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Re: [tree-ssa] Allow next field to point to the same field
- From: Andrew MacLeod <amacleod at redhat dot com>
- To: Jeff Law <law at redhat dot com>
- Cc: Jan Hubicka <hubicka at ucw dot cz>, Jan Hubicka <jh at suse dot cz>, Daniel Berlin <dberlin at dberlin dot org>, gcc-patches <gcc-patches at gcc dot gnu dot org>, Richard Henderson <rth at redhat dot com>
- Date: 02 Dec 2003 18:29:21 -0500
- Subject: Re: [tree-ssa] Allow next field to point to the same field
- References: <200312022244.hB2MiU78017732@speedy.slc.redhat.com>
On Tue, 2003-12-02 at 17:44, law@redhat.com wrote:
> In message <20031202220036.GH25126@atrey.karlin.mff.cuni.cz>, Jan Hubicka write
> s:
> >I saw it when there has been dead annotations kept after de-ssa pass, so
> >I would assume that de-SSA pass uses this field some bookkeeping.
> Nope, to the best of my knowledge out-of-ssa doesn't modify that field
> at all -- it uses its contents to know if a variable might be live at
> the start of the function, but the contents are not modified.
>
Correct, that field is only referenced to check for error conditions, it
never modifies it.
Andrew