https://bugs.webkit.org/show_bug.cgi?id=167797
Bug ID: 167797
Summary: Line-heavy SVG example spends a lot of time in
SVGPointListValues::valueAsString()
Classification: Unclassified
Product: WebKit
Version: WebKit Nightly Build
Hardware: Unspecified
OS: Unspecified
Status: NEW
Severity: Normal
Priority: P2
Component: SVG
Assignee: webkit-unassigned at lists.webkit.org
Reporter: simon.fraser at apple.com
CC: zimmermann at kde.org
Load https://bl.ocks.org/monfera/fb2ba8d3b6c3fbeb5f1f54b7dc4d58ea and sample.
Lots of time under:
2100 vmEntryToJavaScript (in JavaScriptCore) + 299 [0x1106c4ceb]
2093 ??? (in <unknown binary>) [0x2026beba1496]
| 2092 WebCore::setJSSVGPointX(JSC::ExecState*, long long, long long) (in WebCore) + 380 [0x1125e194c]
| + 2077 WebCore::SVGAttributeToPropertyMap::synchronizeProperty(WebCore::SVGElement&, WebCore::QualifiedName const&) const (in WebCore) + 121 [0x112aee7b9]
| + ! 1943 WebCore::SVGPolyElement::synchronizePoints(WebCore::SVGElement*) (in WebCore) + 136 [0x112b4d3e8]
| + ! : 952 WebCore::SVGPointListValues::valueAsString() const (in WebCore) + 350 [0x112b4d2be]
| + ! : | 812 WTF::StringBuilder::appendNumber(double, unsigned int, WTF::TrailingZerosTruncatingPolicy) (in JavaScriptCore) + 53 [0x1108defe5]
| + ! : | + 725 WTF::numberToFixedPrecisionString(double, unsigned int, char*, bool) (in JavaScriptCore) + 70 [0x10fed06e6]
| + ! : | + ! 476 WTF::double_conversion::DoubleToStringConverter::ToPrecision(double, int, WTF::double_conversion::StringBuilder*) const (in JavaScriptCore) + 290 [0x10fed08a2]
Ironically examples like this are cited as being slow because they don't use hardware acceleration, but in this case most of the time is in number-to-string code. Why so much?
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