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author | Eric Botcazou <ebotcazou@adacore.com> | 2006-05-26 20:04:14 +0000 |
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committer | Eric Botcazou <ebotcazou@gcc.gnu.org> | 2006-05-26 20:04:14 +0000 |
commit | 079c35fabd59f10bb202a03f45e008bed314feab (patch) | |
tree | 0a7133d27bb78c952fe5caa091a7d4b1c884913a /gcc/doc | |
parent | cd881e6944d05fef5e5d3c2022ef5bdcc2b50d00 (diff) | |
download | gcc-079c35fabd59f10bb202a03f45e008bed314feab.zip gcc-079c35fabd59f10bb202a03f45e008bed314feab.tar.gz gcc-079c35fabd59f10bb202a03f45e008bed314feab.tar.bz2 |
invoke.texi (Optimize Options): Document that -funit-at-a-time is enabled at -O and above.
* doc/invoke.texi (Optimize Options): Document that -funit-at-a-time
is enabled at -O and above.
From-SVN: r114140
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 ab18b41..8a500dd 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -4319,7 +4319,7 @@ 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 @@ -4360,6 +4360,7 @@ 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 @@ -4395,7 +4396,6 @@ 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 @@ -5343,7 +5343,7 @@ 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 -fweb @opindex fweb |