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Re: Fix recent SPEC2000/x86-64 ICEs

From: Richard Henderson <rth at redhat dot com>
To: Roger Sayle <roger at eyesopen dot com>
Cc: Jan Hubicka <jh at suse dot cz>, gcc-patches at gcc dot gnu dot org
Date: Sun, 29 Jun 2003 20:55:33 -0700
Subject: Re: Fix recent SPEC2000/x86-64 ICEs
References: <20030629230601.GK23852@kam.mff.cuni.cz> <Pine.LNX.4.44.0306291656300.7093-100000@www.eyesopen.com>

On Sun, Jun 29, 2003 at 05:03:53PM -0600, Roger Sayle wrote:
> One quick question.  On x86-64 in 128-bit long double mode does the x87
> instruction "fldpi" load an 80-bit or 128-bit approximation to pi?  I
> know nothing about AMD64, but it looks like your patch just extends the
> truncated 80-bit value.  Its just that this seems a bit odd.

amd64, like ia64, lies about the 128-bit-ness.
It's the normal 387 value with extra padding.


r~

References:
- Fix recent SPEC2000/x86-64 ICEs
  - From: Jan Hubicka
- Re: Fix recent SPEC2000/x86-64 ICEs
  - From: Roger Sayle

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