This is the mail archive of the mailing list for the binutils project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: Performance bug while ordering .text sections by default in gold.

On Tue, Jan 22, 2013 at 11:35 AM, Sriraman Tallam <> wrote:
>    This patch to gold :
> introduces
> unnecessary behaviour while ordering text sections and this is causing
> performance regressions in some benchmarks.  The intent of this patch
> was to group .text sections with special prefixes like "",
> ".text.unlikely" , ".text.startup" together, which it achieves.
> However, it does other undesired things too like sorting section names
> of those sections without these special prefixes.  This is because it
> uses the compare function "Input_section_sort_compare" which was used
> to sort ".ctors" and ".dtors". Sorting by section names can cause
> undesired ordering like splitting functions in the same module.
>    I am fixing this by making ".text" default sorting use the sort
> function Input_section_sort_section_order_index_compare.  I think this
> is better as the different comparison criteria are much less and is
> all applicable to ".text" under different contexts.

Why reuse Input_section_sort_section_order_index_compare?

It seems to me that you've identified a need for a new kind of
ordering.  Use a new function for that.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]