re PR tree-optimization/92069 (ice in vect_analyze_scalar_cycles_1, at tree-vect-loop.c:560)

2019-10-14  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/92069
	* tree-vect-loop.c (vect_analyze_scalar_cycles_1): For nested
	cycles do not set vect_nested_cycle on the latch definition.

	* gcc.dg/torture/pr92069.c: New testcase.

From-SVN: r276959

gcc/ChangeLog

+2019-10-14  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/92069
+	* tree-vect-loop.c (vect_analyze_scalar_cycles_1): For nested
+	cycles do not set vect_nested_cycle on the latch definition.
+
 2019-10-14  Richard Sandiford  <richard.sandiford@arm.com>
 
 	* function-abi.h (expr_callee_abi): Declare.

gcc/testsuite/ChangeLog

+2019-10-14  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/92069
+	* gcc.dg/torture/pr92069.c: New testcase.
+
 2019-10-14  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	* g++.dg/cpp0x/constexpr-union5.C: Test location(s) too.

gcc/testsuite/gcc.dg/torture/pr92069.c

+/* { dg-do compile } */
+/* { dg-additional-options "-ftree-vectorize" } */
+
+unsigned int a, c, d;
+double b;
+void e()
+{
+  for (; d; d++)
+    {
+      double f;
+      a = 2;
+      for (; a; a++)
+	{
+	  c = b;
+	  b = f;
+	  f = c;
+	}
+    }
+}

gcc/tree-vect-loop.c

@@ -584,7 +584,6 @@ vect_analyze_scalar_cycles_1 (loop_vec_info loop_vinfo, class loop *loop)
 				     "Detected vectorizable nested cycle.\n");
 
                   STMT_VINFO_DEF_TYPE (stmt_vinfo) = vect_nested_cycle;
-		  STMT_VINFO_DEF_TYPE (reduc_stmt_info) = vect_nested_cycle;
                 }
               else
                 {