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invoke.texi (Optimize Options): Document that -funit-at-a-time is enabled at -O and above.

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* doc/invoke.texi (Optimize Options): Document that -funit-at-a-time
	is enabled at -O and above.

From-SVN: r114139
This commit is contained in:
Eric Botcazou 2006-05-26 20:03:06 +00:00
parent 4d08533cd4
commit c539d4635b
2 changed files with 9 additions and 4 deletions
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gcc/ChangeLog
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@ -1,4 +1,9 @@
2006-05-24 Steven Bosscher <steven@gcc.gnu.org>
2006-05-26 Eric Botcazou <ebotcazou@adacore.com>
* doc/invoke.texi (Optimize Options): Document that -funit-at-a-time
is enabled at -O and above.
2006-05-26 Steven Bosscher <steven@gcc.gnu.org>
PR target/27571
* config/alpha/alpha.c (alpha_does_function_need_gp): Skip jump

6
gcc/doc/invoke.texi
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@ -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}