Extend mathfn_built_in to handle combined_fn

This patch extends mathfn_built_in to handle combined_fn, but keeps the
old built_in_function interface around since it's a common case.

Tested on x86_64-linux-gnu, aarch64-linux-gnu and arm-linux-gnueabi.

gcc/
	* builtins.h (mathfn_built_in): Add a variant that takes
	a combined_fn.
	* builtins.c: Include case-cfn-macros.h.
	(CASE_MATHFN): Use CASE_CFN_*.
	(CASE_MATHFN_REENT): Use CFN_ codes.
	(mathfn_built_in_2, mathfn_built_in_1): Replace built_in_function
	argument with a combined_fn.
	(mathfn_built_in): Add a variant that takes a combined_fn.
	(expand_builtin_int_roundingfn_2): Update callers accordingly.
	(fold_builtin_sincos, fold_builtin_classify): Likewise.

From-SVN: r230483

gcc/ChangeLog

 2015-11-17  Richard Sandiford  <richard.sandiford@arm.com>
 
+	* builtins.h (mathfn_built_in): Add a variant that takes
+	a combined_fn.
+	* builtins.c: Include case-cfn-macros.h.
+	(CASE_MATHFN): Use CASE_CFN_*.
+	(CASE_MATHFN_REENT): Use CFN_ codes.
+	(mathfn_built_in_2, mathfn_built_in_1): Replace built_in_function
+	argument with a combined_fn.
+	(mathfn_built_in): Add a variant that takes a combined_fn.
+	(expand_builtin_int_roundingfn_2): Update callers accordingly.
+	(fold_builtin_sincos, fold_builtin_classify): Likewise.
+
+2015-11-17  Richard Sandiford  <richard.sandiford@arm.com>
+
 	* tree-vect-patterns.c: Include case-cfn-macros.h.
 	(vect_recog_pow_pattern): Use combined_fn instead of built-in codes.
 

gcc/builtins.h

@@ -61,6 +61,7 @@ extern void expand_builtin_setjmp_setup (rtx, rtx);
 extern void expand_builtin_setjmp_receiver (rtx);
 extern void expand_builtin_update_setjmp_buf (rtx);
 extern tree mathfn_built_in (tree, enum built_in_function fn);
+extern tree mathfn_built_in (tree, combined_fn);
 extern rtx builtin_strncpy_read_str (void *, HOST_WIDE_INT, machine_mode);
 extern rtx builtin_memset_read_str (void *, HOST_WIDE_INT, machine_mode);
 extern rtx expand_builtin_saveregs (void);