From: Martin Liska <mliska@suse.cz>
Date: Fri, 13 Aug 2021 10:35:47 +0000 (+0200)
Subject: ipa: ICF should check SSA_NAME_IS_DEFAULT_DEF
X-Git-Tag: releases/gcc-11.3.0~1023
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=64336a85c96ef91f863bd8e86aa5002c3c69f386;p=thirdparty%2Fgcc.git

ipa: ICF should check SSA_NAME_IS_DEFAULT_DEF

	PR ipa/100600

gcc/ChangeLog:

	* ipa-icf-gimple.c (func_checker::compare_ssa_name): Do not
	  consider equal SSA_NAMEs when one is a param.

gcc/testsuite/ChangeLog:

	* gcc.dg/ipa/pr100600.c: New test.
---

diff --git a/gcc/ipa-icf-gimple.c b/gcc/ipa-icf-gimple.c
index edf5f0256273..cf0262621be7 100644
--- a/gcc/ipa-icf-gimple.c
+++ b/gcc/ipa-icf-gimple.c
@@ -96,6 +96,9 @@ func_checker::compare_ssa_name (const_tree t1, const_tree t2)
   unsigned i1 = SSA_NAME_VERSION (t1);
   unsigned i2 = SSA_NAME_VERSION (t2);
 
+  if (SSA_NAME_IS_DEFAULT_DEF (t1) != SSA_NAME_IS_DEFAULT_DEF (t2))
+    return false;
+
   if (m_source_ssa_names[i1] == -1)
     m_source_ssa_names[i1] = i2;
   else if (m_source_ssa_names[i1] != (int) i2)
diff --git a/gcc/testsuite/gcc.dg/ipa/pr100600.c b/gcc/testsuite/gcc.dg/ipa/pr100600.c
new file mode 100644
index 000000000000..8a3d0e16e7e0
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/ipa/pr100600.c
@@ -0,0 +1,22 @@
+/* PR ipa/100600 */
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+int a, b, c;
+long d(long x, long e, long f, long g) {
+  long h, i;
+  for (; h < e; h++) {
+    i = f;
+    for (; i < g; i++)
+      c = b + a;
+  }
+  return h + i;
+}
+
+long j(long x, long e, long y, long g) {
+  long h, i;
+  for (; h < e; h++)
+    for (; i < g; i++)
+      c = b + a;
+  return h + i;
+}