167736 2017-02-02 09:05:20 -0800 [JSC] Add operationToInt32SensibleSlow to optimize kraken pbkdf2 and sha256 2017-02-04 13:22:35 -0800 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 ysuzuki ysuzuki benjamin commit-queue fpizlo joepeck keith_miller mark.lam msaboff saam webkit-bug-importer oldest_to_newest 1272478 0 ysuzuki 2017-02-02 09:05:20 -0800 [JSC] Add operationToInt32Fallback to optimize kraken pbkdf2 1272481 1 300414 ysuzuki 2017-02-02 09:13:11 -0800 Created attachment 300414 Patch WIP 1272482 2 ysuzuki 2017-02-02 09:13:44 -0800 Still considering about the edge cases. 1272484 3 ysuzuki 2017-02-02 09:15:52 -0800 CAUTION: Currently, this is only valid in x64 (sensible double to int32 case in DFG and FTL). And still I'm now considering about edge cases. BTW, the latest ARM64 has super fast double to int32 operation. If this instruction becomes available, we can optimize this in ARM64. 1272490 4 ysuzuki 2017-02-02 09:34:39 -0800 Pf course, later, we should make DFG prediction better not to emit ValueToInt32 in such a case. But I think optimizing this sensitive double to int32 is worth doing. Note that kraken pbkdf2 consumes 1/3 time for operationToInt32. ;) 1272504 5 ysuzuki 2017-02-02 10:13:08 -0800 This also improves kraken sha256 iterative. 1272547 6 300414 ysuzuki 2017-02-02 11:17:13 -0800 Comment on attachment 300414 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=300414&action=review > Source/JavaScriptCore/runtime/MathCommon.cpp:481 > + // If exponent < 0 there will be no bits to the left of the decimal point > + // after rounding; if the exponent is > 83 then no bits of precision can be > + // left in the low 32-bit range of the result (IEEE-754 doubles have 52 bits > + // of fractional precision). > + // Note this case handles 0, -0, and all infinite, NaN, & denormal value. > + if (exp < 0 || exp > 83) > + return 0; And I think this check is also unnecessary. 1. If exp < 0, truncate should succeed. 2. If exp > 83 (exp >= 84), the following code produces 0 as a result. (exp > 52, so static_cast<int32_t>(bits << (84 - 52)) -> 0) 1272879 7 300518 ysuzuki 2017-02-03 05:09:23 -0800 Created attachment 300518 Patch 1273209 8 300518 saam 2017-02-04 01:12:49 -0800 Comment on attachment 300518 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=300518&action=review r=me > Source/JavaScriptCore/ChangeLog:63 > + 1ff: 66 48 0f 7e c0 movq %xmm0,%rax I wonder why this doesn't do a mov rdx, rax > Source/JavaScriptCore/runtime/MathCommon.cpp:470 > +int32_t JIT_OPERATION operationToInt32SensibleSlow(double number) IEE754 is fun 1273235 9 300518 ysuzuki 2017-02-04 05:46:14 -0800 Comment on attachment 300518 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=300518&action=review >> Source/JavaScriptCore/ChangeLog:63 >> + 1ff: 66 48 0f 7e c0 movq %xmm0,%rax > > I wonder why this doesn't do a mov rdx, rax Yeah, that's storage. But it's due to the GCC6's decision. >> Source/JavaScriptCore/runtime/MathCommon.cpp:470 >> +int32_t JIT_OPERATION operationToInt32SensibleSlow(double number) > > IEE754 is fun Yeah :) 1273236 10 ysuzuki 2017-02-04 05:47:51 -0800 Committed r211670: <http://trac.webkit.org/changeset/211670> 1273281 11 saam 2017-02-04 13:16:37 -0800 I've confirmed that this is a 1-1.5% progression on Mac Kraken. 1273282 12 webkit-bug-importer 2017-02-04 13:22:35 -0800 <rdar://problem/30364482> 300414 2017-02-02 09:13:11 -0800 2017-02-03 05:09:19 -0800 Patch bug-167736-20170203021055.patch text/plain 10951 ysuzuki U3VidmVyc2lvbiBSZXZpc2lvbjogMjExNTU4CmRpZmYgLS1naXQgYS9Tb3VyY2UvSmF2YVNjcmlw dENvcmUvQ2hhbmdlTG9nIGIvU291cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwppbmRleCBi OWUwZDlmMzkwNjZkYjJkYjlkYjJhMDgyOTgzY2UwODdiYTUyYjMzLi5mNWQxYWQxNjc5OTI0NjZk YTg3NmYwOWE2MmNmYzk5Y2E3YjFhOTQ2IDEwMDY0NAotLS0gYS9Tb3VyY2UvSmF2YVNjcmlwdENv cmUvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKQEAgLTEs 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