diff options
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/invoke.texi | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index c8f5b35..6dac207 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -4419,7 +4419,7 @@ the performance and/or code size at the expense of compilation time and possibly the ability to debug the program. The compiler performs optimization based on the knowledge it has of -the program. Optimization levels @option{-O2} and above, in +the program. Optimization levels @option{-O} and above, in particular, enable @emph{unit-at-a-time} mode, which allows the compiler to consider information gained from later functions in the file when compiling a function. Compiling multiple files at @@ -4459,6 +4459,7 @@ compilation time. -ftree-copyrename @gol -ftree-fre @gol -ftree-ch @gol +-funit-at-a-time @gol -fmerge-constants} @option{-O} also turns on @option{-fomit-frame-pointer} on machines @@ -4489,7 +4490,6 @@ also turns on the following optimization flags: -fstrict-aliasing @gol -fdelete-null-pointer-checks @gol -freorder-blocks -freorder-functions @gol --funit-at-a-time @gol -falign-functions -falign-jumps @gol -falign-loops -falign-labels @gol -ftree-vrp @gol @@ -5422,7 +5422,7 @@ attribute @code{used} will prevent this behavior. As a temporary workaround, @option{-fno-unit-at-a-time} can be used, but this scheme may not be supported by future releases of GCC@. -Enabled at levels @option{-O2}, @option{-O3}. +Enabled at levels @option{-O}, @option{-O2}, @option{-O3}, @option{-Os}. @item -fno-toplevel-reorder Do not reorder top-level functions, variables, and @code{asm} |