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.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@169902 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 28 insertions, 0 deletions

diff --git a/gcc/config/darwin.c b/gcc/config/darwin.c
index cd6a815a483..8ccf18c4426 100644
--- a/gcc/config/darwin.c
+++ b/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)
 {