re PR tree-optimization/80443 (ICE on valid code at -O2 on x86_64-linux-gnu: in…

re PR tree-optimization/80443 (ICE on valid code at -O2 on x86_64-linux-gnu: in set_value_range, at tree-vrp.c:367)

	PR tree-optimization/80443
	* tree-vrp.c (intersect_ranges): For signed 1-bit precision type,
	instead of adding 1, subtract -1 and similarly instead of subtracting
	1 add -1.

	* gcc.c-torture/compile/pr80443.c: New test.

From-SVN: r246981

gcc/ChangeLog

+2017-04-18  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/80443
+	* tree-vrp.c (intersect_ranges): For signed 1-bit precision type,
+	instead of adding 1, subtract -1 and similarly instead of subtracting
+	1 add -1.
+
 2017-04-18  Richard Sandiford  <richard.sandiford@arm.com>
 
 	PR rtl-optimization/80357

gcc/testsuite/ChangeLog

+2017-04-18  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/80443
+	* gcc.c-torture/compile/pr80443.c: New test.
+
 2017-04-18  Richard Sandiford  <richard.sandiford@arm.com>
 
 	PR rtl-optimization/80357

gcc/testsuite/gcc.c-torture/compile/pr80443.c

+/* PR tree-optimization/80443 */
+
+struct S { int a : 1; } b, c;
+signed char d, e, f;
+
+void
+foo ()
+{ 
+  while (f)
+    { 
+      signed char g = b.a;
+      if (g)
+	b.a = ~(1 + (d || c.a));
+      if (b.a < g && b.a)
+	g = 0;
+      if (b.a > c.a)
+	b.a = g;
+      c.a = e;
+    }
+}

gcc/tree-vrp.c

@@ -8756,20 +8756,32 @@ intersect_ranges (enum value_range_type *vr0type,
 	  /* Choose the right gap if the left one is empty.  */
 	  if (mineq)
 	    {
-	      if (TREE_CODE (vr1max) == INTEGER_CST)
-		*vr0min = int_const_binop (PLUS_EXPR, vr1max,
-					   build_int_cst (TREE_TYPE (vr1max), 1));
-	      else
+	      if (TREE_CODE (vr1max) != INTEGER_CST)
 		*vr0min = vr1max;
+	      else if (TYPE_PRECISION (TREE_TYPE (vr1max)) == 1
+		       && !TYPE_UNSIGNED (TREE_TYPE (vr1max)))
+		*vr0min
+		  = int_const_binop (MINUS_EXPR, vr1max,
+				     build_int_cst (TREE_TYPE (vr1max), -1));
+	      else
+		*vr0min
+		  = int_const_binop (PLUS_EXPR, vr1max,
+				     build_int_cst (TREE_TYPE (vr1max), 1));
 	    }
 	  /* Choose the left gap if the right one is empty.  */
 	  else if (maxeq)
 	    {
-	      if (TREE_CODE (vr1min) == INTEGER_CST)
-		*vr0max = int_const_binop (MINUS_EXPR, vr1min,
-					   build_int_cst (TREE_TYPE (vr1min), 1));
-	      else
+	      if (TREE_CODE (vr1min) != INTEGER_CST)
 		*vr0max = vr1min;
+	      else if (TYPE_PRECISION (TREE_TYPE (vr1min)) == 1
+		       && !TYPE_UNSIGNED (TREE_TYPE (vr1min)))
+		*vr0max
+		  = int_const_binop (PLUS_EXPR, vr1min,
+				     build_int_cst (TREE_TYPE (vr1min), -1));
+	      else
+		*vr0max
+		  = int_const_binop (MINUS_EXPR, vr1min,
+				     build_int_cst (TREE_TYPE (vr1min), 1));
 	    }
 	  /* Choose the anti-range if the range is effectively varying.  */
 	  else if (vrp_val_is_min (*vr0min)
@@ -8811,22 +8823,34 @@ intersect_ranges (enum value_range_type *vr0type,
 	  if (mineq)
 	    {
 	      *vr0type = VR_RANGE;
-	      if (TREE_CODE (*vr0max) == INTEGER_CST)
-		*vr0min = int_const_binop (PLUS_EXPR, *vr0max,
-					   build_int_cst (TREE_TYPE (*vr0max), 1));
-	      else
+	      if (TREE_CODE (*vr0max) != INTEGER_CST)
 		*vr0min = *vr0max;
+	      else if (TYPE_PRECISION (TREE_TYPE (*vr0max)) == 1
+		       && !TYPE_UNSIGNED (TREE_TYPE (*vr0max)))
+		*vr0min
+		  = int_const_binop (MINUS_EXPR, *vr0max,
+				     build_int_cst (TREE_TYPE (*vr0max), -1));
+	      else
+		*vr0min
+		  = int_const_binop (PLUS_EXPR, *vr0max,
+				     build_int_cst (TREE_TYPE (*vr0max), 1));
 	      *vr0max = vr1max;
 	    }
 	  /* Choose the left gap if the right is empty.  */
 	  else if (maxeq)
 	    {
 	      *vr0type = VR_RANGE;
-	      if (TREE_CODE (*vr0min) == INTEGER_CST)
-		*vr0max = int_const_binop (MINUS_EXPR, *vr0min,
-					   build_int_cst (TREE_TYPE (*vr0min), 1));
-	      else
+	      if (TREE_CODE (*vr0min) != INTEGER_CST)
 		*vr0max = *vr0min;
+	      else if (TYPE_PRECISION (TREE_TYPE (*vr0min)) == 1
+		       && !TYPE_UNSIGNED (TREE_TYPE (*vr0min)))
+		*vr0max
+		  = int_const_binop (PLUS_EXPR, *vr0min,
+				     build_int_cst (TREE_TYPE (*vr0min), -1));
+	      else
+		*vr0max
+		  = int_const_binop (MINUS_EXPR, *vr0min,
+				     build_int_cst (TREE_TYPE (*vr0min), 1));
 	      *vr0min = vr1min;
 	    }
 	  /* Choose the anti-range if the range is effectively varying.  */