re PR tree-optimization/32821 (tree-if-conv:combine_blocks with…

re PR tree-optimization/32821 (tree-if-conv:combine_blocks with -ftree-dump-tree-all-details fails on ICE in compilation: segfault)

	PR tree-optimization/32821
	* tree_if_conv.c (combine_blocks): Use alloc_stmt_list instead of
	NULL in the call to set_bb_stmt_list.

testsuite/ChangeLog:

	PR tree-optimization/32821
	* gcc.dg/tree-ssa/pr32821.c: New file.

From-SVN: r128235

gcc/ChangeLog

+2007-09-07  Richard Guenther  <rguenther@suse.de>
+	    Uros Bizjak  <ubizjak@gmail.com>
+
+	PR tree-optimization/32821
+	* tree_if_conv.c (combine_blocks): Use alloc_stmt_list instead of
+	NULL in the call to set_bb_stmt_list.
+
 2007-09-07  Richard Sandiford  <richard@codesourcery.com>
 
 	* config/mips/mips.c (build_mips16_call_stub): Emit all direct

gcc/testsuite/ChangeLog

+2007-09-07 Uros Bizjak <ubizjak@gmail.com>
+
+	PR tree-optimization/32821
+	* gcc.dg/tree-ssa/pr32821.c: New file.
+
 2007-09-07  Richard Sandiford  <richard@codesourcery.com>
 
 	* gcc.dg/attr-alias-3.c: Use real asm for MIPS.

gcc/testsuite/gcc.dg/tree-ssa/pr32821.c

+/* { dg-do compile } */
+/* { dg-options "-O2 -ftree-vectorize -fdump-tree-ifcvt-details" } */
+
+void
+main1 (int *arr, int n, int a, int b)
+{
+  int i;
+  for (i = 0; i < n; i++)
+    {
+      int m = arr[i];
+      arr[i] = (m < a ? m - a : b);
+    }
+}
+
+/* { dg-final { cleanup-tree-dump "ifcvt" } } */

gcc/tree-if-conv.c

@@ -985,7 +985,7 @@ combine_blocks (struct loop *loop)
       /* Update stmt list.  */
       last = tsi_last (bb_stmt_list (merge_target_bb));
       tsi_link_after (&last, bb_stmt_list (bb), TSI_NEW_STMT);
-      set_bb_stmt_list (bb, NULL);
+      set_bb_stmt_list (bb, alloc_stmt_list());
 
       delete_basic_block (bb);
     }