[PATCH] PR68212, Correct frequencies/counts when unrolling

Jeff Law law@redhat.com
Thu Oct 13 18:31:00 GMT 2016


On 09/20/2016 03:27 PM, Pat Haugen wrote:
> The following patch corrects frequency/count values computed when generating the switch blocks/peeled loop copies before the loop. The two main problem areas were for the peeled copies duplicate_loop_to_header_edge was not using the preheader frequency as part of the scale factor when peeling a copy of the loop to the preheader edge, and the second was that the switch block generation was just totally lacking code to compute correct freq/count values. Verified by comparing freq/count values in the unroller dump before/after.
>
> Bootstrap/regtest on powerpc64le with no new regressions. Ok for trunk?
>
> -Pat
>
>
>
> 2016-09-20  Pat Haugen  <pthaugen@us.ibm.com>
>
> 	PR rtl-optimization/68212
> 	* cfgloopmanip.c (duplicate_loop_to_header_edge): Use preheader edge
> 	frequency when computing scale factor for peeled copies.
> 	* loop-unroll.c (unroll_loop_runtime_iterations): Fix freq/count
> 	values for switch/peel blocks/edges.
>
>
OK.  Thanks for your patience.

Jeff



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