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Re: [tree-ssa] new -Wuninitialized warning
- From: Diego Novillo <dnovillo at redhat dot com>
- To: Jason Merrill <jason at redhat dot com>
- Cc: Andrew Macleod <amacleod at redhat dot com>, "gcc at gcc dot gnu dot org" <gcc at gcc dot gnu dot org>
- Date: 07 Jun 2003 13:41:28 -0400
- Subject: Re: [tree-ssa] new -Wuninitialized warning
- Organization: Red Hat Canada
- References: <wvlhe71lu2c.fsf@prospero.boston.redhat.com>
On Sat, 2003-06-07 at 12:40, Jason Merrill wrote:
> After I apply this patch to cp/pt.c, bootstrap fails with a warning about
> expr_type possibly being used uninitialized. This turns out to be because
> DCE is discarding the initial initialization of expr_type. This isn't
> actually a bug, since ssa->normal seems to be properly inserting
> initializations along all paths to uses, but it seems that the RTL flow
> graph isn't clever enough to realize that.
>
If the initialization is dead, there can't possibly be uses of that SSA
name of 'expr_type' further down. Those uses of the initial assignment
to 'expr_type' should've been copy propagated into 'foo', right?
I guess I'm missing something. I'll apply the patch and see.
Diego.