Re: [PATCH][4/4][v2] RPO-style value-numbering for FRE/PRE

[Richard Biener <rguenther@suse.de>]

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On Wed, 5 Sep 2018, Gerald Pfeifer wrote:

> On Fri, 24 Aug 2018, Richard Biener wrote:
> > Comments are still welcome - I've re-bootstrapped and tested the series
> > on x86_64-unknown-linux-gnu for all languages and will talk about
> > this work at the Cauldron in more detail.
> 
> Is there any chance you can test this on i586 as well?

Sounds similar to PR87134?  I do see successful bootstraps on i?86-linux
on gcc-testresults though.

> Since around that commit (August 27th) my i586 builds are failing
> with something like
> 
>   during GIMPLE pass: pre
>   cp-demangle.c: In function Β‘d_print_compΒ’:
>   cp-demangle.c:5711:1: internal compiler error: Segmentation fault
>   5711 | d_print_comp (struct d_print_info *dpi, int options,
>        | ^~~~~~~~~~~~
> 
> when doing a regular bootstrap on i586-unknown-freebsd10.4 (with
> clang 3.4.1 as system compiler).
> 
> Alas, when I add -save-temps, the internal compiler error goes away,
> and the backtrace using gdb installed on that system I share isn't 
> very useful, either.  (When I replace cp-demangle.c by cp-demangle.i
> in the invocation the error also disppears.)
> 
> On the other hand, this ICE has been consistent across a week of
> daily builds now.

Any help with tracking this down appreciated ...

Richard.

> Gerald
> 
> /scratch/tmp/gerald/OBJ-0904-1640/./gcc/xgcc -B/scratch/tmp/gerald/OBJ-0904-1640/./gcc/ -B/home/gerald/gcc-ref10-i386/i586-unknown-freebsd10.4/bin/ 
> -B/home/gerald/gcc-ref10-i386/i586-unknown-freebsd10.4/lib/ -isystem 
> /home/gerald/gcc-ref10-i386/i586-unknown-freebsd10.4/include -isystem 
> /home/gerald/gcc-ref10-i386/i586-unknown-freebsd10.4/sys-include -fno-checking -DHAVE_CONFIG_H -I.. 
> -I/scratch/tmp/gerald/GCC-HEAD/libstdc++-v3/../libiberty 
> -I/scratch/tmp/gerald/GCC-HEAD/libstdc++-v3/../include -D_GLIBCXX_SHARED 
> -I/scratch/tmp/gerald/OBJ-0904-1640/i586-unknown-freebsd10.4/libstdc++-v3/include/i586-unknown-freebsd10.4 
> -I/scratch/tmp/gerald/OBJ-0904-1640/i586-unknown-freebsd10.4/libstdc++-v3/include 
> -I/scratch/tmp/gerald/GCC-HEAD/libstdc++-v3/libsupc++ -g -O2 -DIN_GLIBCPP_V3 -Wno-error 
> -c cp-demangle.c  -fPIC -DPIC -o cp-demangle.o

-- 
Richard Biener <rguenther@suse.de>
SUSE LINUX GmbH, GF: Felix Imendoerffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nuernberg)