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| author | Michael Meissner <meissner@redhat.com> | 2002-03-20 22:56:33 +0000 |
|---|---|---|
| committer | Michael Meissner <meissner@gcc.gnu.org> | 2002-03-20 22:56:33 +0000 |
| commit | 852b81bbe00b28c8a472c148c8fc84f6ecee9c3b (patch) | |
| tree | 97f48e826d285fb44bde95211ba49b566a9eb596 | |
| parent | 86d8c251a1e4f5f16a94ddcb42ccbedcf1416941 (diff) | |
| download | gcc-852b81bbe00b28c8a472c148c8fc84f6ecee9c3b.zip gcc-852b81bbe00b28c8a472c148c8fc84f6ecee9c3b.tar.gz gcc-852b81bbe00b28c8a472c148c8fc84f6ecee9c3b.tar.bz2 | |
Clarify that -O2 sets -fstrict-aliasing
From-SVN: r51097
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/doc/invoke.texi | 12 |
2 files changed, 13 insertions, 4 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index a399429..2a071c3 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -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 diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index abb9638..52af61d 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -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 |