rx.c (rx_function_value): Small integer types are promotes to SImode.

        * config/rx/rx.c (rx_function_value): Small integer types are
        promotes to SImode.
        (rx_promote_function_mode): New function.
        (TARGET_PROMOTE_FUNCTION_MODE): Define.

From-SVN: r165690

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 1d6ada9d4018d1a9d3ed84de88d74d8486e4e790..e124df79ed511305705faf65c74836fea4929a51 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2010-10-19  Nick Clifton  <nickc@redhat.com>
+
+       * config/rx/rx.c (rx_function_value): Small integer types are
+       promotes to SImode.
+       (rx_promote_function_mode): New function.
+       (TARGET_PROMOTE_FUNCTION_MODE): Define.
+
 2010-10-19  Nick Clifton  <nickc@redhat.com>
 
        * config/mep/mep.c (mep_print_operand): Use

diff --git a/gcc/config/rx/rx.c b/gcc/config/rx/rx.c
index f087c665d06b3b9cdc166336ab7bb0a487f9f90d..2ce5f5895bc651b98f60e906039e78fc4a1a182b 100644 (file)
--- a/gcc/config/rx/rx.c
+++ b/gcc/config/rx/rx.c
@@ -830,7 +830,32 @@ rx_function_value (const_tree ret_type,
                   const_tree fn_decl_or_type ATTRIBUTE_UNUSED,
                   bool       outgoing ATTRIBUTE_UNUSED)
 {
-  return gen_rtx_REG (TYPE_MODE (ret_type), FUNC_RETURN_REGNUM);
+  enum machine_mode mode = TYPE_MODE (ret_type);
+
+  /* RX ABI specifies that small integer types are
+     promoted to int when returned by a function.  */
+  if (GET_MODE_SIZE (mode) > 0 && GET_MODE_SIZE (mode) < 4)
+    return gen_rtx_REG (SImode, FUNC_RETURN_REGNUM);
+    
+  return gen_rtx_REG (mode, FUNC_RETURN_REGNUM);
+}
+
+/* TARGET_PROMOTE_FUNCTION_MODE must behave in the same way with
+   regard to function returns as does TARGET_FUNCTION_VALUE.  */
+
+static enum machine_mode
+rx_promote_function_mode (const_tree type ATTRIBUTE_UNUSED,
+                         enum machine_mode mode,
+                         int * punsignedp,
+                         const_tree funtype ATTRIBUTE_UNUSED,
+                         int for_return)
+{
+  if (for_return != 1
+      || GET_MODE_SIZE (mode) >= 4
+      || GET_MODE_SIZE (mode) < 1)
+    return mode;
+
+  return SImode;
 }
 
 static bool
@@ -2825,6 +2850,9 @@ rx_memory_move_cost (enum machine_mode mode, enum reg_class regclass, bool in)
 #undef  TARGET_OPTION_OVERRIDE
 #define TARGET_OPTION_OVERRIDE                 rx_option_override
 
+#undef  TARGET_PROMOTE_FUNCTION_MODE
+#define TARGET_PROMOTE_FUNCTION_MODE           rx_promote_function_mode
+
 #undef  TARGET_OVERRIDE_OPTIONS_AFTER_CHANGE
 #define TARGET_OVERRIDE_OPTIONS_AFTER_CHANGE   rx_override_options_after_change