Path: utzoo!telly!attcan!uunet!tut.cis.ohio-state.edu!heather.pooh.com!bruce
From: bruce@heather.pooh.com (Bruce Robertson)
Newsgroups: gnu.gcc.bug
Subject: cc -O2 produces better code than gcc 1.34 -O on Sun 3
Message-ID: <m0f2fTq-0002UtC@heather.pooh.com>
Date: 21 Mar 89 06:44:00 GMT
References: <8903201546.aa23080@PARIS.ICS.UCI.EDU>
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How is it the Sun compiler is smart enough do to all that, and then
generates code like this:

	addql	#1,d1	| come on, this is just silly to miss!
	addql	#1,d1	|
	movl	d1,a0@
	moveq	#0,d0	| this is a "void" function, why return a value?
	unlk	a6
	rts

I do agree that specifying "-fstrength-reduce" to gcc should optimize
all those complex indexing addressing modes into a direct pointer to
the address of "a[i]".