patch to fix PR56184

Index: ira.c
===================================================================
--- ira.c	(revision 196018)
+++ ira.c	(working copy)
@@ -419,6 +419,11 @@  int ira_move_loops_num, ira_additional_j
 
 HARD_REG_SET eliminable_regset;
 
+/* Value of max_reg_num () before IRA work start.  This value helps
+   us to recognize a situation when new pseudos were created during
+   IRA work.  */
+static int max_regno_before_ira;
+
 /* Temporary hard reg set used for a different calculation.  */
 static HARD_REG_SET temp_hard_regset;
 
@@ -2264,11 +2269,11 @@  ira_update_equiv_info_by_shuffle_insn (i
 static void
 fix_reg_equiv_init (void)
 {
-  unsigned int max_regno = max_reg_num ();
+  int max_regno = max_reg_num ();
   int i, new_regno, max;
   rtx x, prev, next, insn, set;
 
-  if (vec_safe_length (reg_equivs) < max_regno)
+  if (max_regno_before_ira < max_regno)
     {
       max = vec_safe_length (reg_equivs);
       grow_reg_equivs ();
@@ -4350,7 +4355,7 @@  static void
 ira (FILE *f)
 {
   bool loops_p;
-  int max_regno_before_ira, ira_max_point_before_emit;
+  int ira_max_point_before_emit;
   int rebuild_p;
   bool saved_flag_caller_saves = flag_caller_saves;
   enum ira_region saved_flag_ira_region = flag_ira_region;
Index: testsuite/gcc.target/arm/pr56184.C
===================================================================
--- testsuite/gcc.target/arm/pr56184.C	(revision 0)
+++ testsuite/gcc.target/arm/pr56184.C	(working copy)
@@ -0,0 +1,257 @@ 
+/* { dg-do compile } */
+/* { dg-options "-O2 -mthumb -march=armv7-a -mfpu=neon -mfloat-abi=softfp -mtune=cortex-a9 -fno-section-anchors" } */
+
+typedef unsigned int size_t;
+__extension__ typedef int __intptr_t;
+typedef __intptr_t intptr_t;
+typedef union tree_node *tree;
+typedef const union tree_node *const_tree;
+extern void *ggc_internal_cleared_alloc_stat (size_t )
+  __attribute__ ((__malloc__));
+enum tree_code {
+TREE_LIST=2,
+FUNCTION_DECL,
+MAX_TREE_CODES=254
+};
+extern unsigned char tree_contains_struct[MAX_TREE_CODES][64];
+struct tree_base {
+  enum tree_code code : 16;
+};
+struct tree_common {
+  tree chain;
+};
+enum tree_node_structure_enum {
+TS_COMMON,
+TS_DECL_COMMON,
+};
+extern void tree_contains_struct_check_failed (const_tree,
+            const enum tree_node_structure_enum,
+            const char *, int, const char *)
+  __attribute__ ((__noreturn__));
+extern void tree_check_failed (const_tree, const char *, int, const char *,
+          ...) __attribute__ ((__noreturn__));
+struct tree_list {
+  tree value;
+};
+struct tree_decl_common {
+  tree initial;
+};
+struct tree_function_decl {
+  struct function *f;
+};
+union
+                                                         tree_node {
+  struct tree_base base;
+  struct tree_common common;
+  struct tree_decl_common decl_common;
+  struct tree_function_decl function_decl;
+  struct tree_list list;
+};
+inline tree
+tree_check (tree __t, const char *__f, int __l, const char *__g, enum tree_code __c)
+{
+  if (((enum tree_code) (__t)->base.code) != __c)
+    tree_check_failed (__t, __f, __l, __g, __c, 0);
+}
+inline tree
+contains_struct_check (tree __t, const enum tree_node_structure_enum __s,
+                       const char *__f, int __l, const char *__g)
+{
+  if (tree_contains_struct[((enum tree_code) (__t)->base.code)][__s] != 1)
+      tree_contains_struct_check_failed (__t, __s, __f, __l, __g);
+}
+struct function {
+  tree static_chain_decl;
+};
+enum gimple_code {
+    LAST_AND_UNUSED_GIMPLE_CODE
+};
+struct eh_catch_d
+{
+  struct eh_catch_d *next_catch;
+  struct eh_catch_d *prev_catch;
+  tree type_list;
+  tree filter_list;
+  tree label;
+};
+struct eh_region_d
+{
+  struct eh_region_d *outer;
+  struct eh_region_d *inner;
+  int index;
+  union eh_region_u {
+    struct eh_region_u_try {
+      struct eh_catch_d *first_catch;
+    } eh_try;
+  } u;
+};
+typedef struct eh_catch_d *eh_catch;
+typedef struct eh_region_d *eh_region;
+extern void add_type_for_runtime (tree);
+enum LTO_tags
+{
+  LTO_null = 0,
+  LTO_bb0 = 1 + MAX_TREE_CODES + LAST_AND_UNUSED_GIMPLE_CODE,
+  LTO_ert_cleanup,
+  LTO_NUM_TAGS
+};
+enum lto_section_type
+{
+  LTO_section_function_body,
+};
+struct lto_input_block
+{
+  const char *data;
+  unsigned int p;
+  unsigned int len;
+};
+extern void lto_section_overrun (struct lto_input_block *) __attribute__ ((__noreturn__));
+extern void lto_value_range_error (const char *,
+       long long, long long,
+       long long) __attribute__ ((__noreturn__));
+long long streamer_read_hwi (struct lto_input_block *);
+static inline unsigned char
+streamer_read_uchar (struct lto_input_block *ib)
+{
+  if (ib->p >= ib->len)
+    lto_section_overrun (ib);
+  return (ib->data[ib->p++]);
+}
+static inline long long
+streamer_read_hwi_in_range (struct lto_input_block *ib,
+     const char *purpose,
+     long long min,
+     long long max)
+{
+  long long range = max - min;
+  long long val = streamer_read_uchar (ib);
+  if (range >= 0xff)
+    val |= ((long long)streamer_read_uchar (ib)) << 8;
+  if (val < min || val > max)
+    lto_value_range_error (purpose, val, min, max);
+  return val;
+}
+static inline enum LTO_tags
+streamer_read_record_start (struct lto_input_block *ib)
+{
+  return (enum LTO_tags)streamer_read_hwi_in_range ((ib), "LTO_tags", 0, (int)(LTO_NUM_TAGS) - 1);
+}
+struct streamer_hooks {
+  tree (*read_tree) (struct lto_input_block *, struct data_in *);
+};
+extern struct streamer_hooks streamer_hooks;
+static struct eh_catch_d *
+lto_input_eh_catch_list (struct lto_input_block *ib, struct data_in *data_in,
+    eh_catch *last_p)
+{
+  eh_catch first;
+  enum LTO_tags tag;
+  *last_p = first = __null;
+  tag = streamer_read_record_start (ib);
+  while (tag)
+    {
+      tree list;
+      eh_catch n;
+      n = ((struct eh_catch_d *)(ggc_internal_cleared_alloc_stat (sizeof (struct eh_catch_d) )));
+      n->type_list = streamer_hooks.read_tree(ib, data_in);
+      n->filter_list = streamer_hooks.read_tree(ib, data_in);
+      n->label = streamer_hooks.read_tree(ib, data_in);
+      for (list = n->filter_list; list; list = ((contains_struct_check ((list), (TS_COMMON), "../../../gcc-4.8~svn195526/gcc/lto-streamer-in.c", 275, __FUNCTION__))->common.chain))
+ add_type_for_runtime (((tree_check ((list), "../../../gcc-4.8~svn195526/gcc/lto-streamer-in.c", 276, __FUNCTION__, (TREE_LIST)))->list.value));
+      if (*last_p)
+ (*last_p)->next_catch = n;
+      n->prev_catch = *last_p;
+      *last_p = n;
+      if (first == __null)
+ first = n;
+      tag = streamer_read_record_start (ib);
+    }
+  return first;
+}
+static eh_region
+input_eh_region (struct lto_input_block *ib, struct data_in *data_in, int ix)
+{
+  enum LTO_tags tag;
+  eh_region r;
+  tag = streamer_read_record_start (ib);
+  if (tag == LTO_null)
+    return __null;
+  r = ((struct eh_region_d *)(ggc_internal_cleared_alloc_stat (sizeof (struct eh_region_d) )));
+  r->index = streamer_read_hwi (ib);
+  r->outer = (eh_region) (intptr_t) streamer_read_hwi (ib);
+  r->inner = (eh_region) (intptr_t) streamer_read_hwi (ib);
+  switch (tag)
+    {
+      case LTO_ert_cleanup:
+ {
+   struct eh_catch_d *last_catch;
+   r->u.eh_try.first_catch = lto_input_eh_catch_list (ib, data_in,
+            &last_catch);
+ }
+ {
+   tree l;
+     add_type_for_runtime (((tree_check ((l), "../../../gcc-4.8~svn195526/gcc/lto-streamer-in.c", 346, __FUNCTION__, (TREE_LIST)))->list.value));
+ }
+    }
+}
+static void
+input_eh_regions (struct lto_input_block *ib, struct data_in *data_in,
+    struct function *fn)
+{
+  long long i, root_region, len;
+  enum LTO_tags tag;
+  tag = streamer_read_record_start (ib);
+  if (tag == LTO_null)
+    return;
+  len = streamer_read_hwi (ib);
+  if (len > 0)
+    {
+      for (i = 0; i < len; i++)
+ {
+   eh_region r = input_eh_region (ib, data_in, i);
+ }
+    }
+}
+static void
+input_ssa_names (struct lto_input_block *ib, struct data_in *data_in,
+   struct function *fn)
+{
+  unsigned int i, size;
+  while (i)
+    {
+    }
+}
+static void
+input_struct_function_base (struct function *fn, struct data_in *data_in,
+                            struct lto_input_block *ib)
+{
+  fn->static_chain_decl = streamer_hooks.read_tree(ib, data_in);
+}
+static void
+input_function (tree fn_decl, struct data_in *data_in,
+  struct lto_input_block *ib)
+{
+  struct function *fn;
+  enum LTO_tags tag;
+  fn = ((tree_check ((fn_decl), "../../../gcc-4.8~svn195526/gcc/lto-streamer-in.c", 807, __FUNCTION__, (FUNCTION_DECL)))->function_decl.f);
+  tag = streamer_read_record_start (ib);
+  input_struct_function_base (fn, data_in, ib);
+  input_ssa_names (ib, data_in, fn);
+  input_eh_regions (ib, data_in, fn);
+  ((contains_struct_check ((fn_decl), (TS_DECL_COMMON), "../../../gcc-4.8~svn195526/gcc/lto-streamer-in.c", 823, __FUNCTION__))->decl_common.initial) = streamer_hooks.read_tree(ib, data_in);
+}
+static void
+lto_read_body (struct lto_file_decl_data *file_data, tree fn_decl,
+        const char *data, enum lto_section_type section_type)
+{
+  struct data_in *data_in;
+  struct lto_input_block ib_main;
+  input_function (fn_decl, data_in, &ib_main);
+}
+void
+lto_input_function_body (struct lto_file_decl_data *file_data,
+    tree fn_decl, const char *data)
+{
+  lto_read_body (file_data, fn_decl, data, LTO_section_function_body);
+}
+