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| author | Martin Liska <mliska@suse.cz> | 2016-07-07 15:15:39 +0200 |
|---|---|---|
| committer | Martin Liska <marxin@gcc.gnu.org> | 2016-07-07 13:15:39 +0000 |
| commit | 1c122092dcf48801c638abdf070f18c6fe025ad6 (patch) | |
| tree | 22f4b1f8abca321823c347e6673350df6ccef09d /gcc/fortran/lang.opt | |
| parent | 9cc6b3f86acd4911d6cbd6f57cb3148c52e89d38 (diff) | |
| download | gcc-1c122092dcf48801c638abdf070f18c6fe025ad6.zip gcc-1c122092dcf48801c638abdf070f18c6fe025ad6.tar.gz gcc-1c122092dcf48801c638abdf070f18c6fe025ad6.tar.bz2 | |
Optimize fortran loops with +-1 step.
* gfortran.dg/do_1.f90: Remove a corner case that triggers
an undefined behavior.
* gfortran.dg/do_3.F90: Likewise.
* gfortran.dg/do_check_11.f90: New test.
* gfortran.dg/do_check_12.f90: New test.
* gfortran.dg/do_corner_warn.f90: New test.
* lang.opt (Wundefined-do-loop): New option.
* resolve.c (gfc_resolve_iterator): Warn for Wundefined-do-loop.
(gfc_trans_simple_do): Generate a c-style loop.
(gfc_trans_do): Fix GNU coding style.
* invoke.texi: Mention the new warning.
From-SVN: r238114
Diffstat (limited to 'gcc/fortran/lang.opt')
| -rw-r--r-- | gcc/fortran/lang.opt | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/gcc/fortran/lang.opt b/gcc/fortran/lang.opt index bdf5fa5..8f8b299 100644 --- a/gcc/fortran/lang.opt +++ b/gcc/fortran/lang.opt @@ -309,6 +309,10 @@ Wtabs Fortran Warning Var(warn_tabs) LangEnabledBy(Fortran,Wall || Wpedantic) Permit nonconforming uses of the tab character. +Wundefined-do-loop +Fortran Warning Var(warn_undefined_do_loop) LangEnabledBy(Fortran,Wall) +Warn about an invalid DO loop. + Wunderflow Fortran Warning Var(warn_underflow) Init(1) Warn about underflow of numerical constant expressions. |