https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84487
Tomáš Trnka <trnka at scm dot com> changed:
What |Removed |Added
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CC| |trnka at scm dot com
--- Comment #12 from Tomáš Trnka <trnka at scm dot com> ---
(In reply to Wilco from comment #11)
> I'm not sure it's the same problem but the huge size increases I noticed are
> due to not optimizing zeroes from initializers, so we end up with huge
> rodata with only zeroes in it.
It indeed is the same problem. The change in r254427 causes def_init to be
generated for all types in a module (even if there's nothing to initialize), so
any type with a large array in it will end up taking lots of space in rodata.
Example:
module FooModule
type Foo
integer :: array(1000000)
end type
end module
program def_init_size
use FooModule
type(Foo) :: x
x%array(1) = 1
write(*,*) x%array(1)
end program
VM SIZE FILE SIZE
-------------- --------------
50.0% 3.81Mi .rodata 3.81Mi 99.6%
100.0% 3.81Mi __foomodule_MOD___def_init_foomodule_Foo 3.81Mi 100.0%
0.0% 60 [section .rodata] 60 0.0%
0.0% 48 __foomodule_MOD___vtab_foomodule_Foo 48 0.0%
0.0% 28 options.1.3571 28 0.0%
0.0% 4 _IO_stdin_used 4 0.0%
50.0% 3.81Mi .bss 0 0.0%
100.0% 3.81Mi x.3565 0 NAN%
0.0% 31 [section .bss] 0 NAN%
0.0% 1 completed.7132 0 NAN%
