From: Andrew MacLeod <amacleod@redhat.com>
Date: Mon, 27 Sep 2021 22:53:54 +0000 (-0400)
Subject: Ranger: More efficient zero/nonzero check.
X-Git-Tag: basepoints/gcc-13~4104
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=4b8ca6c6177b2bd948c1cb2a116955b942751559;p=thirdparty%2Fgcc.git

Ranger: More efficient zero/nonzero check.

A recent change introduced a frequent check for zero and non-zero which has
caused a lot of extra temporary trees to be created.  Make the check more
efficent as it is always a pointer and thus unsigned.

	* gimple-range-cache.cc (non_null_ref::adjust_range): Check for
	zero and non-zero more efficently.
---

diff --git a/gcc/gimple-range-cache.cc b/gcc/gimple-range-cache.cc
index 61043d3f3750..91dd5a5c0871 100644
--- a/gcc/gimple-range-cache.cc
+++ b/gcc/gimple-range-cache.cc
@@ -98,9 +98,10 @@ non_null_ref::adjust_range (irange &r, tree name, basic_block bb,
     return false;
 
   // We only care about the null / non-null property of pointers.
-  if (!POINTER_TYPE_P (TREE_TYPE (name)) || r.zero_p () || r.nonzero_p ())
+  if (!POINTER_TYPE_P (TREE_TYPE (name)))
+    return false;
+  if (r.undefined_p () || r.lower_bound () != 0 || r.upper_bound () == 0)
     return false;
-
   // Check if pointers have any non-null dereferences.
   if (non_null_deref_p (name, bb, search_dom))
     {