diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 4864d75bb6672a3d880278e785ae885a219c9b5c..27e7b8f0a75210f8cccbfae96a5630e9f1042303 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2017-03-28  Martin Liska  <mliska@suse.cz>
+
+	PR ipa/80104
+	* cgraphunit.c (cgraph_node::expand_thunk): Mark argument of a
+	thunk call as DECL_GIMPLE_REG_P when vector or complex type.
+
 2017-03-28  Claudiu Zissulescu  <claziss@synopsys.com>
 	    Thomas Petazzoni  <thomas.petazzoni@free-electrons.com>
 
diff --git a/gcc/cgraphunit.c b/gcc/cgraphunit.c
index c82a88a599ca61b068dd9783d2a6158163809b37..8635e3bd0e91cb9346784ee3fd2cddd6e4fb5a9b 100644
--- a/gcc/cgraphunit.c
+++ b/gcc/cgraphunit.c
@@ -1806,6 +1806,10 @@ cgraph_node::expand_thunk (bool output_asm_thunks, bool force_gimple_thunk)
 	for (; i < nargs; i++, arg = DECL_CHAIN (arg))
 	  {
 	    tree tmp = arg;
+	    if (VECTOR_TYPE_P (TREE_TYPE (arg))
+		|| TREE_CODE (TREE_TYPE (arg)) == COMPLEX_TYPE)
+	      DECL_GIMPLE_REG_P (arg) = 1;
+
 	    if (!is_gimple_val (arg))
 	      {
 		tmp = create_tmp_reg (TYPE_MAIN_VARIANT
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 93c9f9efed492afcd1abcab80d93a4224157bb44..a896f753719897c3f92cf5f886f3a9f1066c6755 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2017-03-28  Martin Liska  <mliska@suse.cz>
+
+	PR ipa/80104
+	* gcc.dg/ipa/pr80104.c: New test.
+
 2017-03-28  Marek Polacek  <polacek@redhat.com>
 
 	PR sanitizer/80067
diff --git a/gcc/testsuite/gcc.dg/ipa/pr80104.c b/gcc/testsuite/gcc.dg/ipa/pr80104.c
new file mode 100644
index 0000000000000000000000000000000000000000..7e75c9907e7d292bcabb815887b36a2520c714b7
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/ipa/pr80104.c
@@ -0,0 +1,15 @@
+/* PR ipa/80104 */
+/* { dg-do compile } */
+/* { dg-options "-fipa-icf" } */
+
+float
+a (_Complex float b)
+{
+  return *&b;
+}
+
+float
+c (_Complex float b)
+{
+  return (&b)[0];
+}