Promote pointer function arguments and return values to Pmode.

2011-07-21  H.J. Lu  <hongjiu.lu@intel.com>

	* config/i386/i386.c (function_value_64): Always return pointers
	in Pmode.
	(ix86_promote_function_mode): New.
	(TARGET_PROMOTE_FUNCTION_MODE): Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@176593 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 023f478..cf52904 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2011-07-21  H.J. Lu  <hongjiu.lu@intel.com>
+
+       * config/i386/i386.c (function_value_64): Always return pointers
+       in Pmode.
+       (ix86_promote_function_mode): New.
+       (TARGET_PROMOTE_FUNCTION_MODE): Likewise.
+
 2011-07-21  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>
 
        PR tree-optimization/49749

diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index da6c888..957b51d 100644 (file)
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -7078,6 +7078,11 @@ function_value_64 (enum machine_mode orig_mode, enum machine_mode mode,
          return gen_rtx_REG (mode, AX_REG);
        }
     }
+  else if (POINTER_TYPE_P (valtype))
+    {
+      /* Pointers are always returned in Pmode. */
+      mode = Pmode;
+    }
 
   ret = construct_container (mode, orig_mode, valtype, 1,
                             X86_64_REGPARM_MAX, X86_64_SSE_REGPARM_MAX,
@@ -7147,6 +7152,22 @@ 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 (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)
 {
@@ -34970,6 +34991,9 @@ 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