From: rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Tue, 28 Aug 2018 10:14:45 +0000 (+0000)
Subject: 2018-08-28  Richard Biener  <rguenther@suse.de>
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7366a0f04de736e4195d1ece3c07a82b60b83113;p=thirdparty%2Fgcc.git

2018-08-28  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/87117
	* tree-ssa-sccvn.c (fully_constant_vn_reference_p): Exclude
	void which is is_gimple_reg_type by checking for COMPLETE_TYPE_P.

	* gcc.dg/pr87117-1.c: New testcase.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@263911 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index dd3ca99c80ef..694fdf24db3f 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2018-08-28  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/87117
+	* tree-ssa-sccvn.c (fully_constant_vn_reference_p): Exclude
+	void which is is_gimple_reg_type by checking for COMPLETE_TYPE_P.
+
 2018-08-28  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/87117
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index aa6f7707333a..bf4f5f7c5c94 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2018-08-28  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/87117
+	* gcc.dg/pr87117-1.c: New testcase.
+
 2018-08-28  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/87117
diff --git a/gcc/testsuite/gcc.dg/pr87117-1.c b/gcc/testsuite/gcc.dg/pr87117-1.c
new file mode 100644
index 000000000000..06d700871be9
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr87117-1.c
@@ -0,0 +1,21 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fno-inline -fno-tree-dce" } */
+
+int a, b, c;
+long *d;
+void fn1()
+{
+  for (; 0 < a;)
+    a++;
+}
+void fn3()
+{
+  for (; c; c++)
+    d[c] = 0;
+}
+void fn2()
+{
+  if (b)
+    fn3();
+  fn1();
+}
diff --git a/gcc/tree-ssa-sccvn.c b/gcc/tree-ssa-sccvn.c
index 42676487c86b..381fc8dc1958 100644
--- a/gcc/tree-ssa-sccvn.c
+++ b/gcc/tree-ssa-sccvn.c
@@ -1408,6 +1408,7 @@ fully_constant_vn_reference_p (vn_reference_t ref)
 
   /* Simplify reads from constants or constant initializers.  */
   else if (BITS_PER_UNIT == 8
+	   && COMPLETE_TYPE_P (ref->type)
 	   && is_gimple_reg_type (ref->type)
 	   && (!INTEGRAL_TYPE_P (ref->type)
 	       || TYPE_PRECISION (ref->type) % BITS_PER_UNIT == 0))