43 -0800 Comment on attachment 297183 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=297183&action=review >> Source/WTF/wtf/text/StringBuilder.cpp:429 >> + if (LIKELY(character != '"' && character != '\\' && character > 0x1F)) { > > For 8-bit characters can we make it even faster with a 256 byte array? I've created additional two versions. 1. Bit packed array version. 451 static constexpr const uint64_t masks[4] = { 452 0xfffffffb00000000ULL, 453 0xffffffffefffffffULL, 454 0xffffffffffffffffULL, 455 0xffffffffffffffffULL, 456 }; 457 458 if (masks[character >> 6] & (1ULL << (character & 0b111111))) { 459 *output++ = character; 460 continue; 461 } 2. 256 bytes array version. The result on MBP. 256array branch packed json-stringify-tinderbox 27.237+-0.212 27.157+-0.196 ? 27.239+-0.213 Overall, they show the same results. I think this is because branch prediction works well. So I think the current version is OK. BTW, if we put it on the Aarch64 cores, it could show the different results because Intel cores has sophisticated branch predictions. 1260107 7 297183 commit-queue 2016-12-15 02:29:31 -0800 Comment on attachment 297183 Patch Clearing flags on attachment: 297183 Committed r209858: <http://trac.webkit.org/changeset/209858> 1260108 8 commit-queue 2016-12-15 02:29:36 -0800 All reviewed patches have been landed. Closing bug. 297100 2016-12-14 10:25:11 -0800 2016-12-14 10:41:31 -0800 Patch bug-165857-20161215032419.patch text/plain 2729 ysuzuki U3VidmVyc2lvbiBSZXZpc2lvbjogMjA5ODAyCmRpZmYgLS1naXQgYS9Tb3VyY2UvV1RGL0NoYW5n ZUxvZyBiL1NvdXJjZS9XVEYvQ2hhbmdlTG9nCmluZGV4IGYyZWM4NDI5ZmQyZjNkNWU0ZjQxMjkx NWExZTYyZWNhYjc2MmFiYjEuLjlhZWU2ZDQ0NjFjYzUwY2I2ZDhlNjg3MDZjMjU3ZmIyYzhkMDE0 NGYgMTAwNjQ0Ci0tLSBhL1NvdXJjZS9XVEYvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9XVEYvQ2hh bmdlTG9nCkBAIC0xLDMgKzEsMTMgQEAKKzIwMTYtMTItMTQgIFl1c3VrZSBTdXp1a2kgIDx1dGF0 YW5lLnRlYUBnbWFpbC5jb20+CisKKyAgICAgICAgW0pTQ10gT3B0aW1pemUgS3Jha2VuIHN0cmlu Z2lmeQorICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MTY1 ODU3CisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisKKyAgICAgICAgKiB3 dGYvdGV4dC9TdHJpbmdCdWlsZGVyLmNwcDoKKyAgICAgICAgKFdURjo6YXBwZW5kUXVvdGVkSlNP TlN0cmluZ0ludGVybmFsKToKKwogMjAxNi0xMi0xNCAgRW5yaXF1ZSBPY2HDsWEgR29uesOhbGV6 ICA8ZW9jYW5oYUBpZ2FsaWEuY29tPgogCiAgICAgICAgIFJFR1JFU1NJT04ocjIwNzg3OS0yMDc4 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