88314 2012-06-05 01:38:37 -0700 Improve Math.round and Math.floor intrinsic 2022-02-27 23:24:11 -0800 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 yuqiang.xian webkit-unassigned barraclough fpizlo oldest_to_newest 641310 0 yuqiang.xian 2012-06-05 01:38:37 -0700 Currently we call a native function from the JIT code to complete the "round" and "floor" operations. We could inline some fast paths especially for those positive values on the platforms where floating point truncation is supported. 641319 1 145729 yuqiang.xian 2012-06-05 01:52:18 -0700 Created attachment 145729 patch 641322 2 145730 yuqiang.xian 2012-06-05 01:55:00 -0700 Created attachment 145730 Performance result ~3% improvement on Kraken (32% on audio-oscillator), and nearly 1% on SunSpider. 641329 3 yuqiang.xian 2012-06-05 01:58:30 -0700 (In reply to comment #2) > Created an attachment (id=145730) [details] > Performance result > > ~3% improvement on Kraken (32% on audio-oscillator), and nearly 1% on SunSpider. o... for clarification, overall SS improvement is not obvious, but definitely 9% on one case. 642128 4 145729 fpizlo 2012-06-05 20:47:07 -0700 Comment on attachment 145729 patch View in context: https://bugs.webkit.org/attachment.cgi?id=145729&action=review This looks right. I'm curious what your thoughts are about the comparing against neg zero. Maybe this code would work the same if you just used zero instead of neg zero, which would be faster, since regular zero is easier to load in SSE? Not marking cq+ just because I want to give you an opportunity to respond. But I think the code is correct so if there's nothing that needs changing then I'm fine with this being landed as-is. > Source/JavaScriptCore/jit/ThunkGenerators.cpp:197 > + doubleResult.append(jit.branchDouble(MacroAssembler::DoubleEqual, SpecializedThunkJIT::fpRegT0, SpecializedThunkJIT::fpRegT1)); Is this right? Double equality has strange handling of zero. 0 == -0 for example. 642141 5 yuqiang.xian 2012-06-05 21:02:17 -0700 (In reply to comment #4) > (From update of attachment 145729 [details]) > View in context: https://bugs.webkit.org/attachment.cgi?id=145729&action=review > > This looks right. I'm curious what your thoughts are about the comparing against neg zero. Maybe this code would work the same if you just used zero instead of neg zero, which would be faster, since regular zero is easier to load in SSE? > > Not marking cq+ just because I want to give you an opportunity to respond. But I think the code is correct so if there's nothing that needs changing then I'm fine with this being landed as-is. > > > Source/JavaScriptCore/jit/ThunkGenerators.cpp:197 > > + doubleResult.append(jit.branchDouble(MacroAssembler::DoubleEqual, SpecializedThunkJIT::fpRegT0, SpecializedThunkJIT::fpRegT1)); > > Is this right? Double equality has strange handling of zero. 0 == -0 for example. You're right. It should be 0. 642179 6 yuqiang.xian 2012-06-05 22:28:24 -0700 Landed with Filip's comments addressed: http://trac.webkit.org/changeset/119558 145729 2012-06-05 01:52:18 -0700 2022-02-27 23:24:11 -0800 patch 88314.patch text/plain 5304 yuqiang.xian SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMTE5NDY4KQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDIyIEBA CisyMDEyLTA2LTA1ICBZdXFpYW5nIFhpYW4gIDx5dXFpYW5nLnhpYW5AaW50ZWwuY29tPgorCisg ICAgICAgIEltcHJvdmUgTWF0aC5yb3VuZCBhbmQgTWF0aC5mbG9vciBpbnRyaW5zaWMKKyAgICAg ICAgaHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTg4MzE0CisKKyAgICAg ICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisKKyAgICAgICAgQ3VycmVudGx5IHdlIGNh bGwgYSBuYXRpdmUgZnVuY3Rpb24gZnJvbSB0aGUgSklUIGNvZGUgdG8gY29tcGxldGUgdGhlCisg 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