[committed] Fix PR target/18442

[Eric Christopher]

This came up after the scalar mode supported p bits. With the right
combination of command line flags you could come up with an abi that
didn't have a 32-bit type. We have all of the patterns for supporting it
so this allows the combination.

Committed.

-eric 

2004-12-07  Eric Christopher  <echristo@redhat.com>
        
        PR target/18442
        * config/mips/mips.c (mips_vector_mode_supported_p):
	New function.
        (TARGET_SCALAR_MODE_SUPPORTED_P): Define to above.

===================================================================
RCS file: /cvs/gcc/gcc/gcc/config/mips/mips.c,v
retrieving revision 1.478
retrieving revision 1.479
diff -u -r1.478 -r1.479
--- gcc/gcc/config/mips/mips.c	2004/11/27 09:46:43	1.478
+++ gcc/gcc/config/mips/mips.c	2004/12/07 22:17:21	1.479
@@ -352,6 +352,7 @@
 				    tree, bool);
 static bool mips_callee_copies (CUMULATIVE_ARGS *, enum machine_mode mode,
 				tree, bool);
+static bool mips_scalar_mode_supported_p (enum machine_mode);
 static bool mips_vector_mode_supported_p (enum machine_mode);
 static rtx mips_prepare_builtin_arg (enum insn_code, unsigned int, tree *);
 static rtx mips_prepare_builtin_target (enum insn_code, unsigned int, rtx);
@@ -800,6 +801,9 @@
 #undef TARGET_VECTOR_MODE_SUPPORTED_P
 #define TARGET_VECTOR_MODE_SUPPORTED_P mips_vector_mode_supported_p
 
+#undef TARGET_SCALAR_MODE_SUPPORTED_P
+#define TARGET_SCALAR_MODE_SUPPORTED_P mips_scalar_mode_supported_p
+
 #undef TARGET_INIT_BUILTINS
 #define TARGET_INIT_BUILTINS mips_init_builtins
 #undef TARGET_EXPAND_BUILTIN
@@ -7076,6 +7080,28 @@
   return (mode == SImode || (TARGET_64BIT && mode == DImode));
 }
 
+/* Define this so that we can deal with a testcase like:
+
+   char foo __attribute__ ((mode (SI)));
+
+   then compiled with -mabi=64 and -mint64. We have no
+   32-bit type at that point and so the default case
+   always fails.  Instead of special casing everything
+   it's easier to accept SImode in this function and
+   then punt to the default which will work for all
+   of the cases where we deal with TARGET_64BIT, etc.  */
+static bool
+mips_scalar_mode_supported_p (enum machine_mode mode)
+{
+  /* We can always handle SImode.  */
+  if (mode == SImode)
+    return true;
+  else
+    return default_scalar_mode_supported_p (mode);
+
+}
+
+
 /* Target hook for vector_mode_supported_p.  */
 static bool
 mips_vector_mode_supported_p (enum machine_mode mode)