156603 2016-04-14 15:13:25 -0700 [JSC] ReduceDoubleToFloat should work accross Phis 2016-04-17 22:12:57 -0700 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 benjamin benjamin commit-queue fpizlo keith_miller mark.lam msaboff saam oldest_to_newest 1183895 0 benjamin 2016-04-14 15:13:25 -0700 [JSC] ReduceDoubleToFloat should work accross Phis 1183903 1 276440 benjamin 2016-04-14 15:27:48 -0700 Created attachment 276440 Patch 1183905 2 commit-queue 2016-04-14 15:30:47 -0700 Attachment 276440 did not pass style-queue: ERROR: Source/JavaScriptCore/b3/testb3.cpp:4236: Consider using CHECK_EQ instead of CHECK(a == b) [readability/check] [2] ERROR: Source/JavaScriptCore/b3/testb3.cpp:4236: Tests for true/false, null/non-null, and zero/non-zero should all be done without equality comparisons. [readability/comparison_to_zero] [5] Total errors found: 2 in 5 files If any of these errors are false positives, please file a bug against check-webkit-style. 1183906 3 276441 benjamin 2016-04-14 15:31:19 -0700 Created attachment 276441 Patch 1183907 4 benjamin 2016-04-14 15:31:45 -0700 1.5% faster on Unity3D. 2.8% faster on box2d-throughput-f32 Conf#1 Conf#2 SunSpider: 3d-cube 5.0630+-0.0857 ? 5.1213+-0.0912 ? might be 1.0115x slower 3d-morph 5.1391+-0.0193 ? 5.2100+-0.0776 ? might be 1.0138x slower 3d-raytrace 5.5978+-0.0689 ? 5.6257+-0.0604 ? access-binary-trees 2.1249+-0.0241 2.1194+-0.0183 access-fannkuch 5.9132+-0.0966 5.8171+-0.1002 might be 1.0165x faster access-nbody 2.5805+-0.0718 2.5222+-0.0056 might be 1.0231x faster access-nsieve 3.0710+-0.0510 3.0691+-0.0538 bitops-3bit-bits-in-byte 1.1362+-0.0128 1.1247+-0.0095 might be 1.0102x faster bitops-bits-in-byte 2.7992+-0.0283 ? 2.8100+-0.0510 ? bitops-bitwise-and 2.1385+-0.0990 2.0785+-0.0485 might be 1.0288x faster bitops-nsieve-bits 3.1204+-0.0447 3.1090+-0.0156 controlflow-recursive 2.3639+-0.0231 2.3509+-0.0494 crypto-aes 4.0411+-0.0868 4.0368+-0.0466 crypto-md5 2.4738+-0.0330 ? 2.5009+-0.0602 ? might be 1.0109x slower crypto-sha1 2.3662+-0.0380 2.3448+-0.0259 date-format-tofte 6.3992+-0.0751 ? 6.5363+-0.1850 ? might be 1.0214x slower date-format-xparb 4.7750+-0.1088 ? 4.8119+-0.0967 ? math-cordic 2.8944+-0.0293 2.8840+-0.0174 math-partial-sums 4.8608+-0.0467 ? 4.9004+-0.0901 ? math-spectral-norm 2.0161+-0.0368 1.9980+-0.0088 regexp-dna 6.3816+-0.1312 ? 6.4131+-0.1861 ? string-base64 4.9389+-0.1949 ? 5.0019+-0.2586 ? might be 1.0128x slower string-fasta 5.9164+-0.1130 5.8000+-0.0569 might be 1.0201x faster string-tagcloud 8.1603+-0.0850 8.1314+-0.0860 string-unpack-code 19.3697+-0.4996 ? 19.7377+-0.6318 ? might be 1.0190x slower string-validate-input 4.4263+-0.0927 4.4134+-0.1178 <arithmetic> 4.6180+-0.0226 ? 4.6334+-0.0330 ? might be 1.0033x slower Conf#1 Conf#2 Octane: encrypt 0.16302+-0.00072 0.16235+-0.00062 decrypt 2.84583+-0.00869 2.84089+-0.00306 deltablue x2 0.13999+-0.00195 0.13934+-0.00196 earley 0.28653+-0.00112 ? 0.28696+-0.00135 ? boyer 5.03678+-0.03691 5.02123+-0.05303 navier-stokes x2 5.00274+-0.00923 ? 5.01018+-0.01144 ? raytrace x2 0.79686+-0.00220 ? 0.79716+-0.00250 ? richards x2 0.08333+-0.00051 ? 0.08348+-0.00042 ? splay x2 0.34197+-0.00270 0.34191+-0.00165 regexp x2 15.83075+-0.10910 15.79311+-0.11414 pdfjs x2 39.62902+-0.28598 ? 39.74836+-0.27570 ? mandreel x2 42.53394+-0.11733 42.36217+-0.11472 gbemu x2 24.25185+-0.05847 ? 24.29922+-0.14632 ? closure 0.53462+-0.00215 0.53338+-0.00160 jquery 6.83363+-0.02290 ? 6.87418+-0.02429 ? box2d x2 9.18677+-0.03212 ? 9.26675+-0.05235 ? zlib x2 357.60263+-4.57913 355.81132+-3.04523 typescript x2 619.53806+-2.20658 618.44664+-1.75235 <geometric> 5.02325+-0.00644 5.02243+-0.00712 might be 1.0002x faster Conf#1 Conf#2 Kraken: ai-astar 88.233+-0.805 88.147+-0.868 audio-beat-detection 42.004+-0.068 ? 42.064+-0.090 ? audio-dft 99.891+-1.072 99.869+-1.198 audio-fft 32.905+-0.269 32.834+-0.171 audio-oscillator 47.920+-0.127 ? 47.926+-0.049 ? imaging-darkroom 60.327+-0.173 ^ 59.968+-0.106 ^ definitely 1.0060x faster imaging-desaturate 45.300+-0.161 45.242+-0.133 imaging-gaussian-blur 64.753+-1.804 64.115+-2.095 json-parse-financial 37.782+-0.091 ^ 37.230+-0.232 ^ definitely 1.0148x faster json-stringify-tinderbox 24.799+-1.453 22.849+-0.701 might be 1.0853x faster stanford-crypto-aes 39.370+-0.432 39.369+-0.408 stanford-crypto-ccm 32.723+-0.580 32.631+-0.857 stanford-crypto-pbkdf2 96.461+-0.334 ? 96.972+-0.934 ? stanford-crypto-sha256-iterative 37.037+-0.538 36.835+-0.239 <arithmetic> 53.536+-0.193 53.289+-0.238 might be 1.0046x faster Conf#1 Conf#2 AsmBench: bigfib.cpp 443.7581+-1.3842 ? 444.4828+-2.2829 ? cray.c 364.3141+-1.2121 ? 365.1794+-1.8583 ? dry.c 443.5284+-23.1532 427.9712+-4.1389 might be 1.0364x faster FloatMM.c 725.7166+-3.5496 ? 726.8204+-3.3913 ? gcc-loops.cpp 3712.3209+-3.7844 ? 3720.0697+-12.8160 ? n-body.c 808.3756+-2.3792 ? 809.4591+-3.0377 ? Quicksort.c 397.8874+-1.1236 ? 398.7238+-1.4567 ? stepanov_container.cpp 3332.8912+-15.0782 3328.9234+-13.3996 Towers.c 272.8819+-0.5958 272.7597+-0.2360 <geometric> 726.3510+-3.9406 724.5353+-1.0660 might be 1.0025x faster Conf#1 Conf#2 Geomean of preferred means: <scaled-result> 30.8175+-0.0684 30.7869+-0.0589 might be 1.0010x faster 1183908 5 commit-queue 2016-04-14 15:33:23 -0700 Attachment 276441 did not pass style-queue: ERROR: Source/JavaScriptCore/b3/testb3.cpp:4236: Consider using CHECK_EQ instead of CHECK(a == b) [readability/check] [2] ERROR: Source/JavaScriptCore/b3/testb3.cpp:4236: Tests for true/false, null/non-null, and zero/non-zero should all be done without equality comparisons. [readability/comparison_to_zero] [5] Total errors found: 2 in 5 files If any of these errors are false positives, please file a bug against check-webkit-style. 1183928 6 276441 fpizlo 2016-04-14 16:10:22 -0700 Comment on attachment 276441 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=276441&action=review I think I buy this. I will read it again before r+'ing. Maybe worth it to get someone else to look at it, too. Maybe Saam. > Source/JavaScriptCore/ChangeLog:10 > + This patch extends B3's ReduceDoubleToFloat phase to work accross > + Upsilon-Phis. This is important to optimize loops and some crazy cases. Awesome. 1183980 7 276441 saam 2016-04-14 19:40:28 -0700 Comment on attachment 276441 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=276441&action=review I think I understand mostly what's going on. I've added some comments. I want to read it and grok it a bit more, but I have to catch a plane now. I'll look more later. > Source/JavaScriptCore/ChangeLog:15 > + Float @2 = DoubleToPhi(@1) Typo: DoubleToFloat > Source/JavaScriptCore/ChangeLog:22 > + but the user of the value does not do DoubleToPhi. Typo here too > Source/JavaScriptCore/b3/B3ReduceDoubleToFloat.cpp:176 > + changedPhiState = true; This is dead code. > Source/JavaScriptCore/b3/B3ReduceDoubleToFloat.cpp:216 > + || (value->type() == Double Indentation is off here. This might be easier to read if it were broken up into individual if statements. > Source/JavaScriptCore/b3/B3ReduceDoubleToFloat.cpp:346 > + if (phi->type() == Float && child->type() == Double The "child->type() == Double" should always be true, right? Maybe make it an assertion > Source/JavaScriptCore/b3/B3ReduceDoubleToFloat.cpp:388 > + upsilon->child(0) = newChild; I have a question about B3 here: What happens to the old value if we were the only reference of it? Are all values allocated under some arena and are cleaned up after compilation? 1184120 8 benjamin 2016-04-15 10:47:02 -0700 (In reply to comment #7) > > Source/JavaScriptCore/b3/B3ReduceDoubleToFloat.cpp:346 > > + if (phi->type() == Float && child->type() == Double > > The "child->type() == Double" should always be true, right? Maybe make it an > assertion Remember that we are not in a valid state in simplify(). You can have a child that was already converted to float by an other node. It would be fine to convert it again, but changedPhi has to tell the truth. > > Source/JavaScriptCore/b3/B3ReduceDoubleToFloat.cpp:388 > > + upsilon->child(0) = newChild; > > I have a question about B3 here: > What happens to the old value if we were the only reference of it? > Are all values allocated under some arena and are cleaned up after > compilation? All the values are owned by the Procedure. The dead values stick around until you call deleteValue(). 1184502 9 276441 fpizlo 2016-04-17 12:52:29 -0700 Comment on attachment 276441 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=276441&action=review >> Source/JavaScriptCore/b3/B3ReduceDoubleToFloat.cpp:216 >> + || (value->type() == Double > > Indentation is off here. > This might be easier to read if it were broken up into individual if statements. I believe that this indentation style is what we're supposed to do, but I agree that this would read easier if it was broken up. >> Source/JavaScriptCore/b3/B3ReduceDoubleToFloat.cpp:388 >> + upsilon->child(0) = newChild; > > I have a question about B3 here: > What happens to the old value if we were the only reference of it? > Are all values allocated under some arena and are cleaned up after compilation? Values are owned by Procedure and it will delete all of them when the Procedure is deleted. More precisely, Values can be in one of these states: 1) Not owned by any Procedure. We don't allow this state to be user-visible by always funneling allocations through Procedure. 2) Owned by a Procedure but not in any BasicBlock. This is not a memory leak since Procedure will delete all values. This state will fail validation because we require all values to be in basic blocks. If you know that you're in this state, Procedure has a GC method you can call. Currently, the FTL calls this method right after lowering. I don't think that method has any other users. 3) Owned by a Procedure and in one BasicBlock. This is expected state of all values in between phases (i.e. when we validate). 1184575 10 benjamin 2016-04-17 22:12:57 -0700 Committed r199648: <http://trac.webkit.org/changeset/199648> 276440 2016-04-14 15:27:48 -0700 2016-04-14 15:31:16 -0700 Patch bug-156603-20160414152801.patch text/plain 48834 benjamin U3VidmVyc2lvbiBSZXZpc2lvbjogMTk5NTI5CmRpZmYgLS1naXQgYS9Tb3VyY2UvSmF2YVNjcmlw dENvcmUvQ2hhbmdlTG9nIGIvU291cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwppbmRleCBi YTMwYzdhMjBlMTNjZmNjMzQ3MDU5ZDc2YWM5MDM1OWZiY2JhMmQ0Li4xZTJlNjAxMDVjZWFmODE3 NzlmYjhiNGJlZTE1YjUyZDVkOTBiZTgyIDEwMDY0NAotLS0gYS9Tb3VyY2UvSmF2YVNjcmlwdENv cmUvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKQEAgLTEs MyArMSw4MiBAQAorMjAxNi0wNC0xNCAgQmVuamFtaW4gUG91bGFpbiAgPGJwb3VsYWluQGFwcGxl LmNvbT4KKworICAgICAgICBbSlNDXSBSZWR1Y2VEb3VibGVUb0Zsb2F0IHNob3VsZCB3b3JrIGFj Y3Jvc3MgUGhpcworICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/ 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