From: Richard Biener <rguenther@suse.de>
Date: Mon, 2 Dec 2019 10:50:45 +0000 (+0000)
Subject: re PR tree-optimization/92742 (ICE in info_for_reduction, at tree-vect-loop.c:4367)
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=2679730bab0202e7591adc6ac0ea1347b8954983;p=gcc.git

re PR tree-optimization/92742 (ICE in info_for_reduction, at tree-vect-loop.c:4367)

2019-12-02  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/92742
	* tree-vect-loop.c (vect_fixup_reduc_chain): Do not
	touch the def-type but verify it is consistent with the
	original stmts.

	* gcc.dg/torture/pr92742.c: New testcase.

From-SVN: r278896
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 9b324211554..1d342f4cf10 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2019-12-02  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/92742
+	* tree-vect-loop.c (vect_fixup_reduc_chain): Do not
+	touch the def-type but verify it is consistent with the
+	original stmts.
+
 2019-12-02  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/92712
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 12abe735bbf..03fb4d9ed80 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2019-12-02  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/92742
+	* gcc.dg/torture/pr92742.c: New testcase.
+
 2019-12-02  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/92712
diff --git a/gcc/testsuite/gcc.dg/torture/pr92742.c b/gcc/testsuite/gcc.dg/torture/pr92742.c
new file mode 100644
index 00000000000..59e74c0616b
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr92742.c
@@ -0,0 +1,20 @@
+/* { dg-do compile } */
+/* { dg-additional-options "-ftree-vectorize" } */
+
+unsigned int qw;
+
+int
+rs (int iq, int wg)
+{
+  for (qw = 0; qw < 2; ++qw)
+    {
+    }
+
+  while (iq < 1)
+    {
+      wg *= qw * 2;
+      ++iq;
+    }
+
+  return wg;
+}
diff --git a/gcc/tree-vect-loop.c b/gcc/tree-vect-loop.c
index 77c5a9816e2..83b0e0b8ce9 100644
--- a/gcc/tree-vect-loop.c
+++ b/gcc/tree-vect-loop.c
@@ -643,6 +643,8 @@ vect_fixup_reduc_chain (stmt_vec_info stmt_info)
   do
     {
       stmtp = STMT_VINFO_RELATED_STMT (stmt_info);
+      gcc_checking_assert (STMT_VINFO_DEF_TYPE (stmtp)
+			   == STMT_VINFO_DEF_TYPE (stmt_info));
       REDUC_GROUP_FIRST_ELEMENT (stmtp) = firstp;
       stmt_info = REDUC_GROUP_NEXT_ELEMENT (stmt_info);
       if (stmt_info)
@@ -650,7 +652,6 @@ vect_fixup_reduc_chain (stmt_vec_info stmt_info)
 	  = STMT_VINFO_RELATED_STMT (stmt_info);
     }
   while (stmt_info);
-  STMT_VINFO_DEF_TYPE (stmtp) = vect_reduction_def;
 }
 
 /* Fixup scalar cycles that now have their stmts detected as patterns.  */