[windev] offtopic C cast

[Paul Stephenson]

Hello.

Apologies for the offtopic post but I was interested if any of you clever 
guys out there had a view on what the compiler might be doing here. I know 
the casting is horrible - I didn't write it.

I am developing embedded code using an IAR toolset and after upgrading to 
version 3.30A of the C compiler found the following compiler bug! after 
reducing the code to the minimum.

unsigned char c1=0, c2=15;
unsigned long x8  = 60000ul * ((unsigned long) (c1*256 + c2)); // not work 
(= 4294884256)
unsigned long x9  = 60000ul * (unsigned long)((unsigned long) (c1*256 + 
c2)); // not work (= 4294884256)
unsigned long x10 = ((unsigned long) (c1*256 + c2)); // ok (=15)
unsigned long x11  = 60000ul * ((unsigned long) (c1*256ul + c2)); // ok (= 
900000)

--
c1 and c2 defined as 16bit int also does not work

Thanks in advance.


Paul
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Paul Stephenson