[SFN+LVU+IEPM v4 9/9] [IEPM] Introduce inline entry point markers

[Szabolcs Nagy]

On 21/02/18 10:11, Alexandre Oliva wrote:
> On Feb 15, 2018, Szabolcs Nagy <szabolcs.nagy@arm.com> wrote:
> 
>> i see assembler slow downs with these location view patches
>> i opened https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84408
> 
> 
> [LVU] reset view at function entry, omit views at line zero
> 
> Location views might be associated with locations that lack line
> number information (line number zero), but since we omit .loc
> directives that would have been issued with line number zero, we also
> omit the symbolic view numbers that would have been issued at such
> points.
> 
> Resetting views at function entry points address some of these issues,
> and alleviate the huge chains of symbolic views that have burdened
> assemblers since we disabled -ginternal-reset-location-views by
> default, but other problems of undefined views remain when it's not
> the whole function that lacks line number info, just parts of it.
> 
> So, when we encounter a request to output a view that may have been
> referenced, but we decide to omit the .loc because the line is zero,
> we will now omit the view as well, i.e., we will internally regard
> that view as zero-numbered.
> 
> Regstrapped on x86_64-linux-gnu and i686-linux-gnu.  Ok to install?
> 

fixes 84408 for me, now i get

$ ./xg++ -B. -g -O -fPIC -shared -fno-rtti -time poly-int-07_plugin.ii
# cc1plus 47.39 0.60
# as 6.78 0.25
# collect2 0.27 0.04