Path: utzoo!utgpu!attcan!uunet!lll-winken!ames!xanth!nic.MR.NET!shamash!tank!mimsy!chris
From: chris@mimsy.UUCP (Chris Torek)
Newsgroups: comp.lang.c
Subject: Re: Broken compilers? (was Re: Comma Operator)
Message-ID: <15474@mimsy.UUCP>
Date: 15 Jan 89 15:41:48 GMT
References: <922@quintus.UUCP> <1904@buengc.BU.EDU>
Organization: U of Maryland, Dept. of Computer Science, Coll. Pk., MD 20742
Lines: 22

->	printf("%d %d %d\n", (x = 1, y = 2), x, y);

In article <1904@buengc.BU.EDU> bph@buengc.BU.EDU (Blair P. Houghton) writes:
-A while back, someone indicated that they knew of a compiler optimizer
-that would reduce something such as the above (ostensibly through
-constant-reduction) to
-
-printf("%d %d %d\n", (1,2), x, y);
-
-or maybe even
-
-printf("%d %d %d\n", 2, x, y);
-
-So, you compiler-writing C-programmers, is this thing broken or what?

Quite thoroughly, unless both x and y are `dead'.

The side effect(s), if any, of any expression that occurs anywhere
may not be arbitrarily deleted.
-- 
In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 7163)
Domain:	chris@mimsy.umd.edu	Path:	uunet!mimsy!chris