Re: Vector assignment semantics (was Re: latest trends in compiler optimization research?)

Tom Linden wrote:


> On Sun, 19 Aug 2007 22:12:19 -0700, James J. Weinkam <jjw@cs.sfu.ca> wrote:


(snip)


>>1. Array expressions are evaluated element by element in row major
>>order, and


>>2. An array assignment is equivalent to a set of nested loops which
>>effectively perform a series of scalar assignments in row major
>>order.


>>This obviates the need for array temporaries except for the final
>>result of an array expression.


(snip)


> We do the same with our (ANSI) compiler.


I thought this started with the note that ANSI didn't do it that way.
That would seem to mean that you have a non-ANSI compiler. (But
probably more compatible with others.)


Note which standards IBM claims for their compiler:


http://publibfp.boulder.ibm.com/cgi-bin/bookmgr/BOOKS/ibmol004/FRONT_1.6


-- glen
[As far as I can tell, the 1976 ANSI PL/I standard says nothing at all about
the order of evaluation of array expressions. But it's very hard to read and
it's possible I missed something. -John]

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