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Clarify that -O2 sets -fstrict-aliasing 

From-SVN: r51097
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Michael Meissner 2002-03-20 22:56:33 +00:00 committed by Michael Meissner
parent 86d8c251a1
commit 852b81bbe0
2 changed files with 13 additions and 4 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2002-03-20 Michael Meissner <meissner@redhat.com>
* doc/invoke.texi (Optimize Options): Document that -O2 sets
-fstrict-aliasing.
2002-03-20 Bob Wilson <bob.wilson@acm.org>
* config/xtensa/xtensa.h (ASM_OUTPUT_POOL_PROLOGUE): Emit a

12
gcc/doc/invoke.texi
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@ -3170,10 +3170,11 @@ perform loop unrolling or function inlining when you specify @option{-O2}.
As compared to @option{-O}, this option increases both compilation time
and the performance of the generated code.
@option{-O2} turns on all optional optimizations except for loop unrolling,
function inlining, and register renaming. It also turns on the
@option{-fforce-mem} option on all machines and frame pointer elimination
on machines where doing so does not interfere with debugging.
@option{-O2} turns on all optional optimizations except for loop
unrolling, function inlining, and register renaming. It also turns on
the @option{-fforce-mem} and @option{-fstrict-aliasing} option on all
machines and frame pointer elimination on machines where doing so does
not interfere with debugging.
Please note the warning under @option{-fgcse} about
invoking @option{-O2} on programs that use computed gotos.
@ -3716,6 +3717,9 @@ node, an alias set for the node. Nodes in different alias sets are not
allowed to alias. For an example, see the C front-end function
@code{c_get_alias_set}.
For all machines, optimization level 2 and higher enables this flag by
default.
@item -falign-functions
@itemx -falign-functions=@var{n}
@opindex falign-functions