142977 2015-03-23 13:15:29 -0700 Add case insensitive checks to DFA bytecode 2015-03-25 16:06:39 -0700 1 1 1 Unclassified WebKit WebCore Misc. 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=142514 P2 Normal --- 1 achristensen achristensen benjamin oldest_to_newest 1079355 0 achristensen 2015-03-23 13:15:29 -0700 Many of the DFANodes have transitions that are case-insensitive, and most of the transitions are text. Making case-insensitive checks would reduce the byte code size by up to 50%. 1079358 1 249255 achristensen 2015-03-23 13:20:40 -0700 Created attachment 249255 Patch 1079520 2 achristensen 2015-03-23 17:32:53 -0700 In a large-ish real-life-ish test case, this reduced the byte code size from 93925673 to 61499201, so a memory reduction of about 30%. 1079552 3 benjamin 2015-03-23 21:39:52 -0700 (In reply to comment #2) > In a large-ish real-life-ish test case, this reduced the byte code size from > 93925673 to 61499201, so a memory reduction of about 30%. Awesome! 1079553 4 249255 benjamin 2015-03-23 21:54:59 -0700 Comment on attachment 249255 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=249255&action=review > Source/WebCore/contentextensions/DFABytecodeCompiler.cpp:-82 > - ASSERT_WITH_MESSAGE(lowValue != highValue, "A single value check should be emitted for single values."); This is odd. Is the assert no longer valid? > Source/WebCore/contentextensions/DFABytecodeCompiler.cpp:117 > + for (uint16_t i = 0; i < 128; i++) { uint16_t here. > Source/WebCore/contentextensions/DFABytecodeCompiler.cpp:128 > + uint8_t rangeMin; > + bool hasRangeMin = false; > + for (uint8_t i = 0; i < 128; i++) { uint8_t here > Source/WebCore/contentextensions/DFABytecodeCompiler.cpp:136 > + if (rangeMin >= 'A' && rangeMax <= 'Z') { Note that in WebKit, toASCIILower() is faster than toASCIIUpper(), the convention is to use lowercase for the reference. > Source/WebCore/contentextensions/DFABytecodeCompiler.cpp:138 > + for (uint16_t rangeIndex = rangeMin; rangeIndex <= rangeMax; rangeIndex++) { Back to uint16_t here > Source/WebCore/contentextensions/DFABytecodeCompiler.cpp:139 > + if (destinations[rangeMin] != destinations[rangeIndex + 'a' - 'A']) { You can just use toASCIILower() on the rangeIndex to get its lowercase value. > Source/WebCore/contentextensions/DFABytecodeCompiler.cpp:150 > + destinations[rangeIndex + 'a' - 'A'] = noDestination; ditto. > Source/WebCore/contentextensions/DFABytecodeCompiler.cpp:168 > - compileCheckForRange(rangeMin, 127, rangeDestination); > + ranges.append(Range(rangeMin, 127, destinations[rangeMin], true)); It is really weird to have a loop tail completely different from the loop body. I think a comment with your rationale would be useful here. 1079992 5 249255 achristensen 2015-03-25 11:15:34 -0700 Comment on attachment 249255 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=249255&action=review I'll upload another patch for re-reviewing a few things. >> Source/WebCore/contentextensions/DFABytecodeCompiler.cpp:117 >> + for (uint16_t i = 0; i < 128; i++) { > > uint16_t here. The keys of node.transitions are uint16_ts. >> Source/WebCore/contentextensions/DFABytecodeCompiler.cpp:128 >> + for (uint8_t i = 0; i < 128; i++) { > > uint8_t here These could be chars, but I thought it looks confusing to rely on char overflow: for (char i = 0; i > 0; ++i) >> Source/WebCore/contentextensions/DFABytecodeCompiler.cpp:136 >> + if (rangeMin >= 'A' && rangeMax <= 'Z') { > > Note that in WebKit, toASCIILower() is faster than toASCIIUpper(), the convention is to use lowercase for the reference. Is that because char toASCIILower uses a lookup table? That eliminates any conditional checks, and the table would be well-cached in the CPU. Cool! I'll use toASCIILower in the interpreter, but when compiling it would actually be faster to just add an immediate value of 32 rather than lookup a value in the table. I'll use those functions to be consistent, though, because the performance gains would not be significant here, but it might be worth looking into in some places. >> Source/WebCore/contentextensions/DFABytecodeCompiler.cpp:138 >> + for (uint16_t rangeIndex = rangeMin; rangeIndex <= rangeMax; rangeIndex++) { > > Back to uint16_t here Unintentional. Should be uint8_t. >> Source/WebCore/contentextensions/DFABytecodeCompiler.cpp:168 >> + ranges.append(Range(rangeMin, 127, destinations[rangeMin], true)); > > It is really weird to have a loop tail completely different from the loop body. > I think a comment with your rationale would be useful here. It's *your* rationale. You wrote this in the first place. 1079993 6 249416 achristensen 2015-03-25 11:17:25 -0700 Created attachment 249416 Patch 1080081 7 249416 benjamin 2015-03-25 16:02:22 -0700 Comment on attachment 249416 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=249416&action=review > Source/WebCore/contentextensions/DFABytecodeCompiler.cpp:171 > + // Ranges are appended after passing the end of them. > + // If a range goes to 127, we will have an uncommitted rangeMin because the loop does not check 128. Oh, ok, that's not what I meant :) What I meant is explaining why you don't need to check for caseInsensitive ranges in this case. 1080083 8 achristensen 2015-03-25 16:06:39 -0700 http://trac.webkit.org/changeset/181980 249255 2015-03-23 13:20:40 -0700 2015-03-25 11:17:22 -0700 Patch bug-142977-20150323132004.patch text/plain 15504 achristensen SW5kZXg6IFNvdXJjZS9XZWJDb3JlL0NoYW5nZUxvZwo9PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBTb3VyY2UvV2Vi Q29yZS9DaGFuZ2VMb2cJKHJldmlzaW9uIDE4MTg2MSkKKysrIFNvdXJjZS9XZWJDb3JlL0NoYW5n ZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDI2IEBACisyMDE1LTAzLTIzICBBbGV4IENo cmlzdGVuc2VuICA8YWNocmlzdGVuc2VuQHdlYmtpdC5vcmc+CisKKyAgICAgICAgQWRkIGNhc2Ut aW5zZW5zaXRpdmUgY2hlY2tzIHRvIERGQSBieXRlY29kZS4KKyAgICAgICAgaHR0cHM6Ly9idWdz LndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTE0Mjk3NworCisgICAgICAgIFJldmlld2VkIGJ5 IE5PQk9EWSAoT09QUyEpLgorCisgICAgICAgICogY29udGVudGV4dGVuc2lvbnMvREZBQnl0ZWNv 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