diff options
Diffstat (limited to 'gcc/fortran/invoke.texi')
| -rw-r--r-- | gcc/fortran/invoke.texi | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/gcc/fortran/invoke.texi b/gcc/fortran/invoke.texi index 093864b..ee84a0b 100644 --- a/gcc/fortran/invoke.texi +++ b/gcc/fortran/invoke.texi @@ -1793,13 +1793,17 @@ if @option{-ffrontend-optimize} is in effect. @opindex @code{frontend-optimize} @cindex Front-end optimization This option performs front-end optimization, based on manipulating -parts the Fortran parse tree. Enabled by default by any @option{-O} -option. Optimizations enabled by this option include inlining calls -to @code{MATMUL}, elimination of identical function calls within -expressions, removing unnecessary calls to @code{TRIM} in comparisons -and assignments and replacing @code{TRIM(a)} with -@code{a(1:LEN_TRIM(a))}. It can be deselected by specifying -@option{-fno-frontend-optimize}. +parts the Fortran parse tree. Enabled by default by any @option{-O} option +except @option{-O0} and @option{-Og}. Optimizations enabled by this option +include: +@itemize @bullet +@item inlining calls to @code{MATMUL}, +@item elimination of identical function calls within expressions, +@item removing unnecessary calls to @code{TRIM} in comparisons and assignments, +@item replacing @code{TRIM(a)} with @code{a(1:LEN_TRIM(a))} and +@item short-circuiting of logical operators (@code{.AND.} and @code{.OR.}). +@end itemize +It can be deselected by specifying @option{-fno-frontend-optimize}. @item -ffrontend-loop-interchange @opindex @code{frontend-loop-interchange} |