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Re: Pentium and second pipeline
- To: Richard Henderson <rth at cygnus dot com>
- Subject: Re: Pentium and second pipeline
- From: Jeffrey A Law <law at cygnus dot com>
- Date: Wed, 16 Sep 1998 22:51:52 -0600
- cc: Jan Hubicka <hubicka at atrey dot karlin dot mff dot cuni dot cz>, egcs at cygnus dot com
- Reply-To: law at cygnus dot com
In message <19980916183936.A29796@dot.cygnus.com>you write:
> On Tue, Sep 15, 1998 at 01:25:22PM +0200, Jan Hubicka wrote:
> > After looking at define_function_unit definitions in i386.md, it looks
> > like the old definition was wrong, since it didn't tell scheduler nothing
> > about second pipeline.
>
> Attempting to describe the pentium pipelines is basically meaningless
> until the md file is reworked to accurately classify the instruction
> that will be output.
And to avoid outputting multiple instructions per insn whenever
possible.
jeff