X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fir%2Firmode.c;h=96c00291d0755a7efbda075aff60733185305c40;hb=ecf4d3aa8c62642835511e1f7b8a329078161fe1;hp=b5a47da9c82950c48bda09406a2b317e9133dcce;hpb=abf8cf674736404387146a85cede74f390af876d;p=libfirm

diff --git a/ir/ir/irmode.c b/ir/ir/irmode.c
index b5a47da9c..96c00291d 100644
--- a/ir/ir/irmode.c
+++ b/ir/ir/irmode.c
@@ -1,23 +1,32 @@
-/* Copyright (C) 1998 - 2000 by Universitaet Karlsruhe
-** All rights reserved.
-**
-** Authors: Martin Trapp, Christian Schaefer
-**
-*/
-
-/* $Id$ */
-
+/*
+ * Project:     libFIRM
+ * File name:   ir/ir/irmode.c
+ * Purpose:     Data modes of operations.
+ * Author:      Martin Trapp, Christian Schaefer
+ * Modified by: Goetz Lindenmaier, Mathias Heil
+ * Created:
+ * CVS-ID:      $Id$
+ * Copyright:   (c) 1998-2003 Universität Karlsruhe
+ * Licence:     This file protected by GPL -  GNU GENERAL PUBLIC LICENSE.
+ */
 #ifdef HAVE_CONFIG_H
-# include <config.h>
+# include "config.h"
 #endif
 
-# include "irmode_t.h"
-# include "ident.h"
+#ifdef HAVE_STDLIB_H
 # include <stdlib.h>
-# include <stddef.h>
+#endif
+#ifdef HAVE_STRING_H
 # include <string.h>
-# include "tv.h"
-# include "array.h"
+#endif
+
+# include <stddef.h>
+
+# include "irmode_t.h"
+# include "ident.h"
+# include "tv_t.h"
+# include "obst.h"
+# include "irhooks.h"
 
 #if 0
 static long long count = 0;
@@ -32,12 +41,7 @@ static long long count = 0;
 
 
 /** dynamic array to hold all modes */
-static ir_mode * modes;
-/* dynamic arrays to hold special modes' values */
-static tarval** modes_min;
-static tarval** modes_max;
-static tarval** modes_null;
-static tarval** modes_one;
+static struct obstack modes;
 
 /** number of defined modes */
 static int num_modes;
@@ -49,31 +53,69 @@ static int num_modes;
 /**
  * Compare modes that don't need to have their code field
  * correctly set
- */
-static int modes_are_equal(const ir_mode *m, const ir_mode *n)
+ *
+ * TODO: Add other fields
+ **/
+INLINE static int modes_are_equal(const ir_mode *m, const ir_mode *n)
 {
   if (m == n) return 1;
-  if ( (m->sort == n->sort) && (m->size == n->size) &&
-      (m->align == n->align) && (m->sign == n->sign) &&
-      (m->name == n->name)
-     )
+  if (m->sort         == n->sort &&
+      m->arithmetic   == n->arithmetic &&
+      m->size         == n->size &&
+      m->sign         == n->sign  &&
+      m->modulo_shift == n->modulo_shift &&
+      m->vector_elem  == n->vector_elem)
     return 1;
 
   return 0;
 }
 
+/*
+ * calculates the next obstack address
+ */
+static void *next_obstack_adr(struct obstack *o, void *p, size_t s)
+{
+  PTR_INT_TYPE adr = __PTR_TO_INT((char *)p);
+  int mask = obstack_alignment_mask(o);
+
+  adr += s + mask;
+
+  return __INT_TO_PTR(adr & ~mask);
+}
+
 /**
- * searches the modes array for the given mode and returns
+ * searches the modes obstack for the given mode and returns
  * a pointer on an equal mode already in the array, NULL if
  * none found
  */
-static ir_mode *find_mode(ir_mode *m)
+static ir_mode *find_mode(const ir_mode *m)
 {
-  int i;
+  ir_mode *n, *nn;
+  struct _obstack_chunk	*p;
+
+  p  = modes.chunk;
+  n  = (ir_mode *)p->contents;
+  nn = next_obstack_adr(&modes, n, sizeof(*n));
+  for (; (char *)nn <= modes.next_free;) {
+    assert(is_mode(n));
+    if (modes_are_equal(n, m))
+      return n;
+
+    n  = nn;
+    nn = next_obstack_adr(&modes, n, sizeof(*n));
+  }
 
-  for (i = 0; i < num_modes; i++)
-  {
-    if (modes_are_equal(m, &modes[i])) return &modes[i];
+  for (p = p->prev; p; p = p->prev) {
+    n  = (ir_mode *)p->contents;
+    nn = next_obstack_adr(&modes, n, sizeof(*n));
+    for (; (char *)nn < p->limit;) {
+      assert(is_mode(n));
+      if (modes_are_equal(n, m))
+	return n;
+
+      n  = nn;
+      nn = next_obstack_adr(&modes, n, sizeof(*n));
+    }
   }
 
   return NULL;
@@ -84,11 +126,46 @@ static ir_mode *find_mode(ir_mode *m)
  */
 static void set_mode_values(ir_mode* mode)
 {
-  modes_min[get_mode_modecode(mode)] = get_tarval_min(mode);
-  modes_max[get_mode_modecode(mode)] = get_tarval_max(mode);
-  modes_null[get_mode_modecode(mode)] = get_tarval_null(mode);
-  modes_one[get_mode_modecode(mode)] = get_tarval_one(mode);
+  switch (get_mode_sort(mode))
+  {
+    case irms_character:
+    case irms_int_number:
+    case irms_float_number:
+      mode->min  = get_tarval_min(mode);
+      mode->max  = get_tarval_max(mode);
+      mode->null = get_tarval_null(mode);
+      mode->one  = get_tarval_one(mode);
+      mode->minus_one = get_tarval_minus_one(mode);
+      break;
+
+    case irms_internal_boolean:
+      mode->min  = tarval_b_false;
+      mode->max  = tarval_b_true;
+      mode->null = tarval_b_false;
+      mode->one  = tarval_b_true;
+      mode->minus_one = tarval_bad;
+      break;
+
+    case irms_reference:
+      mode->min  = tarval_bad;
+      mode->max  = tarval_bad;
+      mode->null = get_tarval_null(mode);
+      mode->one  = tarval_bad;
+      mode->minus_one = tarval_bad;
+      break;
+
+    case irms_auxiliary:
+    case irms_memory:
+    case irms_control_flow:
+      mode->min  = tarval_bad;
+      mode->max  = tarval_bad;
+      mode->null = tarval_bad;
+      mode->one  = tarval_bad;
+      mode->minus_one = tarval_bad;
+      break;
+  }
 }
+
 /* * *
  * globals defined in irmode.h
  * * */
@@ -100,6 +177,8 @@ ir_mode *mode_T;
 ir_mode *mode_X;
 ir_mode *mode_M;
 ir_mode *mode_BB;
+ir_mode *mode_ANY;
+ir_mode *mode_BAD;
 
 /* predefined numerical modes: */
 ir_mode *mode_F;    /* float */
@@ -120,6 +199,9 @@ ir_mode *mode_U;
 ir_mode *mode_b;
 ir_mode *mode_P;
 
+/* machine specific modes */
+ir_mode *mode_P_mach;	/* machine specific pointer mode */
+
 /* * *
  * functions defined in irmode.h
  * * */
@@ -144,135 +226,228 @@ INLINE ir_mode *get_modeP(void) { ANNOUNCE(); return mode_P; }
 INLINE ir_mode *get_modeX(void) { ANNOUNCE(); return mode_X; }
 INLINE ir_mode *get_modeM(void) { ANNOUNCE(); return mode_M; }
 INLINE ir_mode *get_modeBB(void) { ANNOUNCE(); return mode_BB; }
+INLINE ir_mode *get_modeANY(void) { ANNOUNCE(); return mode_ANY; }
+INLINE ir_mode *get_modeBAD(void) { ANNOUNCE(); return mode_BAD; }
+
+
+ir_mode *(get_modeP_mach)(void) {
+  ANNOUNCE();
+  return _get_modeP_mach();
+}
+
+void (set_modeP_mach)(ir_mode *p) {
+  ANNOUNCE();
+  _set_modeP_mach(p);
+}
 
 /**
- * Registers a new mode if not defined yet, else returns
- * the "equivalent" one.
+ * Registers a new mode.
+ *
+ * @param new_mode  The new mode template.
  */
-static ir_mode *register_mode(ir_mode* new_mode)
+static ir_mode *register_mode(const ir_mode *new_mode)
 {
-  ir_mode *mode;
+  ir_mode *mode = NULL;
 
   ANNOUNCE();
   assert(new_mode);
 
-  /* first check if there already is a matching mode */
-  mode = find_mode(new_mode);
-  if (mode) return mode;
+  /* copy mode struct to modes array */
+  mode = (ir_mode *)obstack_copy(&modes, new_mode, sizeof(*mode));
+
+  mode->kind = k_ir_mode;
+  if (num_modes >= irm_max) mode->code = num_modes;
+  num_modes++;
+
+  set_mode_values(mode);
+
+  return mode;
+}
+
+/*
+ * Creates a new mode.
+ */
+ir_mode *new_ir_mode(const char *name, mode_sort sort, int bit_size, int sign,
+		     mode_arithmetic arithmetic, unsigned int modulo_shift )
+{
+  ir_mode mode_tmpl;
+  ir_mode *mode = NULL;
+
+  mode_tmpl.name         = new_id_from_str(name);
+  mode_tmpl.sort         = sort;
+  mode_tmpl.size         = bit_size;
+  mode_tmpl.sign         = sign ? 1 : 0;
+  mode_tmpl.modulo_shift = (mode_tmpl.sort == irms_int_number) ? modulo_shift : 0;
+  mode_tmpl.vector_elem  = 1;
+  mode_tmpl.arithmetic   = arithmetic;
+  mode_tmpl.link         = NULL;
+  mode_tmpl.tv_priv      = NULL;
+
+  mode = find_mode(&mode_tmpl);
+  if (mode) {
+    hook_new_mode(&mode_tmpl, mode);
+    return mode;
+  }
 
   /* sanity checks */
-  switch (new_mode->sort)
+  switch (sort)
   {
     case irms_auxiliary:
+    case irms_control_flow:
+    case irms_memory:
     case irms_internal_boolean:
       assert(0 && "internal modes cannot be user defined");
-      return NULL;
       break;
 
     case irms_float_number:
-      assert(0 && "not yet implemented");
-      return NULL;
-      break;
-
     case irms_int_number:
     case irms_reference:
     case irms_character:
-      break;
-
-    default:
-      assert(0 && "wrong mode sort");
-      return NULL;
+      mode = register_mode(&mode_tmpl);
   }
-
-  /* copy mode struct to modes array */
-  ARR_EXTEND(ir_mode, modes, 1);
-  ARR_EXTEND(tarval*, modes_min, 1);
-  ARR_EXTEND(tarval*, modes_max, 1);
-  ARR_EXTEND(tarval*, modes_null, 1);
-  ARR_EXTEND(tarval*, modes_one, 1);
-  mode = &modes[num_modes];
-
-  memcpy(mode, new_mode, sizeof(ir_mode));
-  mode->code = num_modes;
-  num_modes++;
-
-  set_mode_values(mode);
-
+  hook_new_mode(&mode_tmpl, mode);
   return mode;
 }
 
 /*
- * Creates a new mode.
+ * Creates a new vector mode.
  */
-ir_mode *new_ir_mode(const char *name, mode_sort sort, int bit_size, int align, int sign)
+ir_mode *new_ir_vector_mode(const char *name, mode_sort sort, int bit_size, unsigned num_of_elem, int sign,
+		     mode_arithmetic arithmetic, unsigned int modulo_shift )
 {
   ir_mode mode_tmpl;
+  ir_mode *mode = NULL;
+
+  mode_tmpl.name         = new_id_from_str(name);
+  mode_tmpl.sort         = sort;
+  mode_tmpl.size         = bit_size * num_of_elem;
+  mode_tmpl.sign         = sign ? 1 : 0;
+  mode_tmpl.modulo_shift = (mode_tmpl.sort == irms_int_number) ? modulo_shift : 0;
+  mode_tmpl.vector_elem  = num_of_elem;
+  mode_tmpl.arithmetic   = arithmetic;
+  mode_tmpl.link         = NULL;
+  mode_tmpl.tv_priv      = NULL;
+
+  mode = find_mode(&mode_tmpl);
+  if (mode) {
+    hook_new_mode(&mode_tmpl, mode);
+    return mode;
+  }
+
+  if (num_of_elem <= 1) {
+    assert(0 && "vector modes should have at least 2 elements");
+    hook_new_mode(&mode_tmpl, mode);
+    return mode;
+  }
+
+  /* sanity checks */
+  switch (sort)
+  {
+    case irms_auxiliary:
+    case irms_control_flow:
+    case irms_memory:
+    case irms_internal_boolean:
+      assert(0 && "internal modes cannot be user defined");
+      break;
+
+    case irms_reference:
+    case irms_character:
+      assert(0 && "only integer and floating point modes can be vectorized");
+      break;
 
-  mode_tmpl.name    = new_id_from_str(name);
-  mode_tmpl.sort    = sort;
-  mode_tmpl.size    = bit_size;
-  mode_tmpl.align   = align;
-  mode_tmpl.sign    = sign ? 1 : 0;
-  mode_tmpl.tv_priv = NULL;
+    case irms_float_number:
+      assert(0 && "not yet implemented");
+      break;
 
-  return register_mode(&mode_tmpl);
+    case irms_int_number:
+      mode = register_mode(&mode_tmpl);
+  }
+  hook_new_mode(&mode_tmpl, mode);
+  return mode;
 }
 
 /* Functions for the direct access to all attributes od a ir_mode */
 modecode
-get_mode_modecode(const ir_mode *mode)
+(get_mode_modecode)(const ir_mode *mode)
 {
   ANNOUNCE();
-  return mode->code;
+  return _get_mode_modecode(mode);
 }
 
 ident *
-get_mode_ident(const ir_mode *mode)
+(get_mode_ident)(const ir_mode *mode)
 {
   ANNOUNCE();
-  return mode->name;
+  return _get_mode_ident(mode);
 }
 
 const char *
 get_mode_name(const ir_mode *mode)
 {
   ANNOUNCE();
-  return id_to_str(mode->name);
+  return get_id_str(mode->name);
 }
 
 mode_sort
-get_mode_sort(const ir_mode* mode)
+(get_mode_sort)(const ir_mode* mode)
 {
   ANNOUNCE();
-  return mode->sort;
+  return _get_mode_sort(mode);
 }
 
-INLINE int
-get_mode_size_bits(const ir_mode *mode)
+int
+(get_mode_size_bits)(const ir_mode *mode)
 {
   ANNOUNCE();
-  return mode->size;
+  return _get_mode_size_bits(mode);
 }
 
-int get_mode_size_bytes(const ir_mode *mode) {
+int
+(get_mode_size_bytes)(const ir_mode *mode) {
   ANNOUNCE();
-  int size = get_mode_size_bits(mode);
-  if ((size & 7) != 0) return -1;
-  return size >> 3;
+  return _get_mode_size_bytes(mode);
 }
 
 int
-get_mode_align (const ir_mode *mode)
+(get_mode_sign)(const ir_mode *mode)
 {
   ANNOUNCE();
-  return mode->align;
+  return _get_mode_sign(mode);
 }
 
 int
-get_mode_sign (const ir_mode *mode)
+(get_mode_arithmetic)(const ir_mode *mode)
+{
+  ANNOUNCE();
+  return get_mode_arithmetic(mode);
+}
+
+
+/* Attribute modulo shift specifies for modes of kind irms_int_number
+ *  whether shift applies modulo to value of bits to shift.  Asserts
+ *  if mode is not irms_int_number.
+ */
+unsigned int
+(get_mode_modulo_shift)(const ir_mode *mode) {
+  return _get_mode_modulo_shift(mode);
+}
+
+unsigned int
+(get_mode_n_vector_elems)(const ir_mode *mode) {
+  return _get_mode_vector_elems(mode);
+}
+
+void *
+(get_mode_link)(const ir_mode *mode)
 {
   ANNOUNCE();
-  return mode->sign;
+  return _get_mode_link(mode);
+}
+
+void
+(set_mode_link)(ir_mode *mode, void *l)
+{
+  _set_mode_link(mode, l);
 }
 
 tarval *
@@ -283,7 +458,7 @@ get_mode_min (ir_mode *mode)
   assert(get_mode_modecode(mode) < num_modes);
   assert(mode_is_data(mode));
 
-  return modes_min[get_mode_modecode(mode)];
+  return mode->min;
 }
 
 tarval *
@@ -294,7 +469,7 @@ get_mode_max (ir_mode *mode)
   assert(get_mode_modecode(mode) < num_modes);
   assert(mode_is_data(mode));
 
-  return modes_max[get_mode_modecode(mode)];
+  return mode->max;
 }
 
 tarval *
@@ -305,7 +480,7 @@ get_mode_null (ir_mode *mode)
   assert(get_mode_modecode(mode) < num_modes);
   assert(mode_is_data(mode));
 
-  return modes_null[get_mode_modecode(mode)];
+  return mode->null;
 }
 
 tarval *
@@ -316,7 +491,18 @@ get_mode_one (ir_mode *mode)
   assert(get_mode_modecode(mode) < num_modes);
   assert(mode_is_data(mode));
 
-  return modes_one[get_mode_modecode(mode)];
+  return mode->one;
+}
+
+tarval *
+get_mode_minus_one (ir_mode *mode)
+{
+  ANNOUNCE();
+  assert(mode);
+  assert(get_mode_modecode(mode) < num_modes);
+  assert(mode_is_data(mode));
+
+  return mode->minus_one;
 }
 
 tarval *
@@ -327,7 +513,7 @@ get_mode_infinite(ir_mode *mode)
   assert(get_mode_modecode(mode) < num_modes);
   assert(mode_is_float(mode));
 
-  return get_tarval_inf(mode);
+  return get_tarval_plus_inf(mode);
 }
 
 tarval *
@@ -341,140 +527,101 @@ get_mode_NAN(ir_mode *mode)
   return get_tarval_nan(mode);
 }
 
-/* Functions to check, whether a modecode is signed, float, int, num, data,
-   datab or dataM. For more exact definitions read the corresponding pages
-   in the firm documentation or the followingenumeration
-
-   The set of "float" is defined as:
-   ---------------------------------
-   float = {irm_F, irm_D, irm_E}
-
-   The set of "int" is defined as:
-   -------------------------------
-   int   = {irm_Bs, irm_Bu, irm_Hs, irm_Hu, irm_Is, irm_Iu, irm_Ls, irm_Lu}
-
-   The set of "num" is defined as:
-   -------------------------------
-   num   = {irm_F, irm_D, irm_E, irm_Bs, irm_Bu, irm_Hs, irm_Hu,
-            irm_Is, irm_Iu, irm_Ls, irm_Lu}
-            = {float || int}
-
-   The set of "data" is defined as:
-   -------------------------------
-   data  = {irm_F, irm_D, irm_E irm_Bs, irm_Bu, irm_Hs, irm_Hu,
-            irm_Is, irm_Iu, irm_Ls, irm_Lu, irm_C, irm_U, irm_P}
-            = {num || irm_C || irm_U || irm_P}
-
-   The set of "datab" is defined as:
-   ---------------------------------
-   datab = {irm_F, irm_D, irm_E, irm_Bs, irm_Bu, irm_Hs, irm_Hu,
-            irm_Is, irm_Iu, irm_Ls, irm_Lu, irm_C, irm_U, irm_P, irm_b}
-            = {data || irm_b }
-
-   The set of "dataM" is defined as:
-   ---------------------------------
-   dataM = {irm_F, irm_D, irm_E, irm_Bs, irm_Bu, irm_Hs, irm_Hu,
-            irm_Is, irm_Iu, irm_Ls, irm_Lu, irm_C, irm_U, irm_P, irm_M}
-            = {data || irm_M}
-*/
-
-#ifdef MODE_ACCESS_DEFINES
-#  undef mode_is_signed
-#  undef mode_is_float
-#  undef mode_is_int
-#  undef mode_is_num
-#  undef mode_is_data
-#  undef mode_is_datab
-#  undef mode_is_dataM
-#endif
 int
-mode_is_signed (const ir_mode *mode)
-{
+is_mode (void *thing) {
+  if (get_kind(thing) == k_ir_mode)
+    return 1;
+  else
+    return 0;
+}
+
+int
+(mode_is_signed)(const ir_mode *mode) {
   ANNOUNCE();
-  assert(mode);
-  return mode->sign;
+  return _mode_is_signed(mode);
 }
 
 int
-mode_is_float (const ir_mode *mode)
-{
+(mode_is_float)(const ir_mode *mode) {
   ANNOUNCE();
-  assert(mode);
-  return (get_mode_sort(mode) == irms_float_number);
+  return _mode_is_float(mode);
 }
 
 int
-mode_is_int (const ir_mode *mode)
-{
+(mode_is_int)(const ir_mode *mode) {
   ANNOUNCE();
-  assert(mode);
-  return (get_mode_sort(mode) == irms_int_number);
+  return _mode_is_int(mode);
 }
 
-int mode_is_character (const ir_mode *mode)
-{
+int
+(mode_is_character)(const ir_mode *mode) {
   ANNOUNCE();
-  assert(mode);
-  return (get_mode_sort(mode) == irms_character);
+  return _mode_is_character(mode);
 }
 
-int mode_is_reference (const ir_mode *mode)
-{
+int
+(mode_is_reference)(const ir_mode *mode) {
   ANNOUNCE();
-  assert(mode);
-  return (get_mode_sort(mode) == irms_reference);
+  return _mode_is_reference(mode);
 }
 
 int
-mode_is_num (const ir_mode *mode)
-{
+(mode_is_num)(const ir_mode *mode) {
   ANNOUNCE();
-  assert(mode);
-  return (mode_is_int(mode) || mode_is_float(mode));
+  return _mode_is_num(mode);
 }
 
 int
-mode_is_data (const ir_mode *mode)
-{
+(mode_is_numP)(const ir_mode *mode) {
   ANNOUNCE();
-  assert(mode);
-  return (mode_is_num(mode) || get_mode_sort(mode) == irms_character || get_mode_sort(mode) == irms_reference);
+  return _mode_is_numP(mode);
 }
 
 int
-mode_is_datab (const ir_mode *mode)
-{
+(mode_is_data)(const ir_mode *mode) {
   ANNOUNCE();
-  assert(mode);
-  return (mode_is_data(mode) || get_mode_sort(mode) == irms_internal_boolean);
+  return _mode_is_data(mode);
 }
 
 int
-mode_is_dataM (const ir_mode *mode)
-{
+(mode_is_datab)(const ir_mode *mode) {
   ANNOUNCE();
-  assert(mode);
-  return (mode_is_data(mode) || get_mode_modecode(mode) == irm_M);
-}
-#ifdef MODE_ACCESS_DEFINES
-#  define mode_is_signed(mode) (mode)->sign
-#  define mode_is_float(mode) ((mode)->sort == irms_float_number)
-#  define mode_is_int(mode) ((mode)->sort == irms_int_number)
-#  define mode_is_num(mode) (((mode)->sort == irms_float_number) || ((mode)->sort == irms_int_number))
-#  define mode_is_data(mode) (((mode)->sort == irms_float_number) || ((mode)->sort == irms_int_number) || ((mode)->sort == irms_character) || ((mode)->sort == irms_reference))
-#  define mode_is_datab(mode) (((mode)->sort == irms_float_number) || ((mode)->sort == irms_int_number) || ((mode)->sort == irms_character) || ((mode)->sort == irms_reference) || ((mode)->sort == irms_internal_boolean))
-#  define mode_is_dataM(mode) (((mode)->sort == irms_float_number) || ((mode)->sort == irms_int_number) || ((mode)->sort == irms_character) || ((mode)->sort == irms_reference) || ((mode)->code == irm_M))
-#endif
+  return _mode_is_datab(mode);
+}
+
+int
+(mode_is_dataM)(const ir_mode *mode) {
+  ANNOUNCE();
+  return _mode_is_dataM(mode);
+}
+
+int
+(mode_is_float_vector)(const ir_mode *mode) {
+  ANNOUNCE();
+  return _mode_is_float_vector(mode);
+}
+
+int
+(mode_is_int_vector)(const ir_mode *mode) {
+  ANNOUNCE();
+  return _mode_is_int_vector(mode);
+}
+
 /* Returns true if sm can be converted to lm without loss. */
 int
 smaller_mode(const ir_mode *sm, const ir_mode *lm)
 {
+  int sm_bits, lm_bits;
+
   ANNOUNCE();
   assert(sm);
   assert(lm);
 
   if (sm == lm) return 1;
 
+  sm_bits = get_mode_size_bits(sm);
+  lm_bits = get_mode_size_bits(lm);
+
   switch(get_mode_sort(sm))
   {
     case irms_int_number:
@@ -485,18 +632,23 @@ smaller_mode(const ir_mode *sm, const ir_mode *lm)
            *   - both have the same sign and lm is the larger one
            *   - lm is the signed one and is at least two bits larger
            *     (one for the sign, one for the highest bit of sm)
+	   *   - sm & lm are two_complement and lm has greater or equal number of bits
            */
-          if (mode_is_signed(sm))
+          if (   get_mode_arithmetic(sm) == get_mode_arithmetic(lm)
+	      && get_mode_arithmetic(sm) == irma_twos_complement) {
+	    return lm_bits >= sm_bits;
+	  }
+          else if (mode_is_signed(sm))
           {
-            if ( mode_is_signed(lm) && (get_mode_size_bits(lm) > get_mode_size_bits(sm)) )
+            if ( mode_is_signed(lm) && (lm_bits >= sm_bits) )
               return 1;
           }
           else if (mode_is_signed(lm))
           {
-            if (get_mode_size_bits(lm) > get_mode_size_bits(sm) + 1)
+            if (lm_bits > sm_bits + 1)
               return 1;
           }
-          else if (get_mode_size_bits(lm) > get_mode_size_bits(sm))
+          else if (lm_bits >= sm_bits)
           {
             return 1;
           }
@@ -512,11 +664,11 @@ smaller_mode(const ir_mode *sm, const ir_mode *lm)
       break;
 
     case irms_float_number:
-      /* XXX currently only the three standard 32,64,80 bit floats
-       * are supported which can safely be converted */
-      if ( (get_mode_sort(lm) == irms_float_number)
-           && (get_mode_size_bits(lm) > get_mode_size_bits(sm)) )
-         return 1;
+      if (get_mode_arithmetic(sm) == get_mode_arithmetic(lm)) {
+        if ( (get_mode_sort(lm) == irms_float_number)
+           && (get_mode_size_bits(lm) >= get_mode_size_bits(sm)) )
+          return 1;
+      }
       break;
 
     case irms_reference:
@@ -531,234 +683,322 @@ smaller_mode(const ir_mode *sm, const ir_mode *lm)
   return 0;
 }
 
-/* ** initialization ** */
+/* initialization, build the default modes */
 void
 init_mode (void)
 {
+  ir_mode newmode;
   ANNOUNCE();
   /* init flexible array */
-  modes      = NEW_ARR_F(ir_mode, irm_max);
-  modes_min  = NEW_ARR_F(tarval*, irm_max);
-  modes_max  = NEW_ARR_F(tarval*, irm_max);
-  modes_null = NEW_ARR_F(tarval*, irm_max);
-  modes_one  = NEW_ARR_F(tarval*, irm_max);
 
+  obstack_init(&modes);
+
+  num_modes  =  0;
   /* initialize predefined modes */
+
+  /* Internal Modes */
+  newmode.arithmetic   = irma_none;
+  newmode.size         = 0;
+  newmode.sign         = 0;
+  newmode.modulo_shift = 0;
+  newmode.vector_elem  = 0;
+  newmode.link         = NULL;
+  newmode.tv_priv      = NULL;
+
+  /* Control Flow Modes*/
+  newmode.sort    = irms_control_flow;
+
   /* Basic Block */
-  mode_BB = &modes[irm_BB];
-  mode_BB->name    = id_from_str("BB", 2);
-  mode_BB->code    = irm_BB;
-  mode_BB->sort    = irms_auxiliary;
-  mode_BB->size    = 0;
-  mode_BB->align   = 0;
-  mode_BB->sign    = 0;
-  mode_BB->tv_priv = NULL;
-
-  /* eXecution */
-  mode_X = &modes[irm_X];
-  mode_X->name    = id_from_str("X", 1);
-  mode_X->code    = irm_X;
-  mode_X->sort    = irms_auxiliary;
-  mode_X->size    = 0;
-  mode_X->align   = 0;
-  mode_X->sign    = 0;
-  mode_X->tv_priv = NULL;
+  newmode.name    = new_id_from_chars("BB", 2);
+  newmode.code    = irm_BB;
+
+  mode_BB = register_mode(&newmode);
+
+/* eXecution */
+  newmode.name    = new_id_from_chars("X", 1);
+  newmode.code    = irm_X;
+
+  mode_X = register_mode(&newmode);
+
+  /* Memory Modes */
+  newmode.sort    = irms_memory;
 
   /* Memory */
-  mode_M = &modes[irm_M];
-  mode_M->name    = id_from_str("M", 1);
-  mode_M->code    = irm_M;
-  mode_M->sort    = irms_auxiliary;
-  mode_M->size    = 0;
-  mode_M->align   = 0;
-  mode_M->sign    = 0;
-  mode_M->tv_priv = NULL;
+  newmode.name    = new_id_from_chars("M", 1);
+  newmode.code    = irm_M;
+
+  mode_M = register_mode(&newmode);
+
+  /* Auxiliary Modes */
+  newmode.sort    = irms_auxiliary,
 
   /* Tuple */
-  mode_T = &modes[irm_T];
-  mode_T->name    = id_from_str("T", 1);
-  mode_T->code    = irm_T;
-  mode_T->sort    = irms_auxiliary,
-  mode_T->size    = 0;
-  mode_T->align   = 0;
-  mode_T->sign    = 0;
-  mode_T->tv_priv = NULL;
+  newmode.name    = new_id_from_chars("T", 1);
+  newmode.code    = irm_T;
+
+  mode_T = register_mode(&newmode);
+
+  /* ANY */
+  newmode.name    = new_id_from_chars("ANY", 3);
+  newmode.code    = irm_ANY;
+
+  mode_ANY = register_mode(&newmode);
+
+  /* BAD */
+  newmode.name    = new_id_from_chars("BAD", 3);
+  newmode.code    = irm_BAD;
+
+  mode_BAD = register_mode(&newmode);
+
+  /* Internal Boolean Modes */
+  newmode.sort    = irms_internal_boolean;
 
   /* boolean */
-  mode_b = &modes[irm_b];
-  mode_b->name    = id_from_str("b", 1);
-  mode_b->code    = irm_b;
-  mode_b->sort    = irms_internal_boolean;
-  mode_b->size    = 0;
-  mode_b->align   = 0;
-  mode_b->sign    = 0;
-  mode_b->tv_priv = NULL;
+  newmode.name    = new_id_from_chars("b", 1);
+  newmode.code    = irm_b;
+
+  mode_b = register_mode(&newmode);
+
+/* Data Modes */
+  newmode.vector_elem = 1;
+
+  /* Float Number Modes */
+  newmode.sort       = irms_float_number;
+  newmode.arithmetic = irma_ieee754;
 
   /* float */
-  mode_F = &modes[irm_F];
-  mode_F->name    = id_from_str("F", 1);
-  mode_F->code    = irm_F;
-  mode_F->sort    = irms_float_number;
-  mode_F->sign    = 1;
-  mode_F->align   = 4;
-  mode_F->size    = 32;
-  mode_F->tv_priv = NULL;
+  newmode.name    = new_id_from_chars("F", 1);
+  newmode.code    = irm_F;
+  newmode.sign    = 1;
+  newmode.size    = 32;
 
-  set_mode_values(mode_F);
+  mode_F = register_mode(&newmode);
 
   /* double */
-  mode_D = &modes[irm_D];
-  mode_D->name    = id_from_str("D", 1);
-  mode_D->code    = irm_D;
-  mode_D->sort    = irms_float_number;
-  mode_D->sign    = 1;
-  mode_D->align   = 4;
-  mode_D->size    = 64;
-  mode_D->tv_priv = NULL;
+  newmode.name    = new_id_from_chars("D", 1);
+  newmode.code    = irm_D;
+  newmode.sign    = 1;
+  newmode.size    = 64;
 
-  set_mode_values(mode_D);
+  mode_D = register_mode(&newmode);
 
   /* extended */
-  mode_E = &modes[irm_E];
-  mode_E->name    = id_from_str("E", 1);
-  mode_E->code    = irm_E;
-  mode_E->sort    = irms_float_number;
-  mode_E->sign    = 1;
-  mode_E->align   = 4;
-  mode_E->size    = 80;
-  mode_E->tv_priv = NULL;
+  newmode.name    = new_id_from_chars("E", 1);
+  newmode.code    = irm_E;
+  newmode.sign    = 1;
+  newmode.size    = 80;
 
-  set_mode_values(mode_E);
+  mode_E = register_mode(&newmode);
+
+  /* Integer Number Modes */
+  newmode.sort         = irms_int_number;
+  newmode.arithmetic   = irma_twos_complement;
 
   /* signed byte */
-  mode_Bs = &modes[irm_Bs];
-  mode_Bs->name    = id_from_str("Bs", 2);
-  mode_Bs->code    = irm_Bs;
-  mode_Bs->sort    = irms_int_number;
-  mode_Bs->sign    = 1;
-  mode_Bs->align   = 1;
-  mode_Bs->size    = 8;
-  mode_Bs->tv_priv = NULL;
+  newmode.name         = new_id_from_chars("Bs", 2);
+  newmode.code         = irm_Bs;
+  newmode.sign         = 1;
+  newmode.size         = 8;
+  newmode.modulo_shift = 32;
 
-  set_mode_values(mode_Bs);
+  mode_Bs = register_mode(&newmode);
 
   /* unsigned byte */
-  mode_Bu = &modes[irm_Bu];
-  mode_Bu->name    = id_from_str("Bu", 2);
-  mode_Bu->code    = irm_Bu;
-  mode_Bu->sort    = irms_int_number;
-  mode_Bu->sign    = 0;
-  mode_Bu->align   = 1;
-  mode_Bu->size    = 8;
-  mode_Bu->tv_priv = NULL;
+  newmode.name         = new_id_from_chars("Bu", 2);
+  newmode.code         = irm_Bu;
+  newmode.arithmetic   = irma_twos_complement;
+  newmode.sign         = 0;
+  newmode.size         = 8;
+  newmode.modulo_shift = 32;
 
-  set_mode_values(mode_Bu);
+  mode_Bu = register_mode(&newmode);
 
   /* signed short integer */
-  mode_Hs = &modes[irm_Hs];
-  mode_Hs->name    = id_from_str("Hs", 2);
-  mode_Hs->code    = irm_Hs;
-  mode_Hs->sort    = irms_int_number;
-  mode_Hs->sign    = 1;
-  mode_Hs->align   = 2;
-  mode_Hs->size    = 16;
-  mode_Hs->tv_priv = NULL;
+  newmode.name         = new_id_from_chars("Hs", 2);
+  newmode.code         = irm_Hs;
+  newmode.sign         = 1;
+  newmode.size         = 16;
+  newmode.modulo_shift = 32;
 
-  set_mode_values(mode_Hs);
+  mode_Hs = register_mode(&newmode);
 
   /* unsigned short integer */
-  mode_Hu = &modes[irm_Hu];
-  mode_Hu->name    = id_from_str("Hu", 2);
-  mode_Hu->code    = irm_Hu;
-  mode_Hu->sort    = irms_int_number;
-  mode_Hu->sign    = 0;
-  mode_Hu->align   = 2;
-  mode_Hu->size    = 16;
-  mode_Hu->tv_priv = NULL;
+  newmode.name         = new_id_from_chars("Hu", 2);
+  newmode.code         = irm_Hu;
+  newmode.sign         = 0;
+  newmode.size         = 16;
+  newmode.modulo_shift = 32;
 
-  set_mode_values(mode_Hu);
+  mode_Hu = register_mode(&newmode);
 
   /* signed integer */
-  mode_Is = &modes[irm_Is];
-  mode_Is->name    = id_from_str("Is", 2);
-  mode_Is->code    = irm_Is;
-  mode_Is->sort    = irms_int_number;
-  mode_Is->sign    = 1;
-  mode_Is->align   = 4;
-  mode_Is->size    = 32;
-  mode_Is->tv_priv = NULL;
+  newmode.name         = new_id_from_chars("Is", 2);
+  newmode.code         = irm_Is;
+  newmode.sign         = 1;
+  newmode.size         = 32;
+  newmode.modulo_shift = 32;
 
-  set_mode_values(mode_Is);
+  mode_Is = register_mode(&newmode);
 
   /* unsigned integer */
-  mode_Iu = &modes[irm_Iu];
-  mode_Iu->name    = id_from_str("Iu", 2);
-  mode_Iu->code    = irm_Iu;
-  mode_Iu->sort    = irms_int_number;
-  mode_Iu->sign    = 0;
-  mode_Iu->align   = 4;
-  mode_Iu->size    = 32;
-  mode_Iu->tv_priv = NULL;
+  newmode.name         = new_id_from_chars("Iu", 2);
+  newmode.code         = irm_Iu;
+  newmode.sign         = 0;
+  newmode.size         = 32;
+  newmode.modulo_shift = 32;
 
-  set_mode_values(mode_Iu);
+  mode_Iu = register_mode(&newmode);
 
   /* signed long integer */
-  mode_Ls = &modes[irm_Ls];
-  mode_Ls->name    = id_from_str("Ls", 2);
-  mode_Ls->code    = irm_Ls;
-  mode_Ls->sort    = irms_int_number;
-  mode_Ls->sign    = 1;
-  mode_Ls->align   = 4;
-  mode_Ls->size    = 64;
-  mode_Ls->tv_priv = NULL;
+  newmode.name         = new_id_from_chars("Ls", 2);
+  newmode.code         = irm_Ls;
+  newmode.sign         = 1;
+  newmode.size         = 64;
+  newmode.modulo_shift = 64;
 
-  set_mode_values(mode_Ls);
+  mode_Ls = register_mode(&newmode);
 
   /* unsigned long integer */
-  mode_Lu = &modes[irm_Lu];
-  mode_Lu->name    = id_from_str("Lu", 2);
-  mode_Lu->code    = irm_Lu;
-  mode_Lu->sort    = irms_int_number;
-  mode_Lu->sign    = 0;
-  mode_Lu->align   = 4;
-  mode_Lu->size    = 64;
-  mode_Lu->tv_priv = NULL;
+  newmode.name         = new_id_from_chars("Lu", 2);
+  newmode.code         = irm_Lu;
+  newmode.sign         = 0;
+  newmode.size         = 64;
+  newmode.modulo_shift = 64;
+
+  mode_Lu = register_mode(&newmode);
 
-  set_mode_values(mode_Lu);
+  /* Character Modes */
+  newmode.sort         = irms_character;
+  newmode.arithmetic   = irma_none;
 
   /* Character */
-  mode_C = &modes[irm_C];
-  mode_C->name    = id_from_str("C", 1);
-  mode_C->code    = irm_C;
-  mode_C->sort    = irms_character;
-  mode_C->sign    = 0;
-  mode_C->align   = 1;
-  mode_C->size    = 8;
-  mode_C->tv_priv = NULL;
+  newmode.name         = new_id_from_chars("C", 1);
+  newmode.code         = irm_C;
+  newmode.sign         = 0;
+  newmode.size         = 8;
+  newmode.modulo_shift = 32;
 
-  set_mode_values(mode_C);
+  mode_C = register_mode(&newmode);
 
   /* Unicode character */
-  mode_U = &modes[irm_U];
-  mode_U->name    = id_from_str("U", 1);
-  mode_U->code    = irm_U;
-  mode_U->sort    = irms_character;
-  mode_U->sign    = 0;
-  mode_U->align   = 2;
-  mode_U->size    = 16;
-  mode_U->tv_priv = NULL;
+  newmode.name         = new_id_from_chars("U", 1);
+  newmode.code         = irm_U;
+  newmode.sign         = 0;
+  newmode.size         = 16;
+  newmode.modulo_shift = 32;
+
+  mode_U = register_mode(&newmode);
 
-  set_mode_values(mode_U);
+  /* Reference Modes */
+  newmode.sort    = irms_reference;
+  newmode.arithmetic = irma_twos_complement;
 
   /* pointer */
-  mode_P = &modes[irm_P];
-  mode_P->name    = id_from_str("P", 1);
-  mode_P->code    = irm_P;
-  mode_P->sort    = irms_reference;
-  mode_P->sign    = 0;
-  mode_P->align   = 4;
-  mode_P->size    = 32;
-  mode_P->tv_priv = NULL;
-
-  num_modes = irm_max;
+  newmode.name         = new_id_from_chars("P", 1);
+  newmode.code         = irm_P;
+  newmode.sign         = 0;
+  newmode.size         = 32;
+  newmode.modulo_shift = 0;
+
+  mode_P = register_mode(&newmode);
+
+  /* set the machine specific modes to the predefined ones */
+  mode_P_mach = mode_P;
+}
+
+/* find a signed mode for an unsigned integer mode */
+ir_mode *find_unsigned_mode(const ir_mode *mode) {
+  ir_mode n = *mode;
+
+  if (mode->sort != irms_int_number);
+  n.sign = 0;
+  return find_mode(&n);
+}
+
+/* find an unsigned mode for a signed integer mode */
+ir_mode *find_signed_mode(const ir_mode *mode) {
+  ir_mode n = *mode;
+
+  assert(mode->sort == irms_int_number);
+  n.sign = 1;
+  return find_mode(&n);
+}
+
+/* finds a integer mode with 2*n bits for an integer mode with n bits. */
+ir_mode *find_double_bits_int_mode(const ir_mode *mode) {
+  ir_mode n = *mode;
+
+  assert(mode->sort == irms_int_number && mode->arithmetic == irma_twos_complement);
+
+  n.size = 2*mode->size;
+  return find_mode(&n);
+}
+
+/*
+ * Returns non-zero if the given mode honors signed zero's, i.e.,
+ * a +0 and a -0 exists and handled differently.
+ */
+int mode_honor_signed_zeros(const ir_mode *mode)
+{
+  /* for floating point, we know that IEEE 754 has +0 and -0,
+   * but always handles it identical.
+   */
+  if (mode->sort == irms_float_number)
+    return mode->arithmetic == irma_ieee754 ? 0 : 1;
+  return 0;
+}
+
+/*
+ * Returns non-zero if the given mode might overflow on unary Minus.
+ *
+ * This does NOT happen on IEEE 754.
+ */
+int mode_overflow_on_unary_Minus(const ir_mode *mode)
+{
+  if (mode->sort == irms_float_number)
+    return mode->arithmetic == irma_ieee754 ? 0 : 1;
+  return 1;
+}
+
+/*
+ * Returns non-zero if the mode has a reversed wrap-aound
+ * logic, especially (a + x) - x == a.
+ *
+ * This is normally true for integer modes, not for floating
+ * point modes.
+ */
+int mode_wrap_around(const ir_mode *mode) {
+  /* FIXME: better would be an extra mode property */
+  return mode_is_int(mode);
+}
+
+void finish_mode(void) {
+  obstack_free(&modes, 0);
+
+  mode_T   = NULL;
+  mode_X   = NULL;
+  mode_M   = NULL;
+  mode_BB  = NULL;
+  mode_ANY = NULL;
+  mode_BAD = NULL;
+
+  mode_F   = NULL;
+  mode_D   = NULL;
+  mode_E   = NULL;
+
+  mode_Bs  = NULL;
+  mode_Bu  = NULL;
+  mode_Hs  = NULL;
+  mode_Hu  = NULL;
+  mode_Is  = NULL;
+  mode_Iu  = NULL;
+  mode_Ls  = NULL;
+  mode_Lu  = NULL;
+
+  mode_C   = NULL;
+  mode_U   = NULL;
+  mode_b   = NULL;
+  mode_P   = NULL;
+
+  mode_P_mach = NULL;
 }