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Re: [RFC] Kill gen_sequence
- From: Alexandre Oliva <aoliva at redhat dot com>
- To: "David S. Miller" <davem at redhat dot com>
- Cc: gcc-patches at gcc dot gnu dot org
- Date: 07 Jun 2002 01:37:52 -0300
- Subject: Re: [RFC] Kill gen_sequence
- Organization: GCC Team, Red Hat
- References: <20020606.023343.112819990.davem@redhat.com>
On Jun 6, 2002, "David S. Miller" <davem@redhat.com> wrote:
> One minor piece of lossage results from this patch. Basically
> splitters are no longer allowed to emit no instructions, they have to
> emit some RTL. The reason for this is that now that all of the
> generators return an INSN list, there is no easy way to distinguish
> between "no splitter matched" and "splitter matched but no insns
> emitted".
Without having looked at the code, I wonder if we could use a global,
constant structure (say (const_int 0) or a unique (sequence []) to
tell unmatched splitters from ones that emit an empty sequence.
--
Alexandre Oliva Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer aoliva@{cygnus.com, redhat.com}
CS PhD student at IC-Unicamp oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist Professional serial bug killer