GCC beaten by ICC in stupid trig test!

[Dale Johannesen]

On Mar 24, 2004, at 11:39 AM, Richard Guenther wrote:

> Joseph S. Myers wrote:
>> On Wed, 24 Mar 2004, Paul Koning wrote:
>>> I don't have a C standard, but my copy of Harbison & Steele says what
>>> I expected about parentheses: "Parentheses do not necessarily force a
>>> particular evaluation order".
>> Evaluation order (sequence points) has nothing to do with 
>> associativity.  The C syntax specifies that a+b+c means exactly 
>> (a+b)+c - but in both cases, a, b and c can be evaluated in any 
>> order.
>
> Browsing through the standard I cannot find anything supporting this. 
> Can you point me to the right section?  You may be reffering to 6.5 
> (3), but that is overly vague and doesn't mention grouping by 
> parantheses at all ("The grouping of operators and operands is 
> specified by the syntax").  And 6.5.1 (5) seems to be ambiguous, too.
>
> Apart from evaluation order, I only can find phrases weakening control 
> over FP, like 6.5 paragraphs 5 and 8.

5.1.2.3 discusses the matter at length.