From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.3 required=5.0 tests=BAYES_00,INVALID_MSGID
	autolearn=no autolearn_force=no version=3.4.4
X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 103376,270d47706116d3c
X-Google-Attributes: gid103376,public
From: dewar@cs.nyu.edu (Robert Dewar)
Subject: Re: Can compilers do this?
Date: 1996/02/23
Message-ID: <dewar.825137171@schonberg>#1/1
X-Deja-AN: 140885505
references: <4gjd6g$mfq@newsbf02.news.aol.com>
organization: Courant Institute of Mathematical Sciences
newsgroups: comp.lang.ada
Date: 1996-02-23T00:00:00+00:00
List-Id: <comp.lang.ada>

BwB says

"Also, suppose Y and X are floating point variables, and M and B are
CONSTANT floating point variables (not named numbers) initialized to
1.0  and  0.0  respectively. If one writes

     Y := M * X  +  B ;

can (and will) any compiler reduce this to

     Y := X ;


Sure, this is just standard constant propagation, a very common
optimization.