[Webkit-unassigned] [Bug 26334] New: WTF::FloatHash is invalid for 0 / -0
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Thu Jun 11 15:39:30 PDT 2009
https://bugs.webkit.org/show_bug.cgi?id=26334
Summary: WTF::FloatHash is invalid for 0 / -0
Product: WebKit
Version: 528+ (Nightly build)
Platform: Macintosh
OS/Version: Mac OS X 10.5
Status: NEW
Severity: Normal
Priority: P2
Component: JavaScriptCore
AssignedTo: webkit-unassigned at lists.webkit.org
ReportedBy: ggaren at apple.com
Because FloatHash does a bitwise hash, 0 and -0 get different hash values, even
though they compare equal. That's a hash table no-no.
More info here: http://virtualdub.org/blog/pivot/entry.php?id=259.
Simplest solution is to mask the sign bit when computing a FloatHash. Another
option is to treat -0 as a special case, and return the hash value for 0.
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