re PR target/47558 (163267 breaks exception traceback in xplor-nih)

	PR target/47558
	Add __ieee_divdc3 entry point.
	* config/i386/darwin.h (DECLARE_LIBRARY_RENAMES): Retain ___divdc3
	entry point.
	(SUBTARGET_INIT_BUILTINS): Call darwin_rename_builtins.
	* config/i386/i386.c (TARGET_INIT_LIBFUNCS): Likewise.
	* config/darwin.c (darwin_rename_builtins): Add.
	* config/darwin-protos.h (darwin_rename_builtins): Add.

From-SVN: r169902

gcc/ChangeLog

+2011-02-07  Mike Stump  <mikestump@comcast.net>
+
+	PR target/47558
+	Add __ieee_divdc3 entry point.
+	* config/i386/darwin.h (DECLARE_LIBRARY_RENAMES): Retain ___divdc3
+	entry point.
+	(SUBTARGET_INIT_BUILTINS): Call darwin_rename_builtins.
+	* config/i386/i386.c (TARGET_INIT_LIBFUNCS): Likewise.
+	* config/darwin.c (darwin_rename_builtins): Add.
+	* config/darwin-protos.h (darwin_rename_builtins): Add.
+
 2011-02-07  Michael Meissner  <meissner@linux.vnet.ibm.com>
 
 	PR target/47636

gcc/config/darwin-protos.h

@@ -124,3 +124,4 @@ extern bool darwin_use_anchors_for_symbol_p (const_rtx symbol);
 extern bool darwin_kextabi_p (void);
 extern void darwin_override_options (void);
 extern void darwin_patch_builtins (void);
+extern void darwin_rename_builtins (void);

gcc/config/darwin.c

@@ -2823,6 +2823,34 @@ darwin_fold_builtin (tree fndecl, int n_args, tree *argp,
   return NULL_TREE;
 }
 
+void
+darwin_rename_builtins (void)
+{
+  /* The system ___divdc3 routine in libSystem on darwin10 is not
+     accurate to 1ulp, ours is, so we avoid ever using the system name
+     for this routine and instead install a non-conflicting name that
+     is accurate.
+
+     When -ffast-math or -funsafe-math-optimizations is given, we can
+     use the faster version.  */
+  if (!flag_unsafe_math_optimizations)
+    {
+      int dcode = (BUILT_IN_COMPLEX_DIV_MIN
+		   + DCmode - MIN_MODE_COMPLEX_FLOAT);
+      tree fn = built_in_decls[dcode];
+      /* Fortran and c call TARGET_INIT_BUILTINS and
+	 TARGET_INIT_LIBFUNCS at different times, so we have to put a
+	 call into each to ensure that at least one of them is called
+	 after build_common_builtin_nodes.  A better fix is to add a
+	 new hook to run after build_common_builtin_nodes runs.  */
+      if (fn)
+	set_user_assembler_name (fn, "___ieee_divdc3");
+      fn = implicit_built_in_decls[dcode];
+      if (fn)
+	set_user_assembler_name (fn, "___ieee_divdc3");
+    }
+}
+
 static hashval_t
 cfstring_hash (const void *ptr)
 {

gcc/config/i386/darwin.h

@@ -309,5 +309,14 @@ do {									\
 #define SUBTARGET_INIT_BUILTINS					\
 do {								\
   darwin_init_cfstring_builtins ((unsigned) (IX86_BUILTIN_MAX));\
+  darwin_rename_builtins ();					\
 } while(0)
 
+/* The system ___divdc3 routine in libSystem on darwin10 is not
+   accurate to 1ulp, ours is, so we avoid ever using the system name
+   for this routine and instead install a non-conflicting name that is
+   accurate.  See darwin_rename_builtins.  */
+#ifdef L_divdc3
+#define DECLARE_LIBRARY_RENAMES \
+  asm(".text; ___divdc3: jmp ___ieee_divdc3 ; .globl ___divdc3");
+#endif

gcc/config/i386/i386.c

@@ -35040,6 +35040,11 @@ ix86_autovectorize_vector_sizes (void)
 #undef TARGET_CONDITIONAL_REGISTER_USAGE
 #define TARGET_CONDITIONAL_REGISTER_USAGE ix86_conditional_register_usage
 
+#if TARGET_MACHO
+#undef TARGET_INIT_LIBFUNCS
+#define TARGET_INIT_LIBFUNCS darwin_rename_builtins
+#endif
+
 struct gcc_target targetm = TARGET_INITIALIZER;
 
 #include "gt-i386.h"