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Re: -mno-80387 and MMX autovectorisation

From: Andrew Pinski <pinskia at physics dot uc dot edu>
To: Uros Bizjak <ubizjak at gmail dot com>
Cc: "GCC Development" <gcc at gcc dot gnu dot org>, "Roger Sayle" <roger at eyesopen dot com>
Date: Thu, 8 Jun 2006 08:50:13 -0700
Subject: Re: -mno-80387 and MMX autovectorisation
References: <5787cf470606072313s658af744id4fccf9cadb988f7@mail.gmail.com>

On Jun 7, 2006, at 11:13 PM, Uros Bizjak wrote:

Hello!

Current mainline gcc can efficiently disable x87 instruction when
-mno-80387 switch is used. In this case, MMX registers can be used for
the autovectorisation even without emms or femms instructions to
switch back to x87 mode.


I don't think so, because another function could use x87 instructions
even without you knowing it.

-- Pinski

References:
- -mno-80387 and MMX autovectorisation
  - From: Uros Bizjak

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