68597 2011-09-22 00:39:48 -0700 DFG JIT should support integer division 2011-09-22 15:02:16 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) All All RESOLVED FIXED P2 Normal --- 68582 1 fpizlo webkit-unassigned webkit.review.bot oldest_to_newest 471405 0 fpizlo 2011-09-22 00:39:48 -0700 It is entirely sensible to write the following piece of code: a = b / 2; And expect to be able to use 'a' as an integer, if b is always a multiple of 2 and never larger than what an integer can hold. It appears that some Kraken code does this. Currently, the DFG always assumes that all division produces doubles, which results in some bad performance in some programs. 471414 1 108290 fpizlo 2011-09-22 01:01:45 -0700 Created attachment 108290 the patch 471415 2 webkit.review.bot 2011-09-22 01:05:54 -0700 Attachment 108290 did not pass style-queue: Failed to run "['Tools/Scripts/check-webkit-style', '--diff-files', u'Source/JavaScriptCore/ChangeLog', u'Source..." exit_code: 1 Source/JavaScriptCore/jit/JITArithmetic.cpp:1054: Should have only a single space after a punctuation in a comment. [whitespace/comments] [5] Total errors found: 1 in 7 files If any of these errors are false positives, please file a bug against check-webkit-style. 471426 3 108293 fpizlo 2011-09-22 01:29:04 -0700 Created attachment 108293 the patch 471434 4 108295 fpizlo 2011-09-22 02:08:17 -0700 Created attachment 108295 the patch - more goodness added This is a small win by itself, and a big win when combined with https://bugs.webkit.org/show_bug.cgi?id=68582. Benchmark report for SunSpider, V8, and Kraken. VMs tested: "TipOfTree" at /Volumes/Data/pizlo/quinary/OpenSource/WebKitBuild/Release/jsc "IntDiv" at /Volumes/Data/pizlo/OpenSource/WebKitBuild/Release/jsc "IntDivStrCat" at /Volumes/Data/pizlo/septenary/OpenSource/WebKitBuild/Release/jsc Collected 12 samples per benchmark/VM, with 4 VM invocations per benchmark. Used 1 benchmark iteration per VM invocation for warm-up. Used the jsc-specific preciseTime() function to get microsecond-level timing. Reporting benchmark execution times with 95% confidence intervals in milliseconds. TipOfTree IntDiv IntDivStrCat IntDivStrCat v. TipOfTree SunSpider: 3d-cube 7.7031+-0.2217 ? 7.8395+-0.2910 7.6701+-0.1962 3d-morph 7.5458+-0.1330 7.5094+-0.2132 7.4666+-0.2495 might be 1.0106x faster 3d-raytrace 7.5513+-0.2014 ? 7.8452+-0.3016 7.7827+-0.1491 ? might be 1.0306x slower access-binary-trees 2.0995+-0.0579 2.0684+-0.0596 ? 2.1379+-0.1433 ? might be 1.0183x slower access-fannkuch 11.8476+-0.3710 11.7814+-0.2936 ? 11.8475+-0.3008 access-nbody 3.5674+-0.0885 3.4518+-0.0559 ? 3.5763+-0.0967 ? access-nsieve 2.5801+-0.0738 ? 2.6087+-0.0895 2.5845+-0.0629 ? bitops-3bit-bits-in-byte 1.8394+-0.0448 ? 1.8507+-0.0570 1.8055+-0.0425 might be 1.0188x faster bitops-bits-in-byte 2.8397+-0.0606 ? 2.8577+-0.0704 2.8486+-0.0719 ? bitops-bitwise-and 3.7522+-0.1308 3.6579+-0.1029 3.6303+-0.1049 might be 1.0336x faster bitops-nsieve-bits 5.3488+-0.1198 5.2944+-0.1290 ? 5.4255+-0.1257 ? might be 1.0143x slower controlflow-recursive 2.2455+-0.0651 2.2167+-0.0437 2.2005+-0.0542 might be 1.0204x faster crypto-aes 6.8923+-0.3697 6.3176+-0.2402 6.1573+-0.1484 ^ definitely 1.1194x faster crypto-md5 2.8049+-0.0709 ^ 2.5663+-0.0668 2.4669+-0.0729 ^ definitely 1.1370x faster crypto-sha1 2.3478+-0.0652 ^ 2.1351+-0.0607 ? 2.1476+-0.0806 ^ definitely 1.0932x faster date-format-tofte 10.3161+-0.2810 10.2830+-0.2989 ? 10.4249+-0.2628 ? might be 1.0105x slower date-format-xparb 8.7798+-0.2838 8.7494+-0.2496 ? 8.9220+-0.2599 ? might be 1.0162x slower math-cordic 6.3076+-0.1537 6.1111+-0.1149 6.0745+-0.0764 ^ definitely 1.0384x faster math-partial-sums 7.3659+-0.1267 ? 7.4812+-0.1393 ? 7.6897+-0.2075 ? might be 1.0440x slower math-spectral-norm 2.7030+-0.1058 ! 2.9985+-0.0863 ? 3.0546+-0.0794 ! definitely 1.1300x slower regexp-dna 10.8762+-0.1921 10.8190+-0.1663 ? 10.9030+-0.2224 ? string-base64 5.8533+-0.1371 ? 5.8618+-0.1759 ? 5.9906+-0.2396 ? might be 1.0235x slower string-fasta 7.2075+-0.1744 7.1327+-0.1970 7.1087+-0.1609 might be 1.0139x faster string-tagcloud 11.9179+-0.3311 ? 11.9804+-0.3916 ? 12.0016+-0.3266 ? string-unpack-code 18.7440+-0.3804 ? 18.8508+-0.5263 ? 19.2606+-0.6360 ? might be 1.0276x slower string-validate-input 6.4930+-0.0958 ? 6.6237+-0.2460 6.4775+-0.1372 <arithmetic> 6.4435+-0.0377 6.4189+-0.0338 ? 6.4483+-0.0393 ? <geometric> 5.3328+-0.0319 5.2913+-0.0219 ? 5.3018+-0.0402 <harmonic> 4.3898+-0.0353 4.3388+-0.0330 4.3374+-0.0541 might be 1.0121x faster TipOfTree IntDiv IntDivStrCat IntDivStrCat v. TipOfTree V8: crypto 71.2496+-0.2918 ? 71.3862+-0.3429 71.1184+-0.5196 deltablue 237.3015+-1.4425 ? 237.3798+-1.0827 236.5956+-1.3604 earley-boyer 88.2273+-0.3942 88.1260+-0.3059 87.9492+-0.3159 raytrace 64.1057+-0.6186 ? 65.0615+-0.5036 ^ 62.6563+-0.4224 ^ definitely 1.0231x faster regexp 105.5161+-0.4444 ! 106.6996+-0.3355 ! 108.3552+-0.6639 ! definitely 1.0269x slower richards 198.5336+-0.7411 ? 199.2889+-0.7026 199.0919+-0.6748 ? splay 98.3329+-0.2213 ? 98.5661+-0.5356 98.0713+-0.4491 <arithmetic> 123.3238+-0.2493 ? 123.7869+-0.2621 123.4054+-0.1661 ? <geometric> 110.1665+-0.2139 ! 110.6913+-0.2509 ^ 110.1008+-0.1791 <harmonic> 100.1846+-0.2352 ! 100.7525+-0.2618 ^ 99.8989+-0.2373 TipOfTree IntDiv IntDivStrCat IntDivStrCat v. TipOfTree Kraken: ai-astar 616.6539+-2.9734 611.4591+-4.2299 ? 615.3805+-4.1636 audio-beat-detection 467.0274+-4.0021 ^ 377.9344+-1.6609 ^ 204.5658+-1.0722 ^ definitely 2.2830x faster audio-dft 422.0664+-1.7690 421.1265+-2.1315 419.6968+-2.5885 audio-fft 363.5815+-2.0561 ^ 312.9141+-0.8157 ^ 141.5586+-0.9472 ^ definitely 2.5684x faster audio-oscillator 254.2253+-1.3820 ! 258.3617+-1.3677 ? 258.4752+-1.0439 ! definitely 1.0167x slower imaging-darkroom 422.4535+-1.9687 420.4771+-1.1829 ? 421.7214+-0.7025 imaging-desaturate 208.7662+-0.5285 ? 208.9123+-0.7579 ? 210.1087+-1.2589 ? imaging-gaussian-blur 594.3785+-1.2263 594.0332+-0.8333 ! 598.2852+-3.3919 ? json-parse-financial 48.0277+-0.2236 ! 48.6539+-0.3093 48.6490+-0.2884 ! definitely 1.0129x slower json-stringify-tinderbox 68.8110+-0.2238 ^ 68.0999+-0.3462 ! 70.1338+-0.5934 ! definitely 1.0192x slower stanford-crypto-aes 137.5441+-0.4898 ^ 134.0939+-1.0359 ? 135.0720+-0.7700 ^ definitely 1.0183x faster stanford-crypto-ccm 109.4925+-0.5785 ^ 104.6828+-0.9352 ! 105.8698+-0.2324 ^ definitely 1.0342x faster stanford-crypto-pbkdf2 208.6068+-3.2304 204.5755+-0.9357 ? 205.3682+-1.0130 might be 1.0158x faster stanford-crypto-sha256-iterative 84.5903+-0.2556 ? 84.9048+-0.5000 ? 85.2254+-0.4590 ? <arithmetic> 286.1589+-0.5195 ^ 275.0164+-0.4482 ^ 251.4365+-0.4675 ^ definitely 1.1381x faster <geometric> 217.1089+-0.4842 ^ 210.3265+-0.3279 ^ 191.2333+-0.3325 ^ definitely 1.1353x faster <harmonic> 155.4981+-0.3995 ^ 153.0205+-0.3357 ^ 144.4740+-0.3776 ^ definitely 1.0763x faster TipOfTree IntDiv IntDivStrCat IntDivStrCat v. TipOfTree All benchmarks: <arithmetic> 107.1707+-0.1773 ^ 103.9070+-0.1572 ^ 96.8426+-0.1626 ^ definitely 1.1066x faster <geometric> 25.2527+-0.0971 ^ 24.9250+-0.0673 ^ 24.2354+-0.1112 ^ definitely 1.0420x faster <harmonic> 7.7267+-0.0608 7.6381+-0.0568 7.6281+-0.0927 might be 1.0129x faster 471676 5 108295 darin 2011-09-22 10:31:50 -0700 Comment on attachment 108295 the patch - more goodness added View in context: https://bugs.webkit.org/attachment.cgi?id=108295&action=review > Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp:549 > + // have speculatins in place that take care of that separately. We only Typo: speculations > Source/JavaScriptCore/jit/JITArithmetic.cpp:1058 > + // in the heap to go doubly, resulting in double predictions getting predicted to all What’s "go doubly"? Do you just mean "go double"? Or get a double value? > Source/JavaScriptCore/jit/JITArithmetic.cpp:1062 > + // FIXME: This will fail to do its magic if the result is zero. This comment would be clearer if “fail to do its magic” was replaced by a more specific phrase. 471744 6 fpizlo 2011-09-22 11:44:57 -0700 > > Source/JavaScriptCore/jit/JITArithmetic.cpp:1058 > > + // in the heap to go doubly, resulting in double predictions getting predicted to all > > What’s "go doubly"? Do you just mean "go double"? Or get a double value? I've been using that to distinguish between something having actual honest doubles (i.e. formatted as double because they cannot be represented as integer) and having an odd mix of integers formatted as int32 and integers formatted as double for no reason other than somewhere in the code we were too lazy to realize we were producing integers. > > > Source/JavaScriptCore/jit/JITArithmetic.cpp:1062 > > + // FIXME: This will fail to do its magic if the result is zero. > > This comment would be clearer if “fail to do its magic” was replaced by a more specific phrase. "fail to do its magic" = convert the double back to an integer. I'll fix that comment. 471881 7 fpizlo 2011-09-22 15:02:16 -0700 Landed in r95754, with changes as per Darin's suggestions. 108290 2011-09-22 01:01:45 -0700 2011-09-22 01:29:04 -0700 the patch intdiv_patch_1.diff text/plain 10286 fpizlo SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gOTU3MDIpCisrKyBTb3VyY2Uv SmF2YVNjcmlwdENvcmUvQ2hhbmdlTG9nCSh3b3JraW5nIGNvcHkpCkBAIC0xLDMgKzEsMzAgQEAK KzIwMTEtMDktMjIgIEZpbGlwIFBpemxvICA8ZnBpemxvQGFwcGxlLmNvbT4KKworICAgICAgICBE RkcgSklUIHNob3VsZCBzdXBwb3J0IGludGVnZXIgZGl2aXNpb24KKyAgICAgICAgaHR0cHM6Ly9i dWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTY4NTk3CisKKyAgICAgICAgUmV2aWV3ZWQg YnkgTk9CT0RZIChPT1BTISkuCisgICAgICAgIAorICAgICAgICBUaGlzIGFkZHMgc3VwcG9ydCBm b3IgQXJpdGhEaXYgc3BlY3VsYXRpbmcgaW50ZWdlciwgYW5kIHNwZWN1bGF0aW5nCisgICAgICAg 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