Closed Bug 538729 Opened 13 years ago Closed 12 years ago

Consider backporting the byte-specialized canvas imagedata to 1.9.2.x

Categories

(Core :: JavaScript Engine, defect)

x86
macOS
defect
Not set
normal

Tracking

()

RESOLVED WONTFIX

People

(Reporter: bzbarsky, Unassigned)

References

Details

The work is pretty self-contained: custom quickstubs, typedarrays, and canvas 2d bits.  The impact is much faster canvas imagedata ops; speedups are 30% to 50% depending on testcase we've looked at, probably mostly from the better cache locality that we get with the 4x smaller imagedata.

This moves the needle from being at about safari-parity on most of these testcases (they've been slowly creeping faster in their dot-releases) to a lot faster.
Added the relevant dependent bugs; we wouldn't need all of them, just fixes/changes to qsgen.py, and then the new code for typed arrays + the canvas 2d quickstubs.  We'd want to make sure that we don't expose the typed array constructors to web content, but that shouldn't be too hard.
Depends on: 550309
Do we still want to do this?
There's no point; this would have helped to avoid being branded as slow 18 months ago, but now it's not like anyone cares the performance of 3.6.
Status: NEW → RESOLVED
Closed: 12 years ago
Resolution: --- → WONTFIX
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