Mark ChangeLog

[pf3gnuchains/gcc-fork.git] / gcc / lower-subreg.c

diff --git a/gcc/lower-subreg.c b/gcc/lower-subreg.c
index 5f988a9..89f3044 100644 (file)
--- a/gcc/lower-subreg.c
+++ b/gcc/lower-subreg.c
@@ -1,5 +1,6 @@
 /* Decompose multiword subregs.
-   Copyright (C) 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+   Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012
+   Free Software Foundation, Inc.
    Contributed by Richard Henderson <rth@redhat.com>
                  Ian Lance Taylor <iant@google.com>
 
@@ -634,8 +635,15 @@ can_decompose_p (rtx x)
       unsigned int regno = REGNO (x);
 
       if (HARD_REGISTER_NUM_P (regno))
-       return (validate_subreg (word_mode, GET_MODE (x), x, UNITS_PER_WORD)
-               && HARD_REGNO_MODE_OK (regno, word_mode));
+       {
+         unsigned int byte, num_bytes;
+
+         num_bytes = GET_MODE_SIZE (GET_MODE (x));
+         for (byte = 0; byte < num_bytes; byte += UNITS_PER_WORD)
+           if (simplify_subreg_regno (regno, GET_MODE (x), byte, word_mode) < 0)
+             return false;
+         return true;
+       }
       else
        return !bitmap_bit_p (subreg_context, regno);
     }
@@ -1039,8 +1047,7 @@ resolve_shift_zext (rtx insn)
        src_reg = expand_shift (GET_CODE (op) == ASHIFT ?
                                LSHIFT_EXPR : RSHIFT_EXPR,
                                word_mode, src_reg,
-                               build_int_cst (NULL_TREE,
-                                              shift_count - BITS_PER_WORD),
+                               shift_count - BITS_PER_WORD,
                                dest_reg, 1);
     }
 
@@ -1129,10 +1136,11 @@ decompose_multiword_subregs (void)
              || GET_CODE (PATTERN (insn)) == USE)
            continue;
 
+         recog_memoized (insn);
+
          if (find_decomposable_shift_zext (insn))
            continue;
 
-         recog_memoized (insn);
          extract_insn (insn);
 
          set = simple_move (insn);
@@ -1371,7 +1379,6 @@ struct rtl_opt_pass pass_lower_subreg =
   0,                                    /* properties_provided */
   0,                                    /* properties_destroyed */
   0,                                    /* todo_flags_start */
-  TODO_dump_func |
   TODO_ggc_collect |
   TODO_verify_flow                      /* todo_flags_finish */
  }
@@ -1393,7 +1400,6 @@ struct rtl_opt_pass pass_lower_subreg2 =
   0,                                    /* properties_destroyed */
   0,                                    /* todo_flags_start */
   TODO_df_finish | TODO_verify_rtl_sharing |
-  TODO_dump_func |
   TODO_ggc_collect |
   TODO_verify_flow                      /* todo_flags_finish */
  }