On 17 January 2024 14:20:49 CET, Jan Hubicka wrote:
>--- a/gcc/predict.def
>+++ b/gcc/predict.def
>@@ -94,6 +94,16 @@ DEF_PREDICTOR (PRED_LOOP_ITERATIONS_GUESSED, "guessed loop
>iterations",
> DEF_PREDICTOR (PRED_LOOP_ITERATIONS_MAX, "guessed loop iterations",
> PROB_UNINITIALIZED,
>
> Please fill in what has changed, both for predict-18.c and predict.{cc,def}
> changes.
Sorry, I re-generated the patch after fixing some typos and forgot to
copy over the changelog.
>
> > @@ -2613,24 +2658,40 @@ expr_expected_value_1 (tree type, tree op0, enum
> > tree_code code,
> >
On Wed, Jan 17, 2024 at 01:45:18PM +0100, Jan Hubicka wrote:
> Hi,
> expr_expected_value is doing some guesswork when it is merging two or more
> independent value predictions either in PHI node or in binary operation.
> Since we do not know how the predictions interact with each other, we can
> no
Hi,
expr_expected_value is doing some guesswork when it is merging two or more
independent value predictions either in PHI node or in binary operation.
Since we do not know how the predictions interact with each other, we can
not really merge the values precisely.
The previous logic merged the pre
