re PR middle-end/64764 (internal compiler error: in is_value_included_in, at tree-ssa-uninit.c:942)

2015-01-26  Richard Biener  <rguenther@suse.de>

	PR middle-end/64764
	* tree-ssa-uninit.c (is_pred_expr_subset_of): Handle
	combining two BIT_AND_EXPR predicates.

	* gcc.dg/uninit-19.c: New testcase.

From-SVN: r220111

gcc/ChangeLog

+2015-01-26  Richard Biener  <rguenther@suse.de>
+
+	PR middle-end/64764
+	* tree-ssa-uninit.c (is_pred_expr_subset_of): Handle
+	combining two BIT_AND_EXPR predicates.
+
 2015-01-26  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR bootstrap/64754
 	* tree-ssa-structalias.c (new_var_info): Initialize ruid.
----
+
 2015-01-26  Terry Guo  <terry.guo@arm.com>
 
 	* config/arm/arm.c (arm_file_start): Update the assignment of

gcc/testsuite/ChangeLog

+2015-01-26  Richard Biener  <rguenther@suse.de>
+
+	PR middle-end/64764
+	* gcc.dg/uninit-19.c: New testcase.
+
 2015-01-26  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
 	* lib/target-supports.exp (check_effective_target_vect64): Add

gcc/testsuite/gcc.dg/uninit-19.c

+/* { dg-do compile } */
+/* { dg-options "-O -Wuninitialized" } */
+
+int a, l, m;
+float *b;
+float c, d, e, g, h;
+unsigned char i, k;
+void
+fn1 (int p1, float *f1, float *f2, float *f3, unsigned char *c1, float *f4,
+     unsigned char *c2, float *p10)
+{
+  if (p1 & 8)
+    b[3] = p10[a];  /* { dg-warning "may be used uninitialized" } */
+}
+
+void
+fn2 ()
+{
+  float *n;
+  if (l & 6)
+    n = &c + m;
+  fn1 (l, &d, &e, &g, &i, &h, &k, n);
+}

gcc/tree-ssa-uninit.c

@@ -1377,7 +1377,8 @@ is_pred_expr_subset_of (pred_info expr1, pred_info expr2)
   if (expr2.invert)
     code2 = invert_tree_comparison (code2, false);
 
-  if (code1 == EQ_EXPR && code2 == BIT_AND_EXPR)
+  if ((code1 == EQ_EXPR || code1 == BIT_AND_EXPR)
+      && code2 == BIT_AND_EXPR)
     return wi::eq_p (expr1.pred_rhs,
 		     wi::bit_and (expr1.pred_rhs, expr2.pred_rhs));