search

keeleysam / tenfourfox

Automatically exported from code.google.com/p/tenfourfox
0 stars 0 forks source link

Use r2 for trampoline code to take functional unit pressure off r0 #151

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
GPR2 isn't used on Darwin as TOC pointer so it can be used locally without 
problems, like in any code compiled by gcc for Darwin. See also: 
https://developer.apple.com/library/mac/documentation/developertools/Conceptual/
LowLevelABI/100-32-bit_PowerPC_Function_Calling_Conventions/32bitPowerPC.html#//
apple_ref/doc/uid/TP40002438-SW18 .

Original issue reported on code.google.com by Tobias.N...@gmail.com on 17 May 2012 at 8:59

GoogleCodeExporter commented 9 years ago 
I talked to Dave Mandelin about register usage way back in the early days of 
the JM port and actually we already have far more registers in play than 
methodjit will ever use. It might be something to consider for ion though.

Original comment by classi...@floodgap.com on 17 May 2012 at 1:17

GoogleCodeExporter commented 9 years ago 
And what about using r2 instead of r11 as r11 shouldn't normally be used?

Original comment by Tobias.N...@gmail.com on 17 May 2012 at 1:23

GoogleCodeExporter commented 9 years ago 
It's a thought, though so far there have been no problems in practice, so I'm 
unwilling to change it now without a good reason (but again, we have to start 
from scratch in ion, so).

Original comment by classi...@floodgap.com on 17 May 2012 at 1:26

GoogleCodeExporter commented 9 years ago 
We're going to use r2 after all, but for the "trampoline remnant" (see 
discussion in issue 167).

Original comment by classi...@floodgap.com on 18 Jul 2012 at 4:10

GoogleCodeExporter commented 9 years ago 
I attempted to work on this, and the JS works, but there is absolutely no 
difference at least on the G5. This could be because of the G5's 
superscalarity, but I am thinking this doesn't really pay off.

Original comment by classi...@floodgap.com on 18 Sep 2012 at 9:12

GoogleCodeExporter commented 9 years ago 
We're going to look at this for IonMonkey, but I don't think there's much 
payoff here after all.

Original comment by classi...@floodgap.com on 21 Dec 2012 at 4:45