From: Jan Hubicka <hubicka@ucw.cz>
Date: Wed, 28 May 2025 10:23:48 +0000 (+0200)
Subject: Fix profile_probability quality of switch
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8058e1f8857d580698c29590273e72c61de2c121;p=thirdparty%2Fgcc.git

Fix profile_probability quality of switch

This fixes ages old bug I noticed only now where switch cases, in situation
prediction is completely missing, gets all equal probability that should be
GUESSED instead of ADJUSTED.

gcc/ChangeLog:

	* predict.cc (set_even_probabilities): Set quality to guessed.
---

diff --git a/gcc/predict.cc b/gcc/predict.cc
index ef31c48bfe2..16dd9b01112 100644
--- a/gcc/predict.cc
+++ b/gcc/predict.cc
@@ -961,7 +961,7 @@ set_even_probabilities (basic_block bb,
 	    if (unlikely_edges != NULL && unlikely_edges->contains (e))
 	      e->probability = profile_probability::very_unlikely ();
 	    else
-	      e->probability = all / scale;
+	      e->probability = (all / scale).guessed ();
 	  }
 	else
 	  e->probability = profile_probability::never ();