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Re: Store scheduling with DFA scheduler

From: Vladimir Makarov <vmakarov at redhat dot com>
To: Jon Beniston <jon at beniston dot com>
Cc: gcc at gcc dot gnu dot org
Date: Tue, 26 Apr 2005 09:41:56 -0400
Subject: Re: Store scheduling with DFA scheduler
References: <200504251936.j3PJaPCA002840@mx3.redhat.com>

Jon Beniston wrote:

Hi,

I'm trying to get the DFA scheduler in GCC 4.0.0 to schedule loads and
stores, but I can only get it to work for loads. I have an automaton defined
as follows:

(define_automaton "cpu")

(define_cpu_unit "x" "cpu")
(define_cpu_unit "m" "cpu")

(define_insn_reservation "arith" 1 (eq_attr "type" "arith") "x")
(define_insn_reservation "loads" 2 (eq_attr "type" "load") "x,m")
(define_insn_reservation "stores" 3 (eq_attr "type" "store") "x,m*2")

All instructions take one cycle in "x". Loads then take one "m" cycle, while
stores take two "m" cycles. Basically stores aren't fully pipelined.

There is not enough information to say what is wrong. It would be better if you send gcc output when -fsched-verbose=10 is used.

Vlad

Follow-Ups:
- RE: Store scheduling with DFA scheduler
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