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Re: [RFC PATCH, x86_64] Use -mno-sse[,2] to fall back to x87 FP argument passing convention

From: "Uros Bizjak" <ubizjak at gmail dot com>
To: "Michael Matz" <matz at suse dot de>
Cc: "GCC Patches" <gcc-patches at gcc dot gnu dot org>
Date: Mon, 9 Oct 2006 12:12:02 +0200
Subject: Re: [RFC PATCH, x86_64] Use -mno-sse[,2] to fall back to x87 FP argument passing convention
References: <5787cf470610040249q3186839mc4b15f6de23e63f1@mail.gmail.com> <Pine.LNX.4.64.0610090935430.4864@wotan.suse.de>

Hello Michael!

> In current state of x86_64 affairs, user can select -mfpmath=387 to
> instruct the compiler to use x87 FP instructions.

FWIW, I think -mfpmath=387 should actually give an error with -m64.  I
want all traces of x87 to die a silent death.  For x86 that's impossible,
we should not do anything to make it impossible for x86-64.


XFmode arguments use x87 registers on x86-64. It looks that x87 will
be with us for a long time...

Uros.

Follow-Ups:
- Re: [RFC PATCH, x86_64] Use -mno-sse[,2] to fall back to x87 FP argument passing convention
  - From: Jan Hubicka
- RE: [RFC PATCH, x86_64] Use -mno-sse[,2] to fall back to x87 FP argument passing convention
  - From: Menezes, Evandro

References:
- [RFC PATCH, x86_64] Use -mno-sse[,2] to fall back to x87 FP argument passing convention
  - From: Uros Bizjak
- Re: [RFC PATCH, x86_64] Use -mno-sse[,2] to fall back to x87 FP argument passing convention
  - From: Michael Matz

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