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[Bug fortran/48543] New: Collapse identical strings
- From: "tkoenig at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Sun, 10 Apr 2011 18:30:59 +0000
- Subject: [Bug fortran/48543] New: Collapse identical strings
- Auto-submitted: auto-generated
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48543
Summary: Collapse identical strings
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: enhancement
Priority: P3
Component: fortran
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: tkoenig@gcc.gnu.org
The two programs yield identical results. The second program
results in a shorter object file because the
ig25@linux-fd1f:~/Krempel/String> cat foo.f90
program main
character(len=17) :: a
character(len=34) :: b
a = 'Supercalifragilis'
b = 'Supercalifragilisticexpialidocious'
print *,a," ",b
end program main
ig25@linux-fd1f:~/Krempel/String> cat bar.f90
program main
character(len=17) :: a
character(len=34) :: b
a = 'Supercalifragilisticexpialidocious'
b = 'Supercalifragilisticexpialidocious'
print *,a," ",b
end program main
ig25@linux-fd1f:~/Krempel/String> gfortran -c -Os foo.f90
ig25@linux-fd1f:~/Krempel/String> gfortran -c -Os bar.f90
ig25@linux-fd1f:~/Krempel/String> ls -l foo.f90 bar.f90
-rw-r--r-- 1 ig25 users 184 10. Apr 19:02 bar.f90
-rw-r--r-- 1 ig25 users 167 10. Apr 19:01 foo.f90
g25@linux-fd1f:~/Krempel/String> strings foo.o | grep Super
SupercalifragilisSupercalifragilisticexpialidocious
ig25@linux-fd1f:~/Krempel/String> strings bar.o | grep Super
Supercalifragilisticexpialidocious
This is an optimization that could be done for -Os, at least.