* implicit-zee.c: New file.

[pf3gnuchains/gcc-fork.git] / gcc / rtlhooks.c

diff --git a/gcc/rtlhooks.c b/gcc/rtlhooks.c
index 0034da7..a64c067 100644 (file)
--- a/gcc/rtlhooks.c
+++ b/gcc/rtlhooks.c
@@ -1,11 +1,11 @@
 /* Generic hooks for the RTL middle-end.
-   Copyright (C) 2004, 2005 Free Software Foundation, Inc.
+   Copyright (C) 2004, 2005, 2007, 2008 Free Software Foundation, Inc.
 
 This file is part of GCC.
 
 GCC is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 2, or (at your option) any later
+Software Foundation; either version 3, or (at your option) any later
 version.
 
 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
@@ -14,9 +14,8 @@ FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 for more details.
 
 You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING.  If not, write to the Free
-Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301, USA.  */
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
 
 #include "config.h"
 #include "system.h"
@@ -44,11 +43,9 @@ gen_lowpart_general (enum machine_mode mode, rtx x)
 
   if (result)
     return result;
-  /* If it's a REG, it must be a hard reg that's not valid in MODE.  */
-  else if (REG_P (x)
-          /* Or we could have a subreg of a floating point value.  */
-          || (GET_CODE (x) == SUBREG
-              && FLOAT_MODE_P (GET_MODE (SUBREG_REG (x)))))
+  /* Handle SUBREGs and hard REGs that were rejected by
+     simplify_gen_subreg.  */
+  else if (REG_P (x) || GET_CODE (x) == SUBREG)
     {
       result = gen_lowpart_common (mode, copy_to_reg (x));
       gcc_assert (result != 0);
@@ -66,7 +63,7 @@ gen_lowpart_general (enum machine_mode mode, rtx x)
          && SCALAR_INT_MODE_P (GET_MODE (x))
          && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode),
                                    GET_MODE_BITSIZE (GET_MODE (x)))
-         && ! no_new_pseudos)
+         && !reload_completed)
        return gen_lowpart_general (mode, force_reg (GET_MODE (x), x));
 
       if (WORDS_BIG_ENDIAN)
@@ -96,9 +93,9 @@ gen_lowpart_no_emit_general (enum machine_mode mode, rtx x)
 }
 
 rtx
-reg_num_sign_bit_copies_general (rtx x ATTRIBUTE_UNUSED,
+reg_num_sign_bit_copies_general (const_rtx x ATTRIBUTE_UNUSED,
                                 enum machine_mode mode ATTRIBUTE_UNUSED,
-                                 rtx known_x ATTRIBUTE_UNUSED,
+                                 const_rtx known_x ATTRIBUTE_UNUSED,
                                 enum machine_mode known_mode ATTRIBUTE_UNUSED,
                                  unsigned int known_ret ATTRIBUTE_UNUSED,
                                  unsigned int *result ATTRIBUTE_UNUSED)
@@ -107,9 +104,9 @@ reg_num_sign_bit_copies_general (rtx x ATTRIBUTE_UNUSED,
 }
 
 rtx
-reg_nonzero_bits_general (rtx x ATTRIBUTE_UNUSED,
+reg_nonzero_bits_general (const_rtx x ATTRIBUTE_UNUSED,
                          enum machine_mode mode ATTRIBUTE_UNUSED,
-                         rtx known_x ATTRIBUTE_UNUSED,
+                         const_rtx known_x ATTRIBUTE_UNUSED,
                           enum machine_mode known_mode ATTRIBUTE_UNUSED,
                           unsigned HOST_WIDE_INT known_ret ATTRIBUTE_UNUSED,
                           unsigned HOST_WIDE_INT *nonzero ATTRIBUTE_UNUSED)
@@ -117,6 +114,13 @@ reg_nonzero_bits_general (rtx x ATTRIBUTE_UNUSED,
   return NULL;
 }
 
+bool
+reg_truncated_to_mode_general (enum machine_mode mode ATTRIBUTE_UNUSED,
+                              const_rtx x ATTRIBUTE_UNUSED)
+{
+  return false;
+}
+
 /* Assuming that X is an rtx (e.g., MEM, REG or SUBREG) for a fixed-point
    number, return an rtx (MEM, SUBREG, or CONST_INT) that refers to the
    least-significant part of X.
@@ -137,7 +141,7 @@ gen_lowpart_if_possible (enum machine_mode mode, rtx x)
     {
       /* This is the only other case we handle.  */
       int offset = 0;
-      rtx new;
+      rtx new_rtx;
 
       if (WORDS_BIG_ENDIAN)
        offset = (MAX (GET_MODE_SIZE (GET_MODE (x)), UNITS_PER_WORD)
@@ -148,13 +152,16 @@ gen_lowpart_if_possible (enum machine_mode mode, rtx x)
        offset -= (MIN (UNITS_PER_WORD, GET_MODE_SIZE (mode))
                   - MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (x))));
 
-      new = adjust_address_nv (x, mode, offset);
-      if (! memory_address_p (mode, XEXP (new, 0)))
+      new_rtx = adjust_address_nv (x, mode, offset);
+      if (! memory_address_addr_space_p (mode, XEXP (new_rtx, 0),
+                                        MEM_ADDR_SPACE (x)))
        return 0;
 
-      return new;
+      return new_rtx;
     }
-  else if (mode != GET_MODE (x) && GET_MODE (x) != VOIDmode)
+  else if (mode != GET_MODE (x) && GET_MODE (x) != VOIDmode
+          && validate_subreg (mode, GET_MODE (x), x,
+                               subreg_lowpart_offset (mode, GET_MODE (x))))
     return gen_lowpart_SUBREG (mode, x);
   else
     return 0;