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From: gwyn@Brl-Vld.ARPA (VLD/VMB)
Newsgroups: net.lang.c
Subject: Re:  C question
Message-ID: <9879@brl-tgr.ARPA>
Date: Thu, 11-Apr-85 11:31:22 EST
Article-I.D.: brl-tgr.9879
Posted: Thu Apr 11 11:31:22 1985
Date-Received: Sat, 13-Apr-85 04:32:58 EST
Sender: news@brl-tgr.ARPA
Lines: 14

The compiler is perfectly within its rights in making
	x = 5;
	x = x++;
result in x==5 sometimes and x==6 other times.  This
is one of the implementation-dependent aspects of the
C language, intended to allow better overall code
generation.  You should not write such source code.

If there is a
	movl	r11,r11
in your output, then you must not have invoked the C
optimizer (cc -O option).  To make code generation
easier and more reliable, the main compiler relies
on the optimizer to clean up such things.