profiledbootstrap insn-attrtab.c compile taking forever

profiledbootstrap insn-attrtab.c compile taking forever

[Richard Guenther]

As subject says - on x86_64 it takes a whopping 30 minutes to
compile said with -fprofile-generate!  And of course profiledbootstrap
later fails with

stage1/xgcc -Bstage1/ -B/usr/local/x86_64-unknown-linux-gnu/bin/ -c   -g 
-O2 -fprofile-use -freorder-blocks-and-partition -DIN_GCC   -W -Wall 
-Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -pedantic 
-Wno-long-long -Wno-variadic-macros -Wold-style-definition -Werror 
-fno-common   -DHAVE_CONFIG_H    -I. -I. 
-I/mnt/space/rguenther/src/gcc-clean/gcc 
-I/mnt/space/rguenther/src/gcc-clean/gcc/. 
-I/mnt/space/rguenther/src/gcc-clean/gcc/../include 
-I/mnt/space/rguenther/src/gcc-clean/gcc/../libcpp/include  
/mnt/space/rguenther/src/gcc-clean/gcc/tree-cfg.c -o tree-cfg.o
/mnt/space/rguenther/src/gcc-clean/gcc/tree-cfg.c: In function 
‘tree_find_edge_insert_loc’:
/mnt/space/rguenther/src/gcc-clean/gcc/tree-cfg.c:2915: error: coverage 
mismatch for function ‘tree_find_edge_insert_loc’ while reading 
counter ‘arcs’
/mnt/space/rguenther/src/gcc-clean/gcc/tree-cfg.c:2915: error: number of 
counters is 39 instead of 41

Richard.

Re: profiledbootstrap insn-attrtab.c compile taking forever

[Richard Guenther]

On 7/14/05, Richard Guenther <rguenther@suse.de> wrote:
> 
> As subject says - on x86_64 it takes a whopping 30 minutes to
> compile said with -fprofile-generate!

It's caused by -frename-registers enabled by -funroll-loops.  Compiling
with -O2 -fno-unroll-loops -fprofile-generate compared to -O2 -fno-unroll-loops
-fprofile-generate -frename-registers takes 14 minutes instead of 31.

Please consider not enabling -frename-registers for -fprofile-generate.

Thanks,
Richard.

Re: profiledbootstrap insn-attrtab.c compile taking forever

[R Hill]

Richard Guenther wrote:
> On 7/14/05, Richard Guenther <rguenther@suse.de> wrote:
>> As subject says - on x86_64 it takes a whopping 30 minutes to
>> compile said with -fprofile-generate!
> 
> It's caused by -frename-registers enabled by -funroll-loops.  Compiling
> with -O2 -fno-unroll-loops -fprofile-generate compared to -O2 -fno-unroll-loops
> -fprofile-generate -frename-registers takes 14 minutes instead of 31.
> 
> Please consider not enabling -frename-registers for -fprofile-generate.

I thought -frename-registers defaulted to disabled now.  On the 4.0 
branch the manual states it's not enabled by opt switches due to known 
bugs.  Is it also enabled by -funroll-loops on the branch?

--de.

Re: profiledbootstrap insn-attrtab.c compile taking forever

[R Hill]

R Hill wrote:
> Richard Guenther wrote:
>> On 7/14/05, Richard Guenther <rguenther@suse.de> wrote:
>>> As subject says - on x86_64 it takes a whopping 30 minutes to
>>> compile said with -fprofile-generate!
>>
>> It's caused by -frename-registers enabled by -funroll-loops.  Compiling
>> with -O2 -fno-unroll-loops -fprofile-generate compared to -O2 
>> -fno-unroll-loops
>> -fprofile-generate -frename-registers takes 14 minutes instead of 31.
>>
>> Please consider not enabling -frename-registers for -fprofile-generate.
> 
> I thought -frename-registers defaulted to disabled now.  On the 4.0 
> branch the manual states it's not enabled by opt switches due to known 
> bugs.  Is it also enabled by -funroll-loops on the branch?

Nevermind, I've just found the relevant discussion. ;P

--de.