Re: [PATCH] PR68212, Correct frequencies/counts when unrolling

[Jeff Law]

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  

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

PING Re: [PATCH] PR68212, Correct frequencies/counts when unrolling

[Pat Haugen]

Ping for the following patch 
https://gcc.gnu.org/ml/gcc-patches/2016-09/msg01363.html

-Pat