From: Aldy Hernandez <aldyh@redhat.com>
Date: Wed, 27 Oct 2021 16:22:16 +0000 (+0200)
Subject: Kill known equivalences before a new assignment in the path solver.
X-Git-Tag: basepoints/gcc-13~3568
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=aeb10f8d2a6e1267c981a62dc8163af3b7607797;p=thirdparty%2Fgcc.git

Kill known equivalences before a new assignment in the path solver.

Every time we have a killing statement, we must also kill the relations
seen so far.  This is similar to what we did for the equivs inherent in
PHIs along a path.

Tested on x86-64 and ppc64le Linux.

gcc/ChangeLog:

	* gimple-range-path.cc
	(path_range_query::range_defined_in_block): Call killing_def.
---

diff --git a/gcc/gimple-range-path.cc b/gcc/gimple-range-path.cc
index 2f570a13e057..d8c2a9b6a863 100644
--- a/gcc/gimple-range-path.cc
+++ b/gcc/gimple-range-path.cc
@@ -288,8 +288,14 @@ path_range_query::range_defined_in_block (irange &r, tree name, basic_block bb)
 
   if (gimple_code (def_stmt) == GIMPLE_PHI)
     ssa_range_in_phi (r, as_a<gphi *> (def_stmt));
-  else if (!range_of_stmt (r, def_stmt, name))
-    r.set_varying (TREE_TYPE (name));
+  else
+    {
+      if (name)
+	get_path_oracle ()->killing_def (name);
+
+      if (!range_of_stmt (r, def_stmt, name))
+	r.set_varying (TREE_TYPE (name));
+    }
 
   if (bb)
     m_non_null.adjust_range (r, name, bb);