diff options
Diffstat (limited to 'gcc/doc/invoke.texi')
| -rw-r--r-- | gcc/doc/invoke.texi | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 36c37e0..9942755 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -385,7 +385,7 @@ Objective-C and Objective-C++ Dialects}. -fprofile-correction -fprofile-dir=@var{path} -fprofile-generate @gol -fprofile-generate=@var{path} @gol -fprofile-use -fprofile-use=@var{path} -fprofile-values @gol --freciprocal-math -fregmove -frename-registers -freorder-blocks @gol +-freciprocal-math -free -fregmove -frename-registers -freorder-blocks @gol -freorder-blocks-and-partition -freorder-functions @gol -frerun-cse-after-loop -freschedule-modulo-scheduled-loops @gol -frounding-math -fsched2-use-superblocks -fsched-pressure @gol @@ -6709,6 +6709,14 @@ Perform a number of minor optimizations that are relatively expensive. Enabled at levels @option{-O2}, @option{-O3}, @option{-Os}. +@item -free +@opindex free +Attempt to remove redundant extension instructions. This is especially +helpful for the x86-64 architecture which implicitly zero-extends in 64-bit +registers after writing to their lower 32-bit half. + +Enabled for x86 at levels @option{-O2}, @option{-O3}. + @item -foptimize-register-move @itemx -fregmove @opindex foptimize-register-move |