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Re: Modulo Scheduling

From: Alexander Monakov <amonakov at ispras dot ru>
To: Cameron Lowell Palmer <cameron dot palmer at gmail dot com>
Cc: gcc at gcc dot gnu dot org
Date: Tue, 9 Feb 2010 18:53:24 +0300 (MSK)
Subject: Re: Modulo Scheduling
References: <bc4938831002020958p64e5afbag6e9dc9217131c94@mail.gmail.com>

On Tue, 2 Feb 2010, Cameron Lowell Palmer wrote:

Does Modulo Scheduling work on x86 platforms? I have tried adding in
various versions of the -fmodulo-sched option and get the exact same
output with or without. The application is a very simplistic matrix
multiply without dependencies.

No, at present SMS is not able to schedule any loops on x86 at all. This is due to implementation detail: SMS operates on loops that end with decrement-and-branch instruction, and GCC does not generate such instructions on x86.

Sorry.
Alexander Monakov

References:
- Modulo Scheduling
  - From: Cameron Lowell Palmer

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