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[Bug tree-optimization/27140] Compiling LLVM now takes nearly 5x as long with 4.1 as it did with 4.0
- From: "dberlin at dberlin dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 13 Apr 2006 22:40:28 -0000
- Subject: [Bug tree-optimization/27140] Compiling LLVM now takes nearly 5x as long with 4.1 as it did with 4.0
- References: <bug-27140-10546@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #7 from dberlin at gcc dot gnu dot org 2006-04-13 22:40 -------
Subject: Re: Compiling LLVM now takes nearly 5x as long with 4.1 as it did
with 4.0
On Apr 13, 2006, at 1:30 PM, rspencer at x10sys dot com wrote:
>
>
> ------- Comment #6 from rspencer at x10sys dot com 2006-04-13
> 20:30 -------
> Created an attachment (id=11261)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=11261&action=view)
> --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=11261&action=view)
> Timing results with -fno-tree-salias
>
> Andrew Pinskia suggested that I try -fno-tree-salias. This decreased
> compilation time by about 10% (244 secs vs 265 secs).
Only by virtue of the fact that you have a smaller number of phi nodes.
It's not going to give an order of magnitude improvement here.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27140