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Re: Global register variables (bugs #7871, #10684, and #11413)

From: Jim Wilson <wilson at tuliptree dot org>
To: Simon Marlow <simonmar at microsoft dot com>
Cc: gcc at gcc dot gnu dot org
Date: Sat, 06 Sep 2003 21:05:01 -0700
Subject: Re: Global register variables (bugs #7871, #10684, and #11413)
References: <3429668D0E777A499EE74A7952C382D1BE6C5D@EUR-MSG-01.europe.corp.microsoft.com>

Simon Marlow wrote:

There are various problems with global register variables in the 3.x
series, see for example bugs #7871, #10684, and #11413.  Code with
global register variables gets miscompiled.

This is still on my to do list, but I have no idea when I will get back to it. I solved one of my problems tonight though. I just bought a PowerMac G5, so I can now look at the PowerPC testcases more easily, and that will make it easier for me to work on this problem. Previously I only had x86 machines, and there was a lack of good x86 testcases.

Fortunately it doesn't seem to affect x86 (although that might be
accidental),

It is easy to write testcases that fail on x86. As a practical matter though, the x86 has so few allocatable registers that if you use global registers you will run into other problems. Thus they are rarely used, and hence few x86 users have noticed that they are broken. -- Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com

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