Is -falign-loops=16 ignored sometimes?
Is -falign-loops=16 ignored sometimes?
- Subject: Is -falign-loops=16 ignored sometimes?
- From: Rich Siegel <email@hidden>
- Date: Mon, 16 Apr 2007 10:58:43 -0400
[Grr, sorry about the empty message. Not enough caffeine.]
This may end up being a question for the performance list, but
since it appears to involve a compiler behavior, I thought I'd
ask here first.
On i386, are there known circumstances in which -falign-loops=16
is ignored? The reason I ask is because a particular hotspot
function of mine is taking a big hit for an unaligned loop
(according to Shark), even though the file is compiled with
-falign-loops=16 (I double-checked the build transcript to
verify this).
Or is 16-byte loop alignment inappropriate for i386 and I should
use a 32-byte alignment? And what are the implications of this
for PPC code?
Thanks for any advice,
R.
--
Rich Siegel Bare Bones Software, Inc.
<email@hidden> <http://www.barebones.com/>
Someday I'll look back on all this and laugh... until they
sedate me.
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Xcode-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden