(operands_match_p): For WORDS_BIG_ENDIAN machines,

make multiple register operands equivalent if the last register of
the groups are the same.
(subst_reloads): Use gen_lowpart_common to change mode of
reloadreg.

From-SVN: r3030

diff --git a/gcc/reload.c b/gcc/reload.c
index 7757dd7f0454b64942bc0207925d71379ea219b9..1b98a42854d57879c33f2e337d90e111054f8eb7 100644 (file)
--- a/gcc/reload.c
+++ b/gcc/reload.c
@@ -1592,6 +1592,16 @@ operands_match_p (x, y)
       else
        j = REGNO (y);
 
       else
        j = REGNO (y);
 

+      /* On a WORDS_BIG_ENDIAN machine, point to the last register of a
+        multiple hard register group, so that for example (reg:DI 0) and
+        (reg:SI 1) will be considered the same register.  */
+      if (WORDS_BIG_ENDIAN && GET_MODE_SIZE (GET_MODE (x)) > UNITS_PER_WORD
+         && i < FIRST_PSEUDO_REGISTER)
+       i += (GET_MODE_SIZE (GET_MODE (x)) / UNITS_PER_WORD) - 1;
+      if (WORDS_BIG_ENDIAN && GET_MODE_SIZE (GET_MODE (y)) > UNITS_PER_WORD
+         && j < FIRST_PSEUDO_REGISTER)
+       j += (GET_MODE_SIZE (GET_MODE (y)) / UNITS_PER_WORD) - 1;
+

       return i == j;
     }
   /* If two operands must match, because they are really a single
       return i == j;
     }
   /* If two operands must match, because they are really a single


@@ -4348,7 +4358,7 @@ subst_reloads ()
          /* Encapsulate RELOADREG so its machine mode matches what
             used to be there.  */
          if (GET_MODE (reloadreg) != r->mode && r->mode != VOIDmode)
          /* Encapsulate RELOADREG so its machine mode matches what
             used to be there.  */
          if (GET_MODE (reloadreg) != r->mode && r->mode != VOIDmode)

-           reloadreg = gen_rtx (REG, r->mode, REGNO (reloadreg));
+           reloadreg = gen_lowpart_common (r->mode, reloadreg);

 
          /* If we are putting this into a SUBREG and RELOADREG is a
             SUBREG, we would be making nested SUBREGs, so we have to fix
 
          /* If we are putting this into a SUBREG and RELOADREG is a
             SUBREG, we would be making nested SUBREGs, so we have to fix