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Re: First scheduling pass

From: Dale Johannesen <dalej at apple dot com>
To: David Edelsohn <dje at watson dot ibm dot com>
Cc: Dale Johannesen <dalej at apple dot com>, "Sanjiv Kumar Gupta, Noida" <sanjivg at noida dot hcltech dot com>, gcc at gcc dot gnu dot org, vmakarov at redhat dot com, joern dot rennecke at superh dot com
Date: Thu, 27 Mar 2003 09:54:42 -0800
Subject: Re: First scheduling pass

On Thursday, March 27, 2003, at 07:41 AM, David Edelsohn wrote:

Sanjiv Kumar Gupta, Noida writes:
Sanjiv> Here, I can't get the scheduler to move the loads to the Sanjiv> top of the basic block. This is because the first scheduling pass Sanjiv> for SH is disabled. Enabling the first scheduling pass causes excessive Sanjiv> register pressure resulting in lots of spills generated by the register Sanjiv> allocator.
	We have found excessive speculation, but not excessive register
pressure.  You might try decreasing the issue rate to "1" for the first
scheduling pass, as I did for PowerPC.

I've certainly seen excessive register pressure in some cases, and so have other people here; I have several bug reports on it.

References:
- Re: First scheduling pass
  - From: David Edelsohn

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