how to generate code-loops

[Tim Prince]

David Livshin wrote:
> Brian Budge wrote:
>> Hi David -
>>
>> a)  It looks like a loop to me.
> No it is not a loop, at least not a loop I would like to have. Perhaps I 
> had to mention this in my message, but the boy of the "loop" should be a 
> basic block ( no jump to/from it ) - the code generated is not a such.
>> b)  You instructed the compiler to unroll all loops, which is
>> apparently what it did.

When you ask gcc to unroll a loop, without vectorization, it will jump 
in at the appropriate point, rather than using a remainder loop.  If you 
are serious about wanting some other style, you could write out the 
details, including a main loop which works in dictated groups of 8 
iterations.