PATCH [3/n] X32: Promote pointers to Pmode

[H.J. Lu]

Hi,

X32 psABI requires promoting pointers to Pmode when passing/returning
in registers.  OK for trunk?

Thanks.

H.J.
--
2011-07-09  H.J. Lu  <hongjiu...@intel.com>

        * config/i386/i386.c (ix86_promote_function_mode): New.
        (TARGET_PROMOTE_FUNCTION_MODE): Likewise.

diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 04cb07d..c852719 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -7052,6 +7061,23 @@ ix86_function_value (const_tree valtype, const_tree 
fntype_or_decl,
   return ix86_function_value_1 (valtype, fntype_or_decl, orig_mode, mode);
 }
 
+/* Pointer function arguments and return values are promoted to
+   Pmode.  */
+
+static enum machine_mode
+ix86_promote_function_mode (const_tree type, enum machine_mode mode,
+                           int *punsignedp, const_tree fntype,
+                           int for_return)
+{
+  if (for_return != 1 && type != NULL_TREE && POINTER_TYPE_P (type))
+    {
+      *punsignedp = POINTERS_EXTEND_UNSIGNED;
+      return Pmode;
+    }
+  return default_promote_function_mode (type, mode, punsignedp, fntype,
+                                       for_return);
+}
+
 rtx
 ix86_libcall_value (enum machine_mode mode)
 {
@@ -34810,6 +35154,9 @@ ix86_autovectorize_vector_sizes (void)
 #undef TARGET_FUNCTION_VALUE_REGNO_P
 #define TARGET_FUNCTION_VALUE_REGNO_P ix86_function_value_regno_p
 
+#undef TARGET_PROMOTE_FUNCTION_MODE
+#define TARGET_PROMOTE_FUNCTION_MODE ix86_promote_function_mode
+
 #undef TARGET_SECONDARY_RELOAD
 #define TARGET_SECONDARY_RELOAD ix86_secondary_reload