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Re: Register pressure analysis

From: Vladimir Makarov <vmakarov at redhat dot com>
To: Sergey Ostanevich <sergos dot gnu at gmail dot com>
Cc: gcc at gcc dot gnu dot org
Date: Wed, 27 Jul 2011 10:51:11 -0400
Subject: Re: Register pressure analysis
References: <CAGYS_TLUwcf9E=O6WVzNuMJX1jxY-=DrBCtp1DG+m04qmE1YfA@mail.gmail.com> <CAGYS_TJD2HwmEM4GZQw0Cy=43ALrjbA1S9m8oYQBFaPCn4Ug0g@mail.gmail.com>

On 07/27/2011 10:26 AM, Sergey Ostanevich wrote:

Hello!

Is there any scripts/tools that parse GCC dumps and report register
pressure in the dump - either overall, or in different parts of the
dump?

-fdump-rtl-ira creates an info dump of IRA. There is info about maximal pressure for each region (currently loops) and each register pressure class. Loop 0 corresponds to all program. By default, a loop region is created when register pressure is high. If you need to see register pressure for all loops you can use option -fira-region=all.

References:
- Register pressure analysis
  - From: Sergey Ostanevich

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