From: Andrew Pinski <quic_apinski@quicinc.com>
Date: Wed, 4 Dec 2024 02:57:45 +0000 (-0800)
Subject: cfgexpand: Update cache during the original DFS walk
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=232f22615857cd83735770d82c7c0178e43bee19;p=thirdparty%2Fgcc.git

cfgexpand: Update cache during the original DFS walk

This is a small optimization which can improve how many times are need through the update loop.
It can reduce the number of times in the update loop by maybe 1 times.

Bootstrapped and tested on x86_64-linux-gnu.

gcc/ChangeLog:

	* cfgexpand.cc (vars_ssa_cache::operator()): Update the cache if the use is already
	has a cache.

Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>
---

diff --git a/gcc/cfgexpand.cc b/gcc/cfgexpand.cc
index 0e76d340d26..277ef659f30 100644
--- a/gcc/cfgexpand.cc
+++ b/gcc/cfgexpand.cc
@@ -766,7 +766,12 @@ vars_ssa_cache::operator() (tree name)
 
       /* If the cache exists for the use, don't try to recreate it. */
       if (exists (use))
-	continue;
+	{
+	  /* Update the cache here, this can reduce the number of
+	     times through the update loop below.  */
+	  update (old_name, use);
+	  continue;
+	}
 
       /* Create the cache bitmap for the use and also
 	 so we don't go into an infinite loop for some phi nodes with loops.  */