Re: gcc, support, for, nested, low-overhead, looping

[Michael Hayes <m dot hayes at elec dot canterbury dot ac dot nz>]

Saira writes:

 > However, the loop optimizer fails to use these
 > patterns for outer loops in some cases--for example
 > when the loop's index variable is declared global. e.g

This I believe is fair punishment for using a global variable
as a loop counter :-)

<code snipped>

 > In the above code the loop optimizer will only insert
 > the doloop patterns for the inner loop and not the
 > outer loop.

What does the loop optimizer say when you compile with -dL?
It should indicate why it rejected optimising the outer loop.


Michael.