re PR tree-optimization/54684 (bootstrap broken with --disable-checking)

2012-09-24  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/54684
	* tree-ssa-ccp.c (optimize_unreachable): Properly update stmts.

	* g++.dg/torture/pr54684.C: New testcase.

From-SVN: r191667

4 files changed, 73 insertions, 0 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index efa4676..484df36 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2012-09-24  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/54684
+	* tree-ssa-ccp.c (optimize_unreachable): Properly update stmts.
+
 2012-09-24  Marc Glisse  <marc.glisse@inria.fr>
 
 	* tree-ssa-forwprop.c: Include tree-ssa-propagate.h.
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 6d610e5..a0b2bdf 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2012-09-24  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/54684
+	* g++.dg/torture/pr54684.C: New testcase.
+
 2012-09-24  Marc Glisse  <marc.glisse@inria.fr>
 
 	* gcc.dg/tree-ssa/forwprop-23.c: New testcase.
diff --git a/gcc/testsuite/g++.dg/torture/pr54684.C b/gcc/testsuite/g++.dg/torture/pr54684.C
new file mode 100644
index 0000000..40c47f3
--- /dev/null
+++ b/gcc/testsuite/g++.dg/torture/pr54684.C
@@ -0,0 +1,62 @@
+// { dg-do compile }
+
+typedef union tree_node *tree;
+typedef union gimple_statement_d *gimple;
+struct vec_prefix { unsigned num_; };
+template<typename T> struct vec_t {
+    unsigned length (void) const;
+    T &operator[] (unsigned);
+    vec_prefix prefix_;
+    T vec_[1];
+};
+template<typename T> inline unsigned vec_t<T>::length (void) const {
+    return prefix_.num_;
+}
+template<typename T> T & vec_t<T>::operator[] (unsigned ix) {
+    ((void)(__builtin_expect(!(ix < prefix_.num_), 0) ? __builtin_unreachable(), 0 : 0));
+    return vec_[ix];
+}
+enum tree_code { PARM_DECL };
+struct tree_base {
+    enum tree_code code : 16;
+    unsigned default_def_flag : 1;
+};
+union tree_node {
+    struct tree_base base;
+};
+struct ipa_param_descriptor {
+    tree decl;
+    unsigned used : 1;
+};
+typedef struct ipa_param_descriptor ipa_param_descriptor_t;
+struct ipa_node_params {
+    vec_t<ipa_param_descriptor_t> *descriptors;
+};
+static inline int ipa_get_param_count (struct ipa_node_params *info) {
+    return ((info->descriptors) ? (info->descriptors)->length () : 0);
+}
+static inline tree ipa_get_param (struct ipa_node_params *info, int i) {
+    return ((*(info->descriptors))[i]).decl;
+}
+static inline void ipa_set_param_used (struct ipa_node_params *info, int i, bool val) {
+    ((*(info->descriptors))[i]).used = val;
+}
+int ipa_get_param_decl_index (struct ipa_node_params *info, tree ptree)
+{
+  int i, count;
+  count = ipa_get_param_count (info);
+  for (i = 0; i < count; i++)
+    if (ipa_get_param (info, i) == ptree)       return i;
+  return -1;
+}
+bool visit_ref_for_mod_analysis (gimple stmt __attribute__ ((__unused__)),
+				 tree op, void *data)
+{
+  struct ipa_node_params *info = (struct ipa_node_params *) data;
+  if (op && ((enum tree_code) (op)->base.code) == PARM_DECL)
+    {
+      int index = ipa_get_param_decl_index (info, op);
+      ((void)(__builtin_expect(!(index >= 0), 0) ? __builtin_unreachable(), 0 : 0));
+      ipa_set_param_used (info, index, true);
+    }
+}
diff --git a/gcc/tree-ssa-ccp.c b/gcc/tree-ssa-ccp.c
index bf68474..49a4c6f 100644
--- a/gcc/tree-ssa-ccp.c
+++ b/gcc/tree-ssa-ccp.c
@@ -2355,6 +2355,7 @@ optimize_unreachable (gimple_stmt_iterator i)
 	    gimple_cond_make_true (stmt);
 	  else
 	    gcc_unreachable ();
+	  update_stmt (stmt);
 	}
       else
 	{