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haifa-sched.c
- To: gcc-bugs at gcc dot gnu dot org
- Subject: haifa-sched.c
- From: "phani narasimhan venkata sesha myreddy" <phani dot sesha at wipro dot com>
- Date: Wed, 26 Jul 2000 20:21:44 +0530
- Organization: WIPRO
sir,
i am using gcc to study the scheduling of ultrasparc.
The file haifa-sched.c contains the global variable
"last_scheduled_insn".
It should be an array of ISSUE_RATE.
The function schedule_block() updates the "last_scheduled_insn"
whenever an insn is moved from the ready list to the fired list.
For super-scalars like ultrasparc, where the issue-rate is 4
the last_sheduled_insn should be an array of 4.
SHED_SORT->qsort->rank_for_schedule()
uses the last_scheduled_insn, for calculating tmp_class and
sorts the insns based on the value returned by the insn_cost().
If last_scheduled_insn is made an array of the ISSUE_RATE
and tmp_class+= tmp_class, a more accurate value of the data_hazard
of the insn can be obtained in the rank_of_schedule().
sincierly,
phani.
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