[patch] Ping: loop distribution for single nested loops

[Andi Kleen]

"Sebastian Pop" <sebpop@gmail.com> writes:
  
> +@item -ftree-loop-distribution
> +Perform loop distribution.  This flag can improve cache performance on
> +big loop bodies and allow further loop optimizations, like
> +parallelization or vectorization, to take place.
> +

Very brief

> +/* This pass performs loop distribution: for example, the loop
> +
> +   |DO I = 2, N
> +   |    A(I) = B(I) + C
> +   |    D(I) = A(I-1)*E
> +   |ENDDO
> +
> +   is transformed to 
> +
> +   |DOALL I = 2, N
> +   |   A(I) = B(I) + C
> +   |ENDDO
> +   |
> +   |DOALL I = 2, N
> +   |   D(I) = A(I-1)*E
> +   |ENDDO

It would be nice if this example was in the info file as part of the
flag description so that normal users can figure out what the
flag actually does.

-Andi