Profile-guided optimization

[GoogleCodeExporter]

We have gcc-4.0.1 on Tiger, so there's no good reason we can't have PGO in our 
builds except that we need to set up the infrastructure. I'd prefer this to be 
semiautomated to a baseline test suite, maybe optimized over my common sites as 
a starter. Things to look at:

https://developer.mozilla.org/en/building_with_profile-guided_optimization
https://bugzilla.mozilla.org/show_bug.cgi?id=513508
https://bugzilla.mozilla.org/show_bug.cgi?id=439087

Original issue reported on code.google.com by classi...@floodgap.com on 12 Nov 2010 at 2:06

• Blocked on: Switch to gcc 4.6.3 #52

[GoogleCodeExporter]

However, this implies that gcc 4.0.1 has compliance issues with PGO, so we 
should test very carefully. 

https://bugzilla.mozilla.org/show_bug.cgi?id=417045

For that matter,

https://bugzilla.mozilla.org/show_bug.cgi?id=419344

is not yet closed. Perhaps we will simply do it for JM/JS alone as well.

Original comment by classi...@floodgap.com on 12 Nov 2010 at 2:19

[GoogleCodeExporter]

dropping priority

Original comment by classi...@floodgap.com on 4 Mar 2011 at 2:08

• Added labels: Priority-Low
• Removed labels: Priority-High

[GoogleCodeExporter]

Original comment by classi...@floodgap.com on 3 Jun 2011 at 10:27

• Changed title: Profile-guided optimization

[classilla]

PGO doesn't work yet on ppc64le either, and doubles the build time. We can't afford this even if it did work.