From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jason Moxham <J.L.Moxham@maths.soton.ac.uk>
To: gcc-help@gcc.gnu.org
Subject: -fPIC
Date: Sun, 19 Aug 2001 20:30:00 -0000
Message-id: <200108200330.EAA03633@malus.maths.soton.ac.uk>
X-SW-Source: 2001-08/msg00154.html

Using gcc-2.95.3 under linux x86

writing a  C asm wrapper for the "cpuid" instruction

asm volatile("cpuid" : "+a" (a) 
		     : "b" (b) , "c" (c) , "d" (d) : "cc");

works

but if compiled for shared libary  ie with -fPIC
then you get an asm error saying that " bx is allready used"

even changing specific registers to "g" and putting extra "movl" asm
instructions doesnt help

Not yet tried this under gcc-3.0 

I heard that shared libs are slight slower than static libs ?
is this because an extra register is "used" ?

Jason Moxham
j.l.moxham@maths.soton.ac.uk