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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/invoke.texi | |
| parent | 9cc6b3f86acd4911d6cbd6f57cb3148c52e89d38 (diff) | |
| download | gcc-1c122092dcf48801c638abdf070f18c6fe025ad6.tar.gz | |
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/invoke.texi')
| -rw-r--r-- | gcc/fortran/invoke.texi | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/gcc/fortran/invoke.texi b/gcc/fortran/invoke.texi index e8b8409319e..c0be1abf21f 100644 --- a/gcc/fortran/invoke.texi +++ b/gcc/fortran/invoke.texi @@ -764,7 +764,8 @@ This currently includes @option{-Waliasing}, @option{-Wampersand}, @option{-Wconversion}, @option{-Wsurprising}, @option{-Wc-binding-type}, @option{-Wintrinsics-std}, @option{-Wtabs}, @option{-Wintrinsic-shadow}, @option{-Wline-truncation}, @option{-Wtarget-lifetime}, -@option{-Winteger-division}, @option{-Wreal-q-constant} and @option{-Wunused}. +@option{-Winteger-division}, @option{-Wreal-q-constant}, @option{-Wunused} +and @option{-Wundefined-do-loop}. @item -Waliasing @opindex @code{Waliasing} @@ -924,6 +925,12 @@ a warning to be issued if a tab is encountered. Note, @option{-Wtabs} is active for @option{-pedantic}, @option{-std=f95}, @option{-std=f2003}, @option{-std=f2008}, @option{-std=f2008ts} and @option{-Wall}. +@item -Wundefined-do-loop +@opindex @code{Wundefined-do-loop} +@cindex warnings, undefined do loop +Warn if a DO loop with step either 1 or -1 yields an underflow or an overflow +during iteration of an induction variable of the loop. Enabled by default. + @item -Wunderflow @opindex @code{Wunderflow} @cindex warnings, underflow |