[PATCH] Fix PR 23525 - Separate header mass propagation in irregular loops.

[Diego Novillo]

On Wed, Jun 10, 2015 at 2:47 AM, David <davidxl at google.com> wrote:

> ================
> Comment at: include/llvm/Analysis/BlockFrequencyInfoImpl.h:1057
> @@ -1045,1 +1056,3 @@
> +
> +    adjustLoopHeaderMass(Loop);
>    } else {
> ----------------
> Should this be done iteratively? The mass propagation before this call is
> based on wrong initial masses for loop headers.
>

Yeah, iterating a fixed number of times here would give us a better
approximation. I was thinking of tuning this after the initial fix.

Diego.
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