From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Thu,  9 Nov 1995 08:31:13 -0500
From: ken@plan9.att.com ken@plan9.att.com
Subject: No subject
Topicbox-Message-UUID: 3397c710-eac8-11e9-9e20-41e7f4b1d025
Message-ID: <19951109133113.EQKaI3epIDdthUkZm4SgZ7rwsbnNQJLtF94ks452Eo4@z>

> From: haertel@ichips.intel.com
> The "8c" compiler sometimes loses track of side effects in expressions
> whose values aren't used.  For example, the following program should
> print "1" but in fact prints "0".
> ...

thanks to haertel for finding this. my fix follows.
ken

21a22,24
> 	l = n->left;
> 	r = n->right;
> 	o = n->op;
23,24c26,31
< 		if(nn != Z)
< 			gmove(n, nn);
---
> 		if(nn == Z) {
> 			if(o == OINDEX)
> 				nullwarn(l, r);
> 			return;
> 		}
> 		gmove(n, nn);
28,30d34
< 	l = n->left;
< 	r = n->right;
< 	o = n->op;