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Re: [tree-ssa] Fix gcc.dg/tree-ssa/20030530-2.c
On 11 Jun 2003 10:24:45 -0400, Diego Novillo <dnovillo@redhat.com> wrote:
> On Wed, 2003-06-11 at 10:12, law@redhat.com wrote:
>
>> Doing these things exposes a latent but in how we set may_optimize_p for
>> expresssions. Namely we set it for expressions in which TREE_SIDE_EFFECTS
>> is set. tsk tsk.
> I thought that TREE_SIDE_EFFECTS should not be set on GIMPLE
> expressions, with the exception of CALL_EXPRs.
Don't forget volatile.
> Aren't you just papering over a gimplification bug here?
He fixed that bug, too. :)
> Also, don't we recognize functions whose calls can be elided if they're
> called with the same arguments repeatedly? (I forget the technical term
> :)
"pure". Not yet, because of TREE_SIDE_EFFECTS. Perhaps we shouldn't set
TREE_SIDE_EFFECTS on calls to pure functions.
Jason