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Re: Dealing with NOP instructions
- From: Eric Christopher <echristo at redhat dot com>
- To: Hsin-Hsien Wu <sinsen dot wu at msa dot hinet dot net>
- Cc: gcc at gcc dot gnu dot org
- Date: Wed, 30 Jun 2004 00:44:42 -0700
- Subject: Re: Dealing with NOP instructions
- References: <200406300735.PAA25077@msr57.hinet.net>
On Wed, 2004-06-30 at 00:31, Hsin-Hsien Wu wrote:
> Hello,
> Does any one know about how gcc instruction scheduler deals with the
> nop operation?
However you tell it. See define_attr in gcc/config/mips/mips.md and look
for nop. Then look for the attribute in a scheduling description, e.g.
3000.md.
> What would happen if there is a pipeline stall?
Then you stall? Perhaps this question isn't asking what you really
meant?
-eric
--
Eric Christopher <echristo@redhat.com>