re PR tree-optimization/61482 (ICE in set_value_range, at tree-vrp.c:453 when…

re PR tree-optimization/61482 (ICE in set_value_range, at tree-vrp.c:453 when compiling Firefox ESR 24)

2014-06-16  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/61482
	* tree-vrp.c (adjust_range_with_scev): Avoid setting of
	[-INF(OVF), +INF(OVF)] range.

	* g++.dg/torture/pr61482.C: New testcase.

From-SVN: r211709

gcc/ChangeLog

+2014-06-16  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/61482
+	* tree-vrp.c (adjust_range_with_scev): Avoid setting of
+	[-INF(OVF), +INF(OVF)] range.
+
 2014-06-16  Ganesh Gopalasubramanian <Ganesh.Gopalasubramanian@amd.com>
 
 	* config/i386/i386.c (ix86_expand_sse2_mulvxdi3): Issue

gcc/testsuite/ChangeLog

+2014-06-16  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/61482
+	* g++.dg/torture/pr61482.C: New testcase.
+
 2014-06-16 Ganesh Gopalasubramanian  <Ganesh.Gopalasubramanian@amd.com>
 
 	* gcc.target/i386/xop-imul64-vector.c: Remove the check for

gcc/testsuite/g++.dg/torture/pr61482.C

+// { dg-do compile }
+
+class A
+{
+public:
+    int m_fn1 ();
+};
+class B
+{
+  void m_fn2 (const int &p1);
+  A mThebesLayerDataStack;
+};
+int b, c;
+void B::m_fn2 (const int &p1)
+{
+  if (c && b)
+    {
+      int i;
+      i = mThebesLayerDataStack.m_fn1 ();
+      for (; i >= 0;)
+	{
+	  ++i;
+	  break;
+	}
+      --i;
+      for (; i >= 0; --i)
+	mThebesLayerDataStack.m_fn1 ();
+    }
+}

gcc/tree-vrp.c

@@ -3892,15 +3892,6 @@ adjust_range_with_scev (value_range_t *vr, struct loop *loop,
 	max = init;
       else
 	min = init;
-
-      /* If we would create an invalid range, then just assume we
-	 know absolutely nothing.  This may be over-conservative,
-	 but it's clearly safe, and should happen only in unreachable
-         parts of code, or for invalid programs.  */
-      if (compare_values (min, max) == 1)
-	return;
-
-      set_value_range (vr, VR_RANGE, min, max, vr->equiv);
     }
   else if (vr->type == VR_RANGE)
     {
@@ -3933,16 +3924,20 @@ adjust_range_with_scev (value_range_t *vr, struct loop *loop,
 	      || compare_values (tmax, max) == -1)
 	    max = tmax;
 	}
+    }
+  else
+    return;
 
   /* If we just created an invalid range with the minimum
      greater than the maximum, we fail conservatively.
      This should happen only in unreachable
      parts of code, or for invalid programs.  */
-      if (compare_values (min, max) == 1)
+  if (compare_values (min, max) == 1
+      || (is_negative_overflow_infinity (min)
+	  && is_positive_overflow_infinity (max)))
     return;
 
   set_value_range (vr, VR_RANGE, min, max, vr->equiv);
-    }
 }