Closed
Bug 581291
Opened 14 years ago
Closed 14 years ago
JM: PIC JSOP_NAME lookups that resolve to the global object
Categories
(Core :: JavaScript Engine, defect)
Tracking
()
RESOLVED
FIXED
People
(Reporter: dvander, Unassigned)
References
Details
Right now a NAME opcode will create a PIC only for call objects. If the holder is the global object, the PIC is disabled. We can do better.
This will probably be a very small win for SS, but bigger for the web in general.
See related bug 489098.
Reporter | ||
Comment 1•14 years ago
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> function f() {
> eval("for (i = 0; i < 1000000; i++) { }");
> }
> var d = new Date();
> f();
> print(Date.now() - d);
Interesting.
dvander@dvander:~/mozilla/moo/js/src$ ./Opt32/js -m k.js
12
dvander@dvander:~/mozilla/moo/js/src$ ~/projects/v8/shell k.js
138
dvander@dvander:~/mozilla/moo/js/src$ ./Opt32/js -j k.js
2
Anyway, this is about a 1-2ms win on date-format-xparb, removing about 50,000 stub calls.
http://hg.mozilla.org/users/danderson_mozilla.com/moo/rev/05e714a501e9
Status: NEW → RESOLVED
Closed: 14 years ago
Resolution: --- → FIXED
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Description
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