579225 - JM: fast paths for comparing doubles

Status: RESOLVED FIXED

(Core :: JavaScript Engine, defect)

Description

[David Mandelin [:dmandelin]]

We need fast paths for doubles for JSOP_(GE|GT|LE|LT). There are about 600K such ops in SunSpider. This might also give us 3 ms or so on V8, but that's hard to even see in such big total times.

JM wanted SS win: 10 ms

Comment 1

[Sean Stangl [:sstangl]]

I also measured this to be a big win in JSNES.

Double fast-paths for comparison will look like a simpler version of jsop_binary(), which is still unideal. It may be worth leaving this until later to see whether anything happens with FrameState changes -- if not, we can implement this the hard way.

Comment 2

[David Anderson [:dvander] - inactive, e-mail if emergency]

http://hg.mozilla.org/users/danderson_mozilla.com/moo/rev/519ef7509207

About 16ms win on my Desktop, less on the graphs (mac-mini dampened to 8ms).