From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Edelsohn <dje@watson.ibm.com>
To: Geoffrey KEATING <geoffk@discus.anu.edu.au>
Cc: hjl@lucon.org (H.J. Lu), zack@rabi.phys.columbia.edu (Zack Weinberg), egcs@cygnus.com, libc-linux@gnu.org (GNU C Library)
Subject: Re: A patch for libm-ieee754 
Date: Sun, 22 Feb 1998 18:39:00 -0000
Message-id: <9802230237.AA33074@rios1.watson.ibm.com>
References: <199802230218.NAA13525@discus.anu.edu.au>
X-SW-Source: 1998-02/msg01038.html

>>>>> Geoffrey KEATING writes:

Geoff> Do _not_ mark the variables 'volatile'.  This causes a performance
Geoff> reduction on sparc and powerpc, and probably on alpha and x86 too,
Geoff> because of the memory traffic it generates.

	On PowerPC you probably also need -mno-fused-madd option to
disable use of the fma, etc. instructions because of the intermediate
extended precision.  Note that this will halve FP performance in some
cases. 

David