re PR tree-optimization/57441 (ICE in gimple-ssa-strength-reduction.c:3447 at -O3)

2013-05-29  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	PR tree-optimization/57441
	* gimple-ssa-strength-reduction.c (analyze_candidates_and_replace):
	Don't limit size of incr_vec to number of candidates.

2013-05-29  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	PR tree-optimization/57441
	* gcc.c-torture/compile/pr57441.c: New.

From-SVN: r199414

gcc/ChangeLog

+2013-05-29  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>
+
+	PR tree-optimization/57441
+	* gimple-ssa-strength-reduction.c (analyze_candidates_and_replace):
+	Don't limit size of incr_vec to number of candidates.
+
 2013-05-29  Steve Ellcey  <sellcey@imgtec.com>
 
 	* config/mips/mti-linux.h (SYSROOT_SUFFIX_SPEC): Add micromips

gcc/gimple-ssa-strength-reduction.c

@@ -3361,7 +3361,6 @@ analyze_candidates_and_replace (void)
 	 less expensive to calculate than the replaced statements.  */
       else
 	{
-	  int length;
 	  enum machine_mode mode;
 	  bool speed;
 
@@ -3372,14 +3371,11 @@ analyze_candidates_and_replace (void)
 
 	  /* If all candidates have already been replaced under other
 	     interpretations, nothing remains to be done.  */
-	  length = count_candidates (c);
-	  if (!length)
+	  if (!count_candidates (c))
 	    continue;
-	  if (length > MAX_INCR_VEC_LEN)
-	    length = MAX_INCR_VEC_LEN;
 
 	  /* Construct an array of increments for this candidate chain.  */
-	  incr_vec = XNEWVEC (incr_info, length);
+	  incr_vec = XNEWVEC (incr_info, MAX_INCR_VEC_LEN);
 	  incr_vec_len = 0;
 	  record_increments (c);
 

gcc/testsuite/ChangeLog

+2013-05-29  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>
+
+	PR tree-optimization/57441
+	* gcc.c-torture/compile/pr57441.c: New.
+
 2013-05-29  Dehao Chen  <dehao@google.com>
 
 	PR testsuite/57413

gcc/testsuite/gcc.c-torture/compile/pr57441.c

+/* PR tree-optimization/57441 */
+
+int a, c, d, *e;
+unsigned char b;
+
+char
+baz (char p1)
+{
+    return p1 * a;
+}
+
+void func_65 ();
+func_1 ()
+{
+    func_65 ();
+    func_65 ();
+}
+
+void
+func_65 ()
+{
+    d = baz (b--);
+    if (*e)
+        b--;
+    c = 0;
+}