[77/77] Add a complex_mode class

This patch adds another machine_mode wrapper for modes that are
known to be COMPLEX_MODE_P.  There aren't yet many places that make
use of it, but that might change in future.

2017-08-30  Richard Sandiford  <richard.sandiford@linaro.org>
	    Alan Hayward  <alan.hayward@arm.com>
	    David Sherwood  <david.sherwood@arm.com>

gcc/
	* coretypes.h (complex_mode): New type.
	* gdbhooks.py (build_pretty_printer): Handle it.
	* machmode.h (complex_mode): New class.
	(complex_mode::includes_p): New function.
	(is_complex_int_mode): Likewise.
	(is_complex_float_mode): Likewise.
	* genmodes.c (get_mode_class): Handle complex mode classes.
	* function.c (expand_function_end): Use is_complex_int_mode.

gcc/go/
	* go-lang.c (go_langhook_type_for_mode): Use is_complex_float_mode.

Co-Authored-By: Alan Hayward <alan.hayward@arm.com>
Co-Authored-By: David Sherwood <david.sherwood@arm.com>

From-SVN: r251527

1 files changed, 54 insertions, 0 deletions

diff --git a/gcc/machmode.h b/gcc/machmode.h
index 73c45be..b331f07 100644
--- a/gcc/machmode.h
+++ b/gcc/machmode.h
@@ -450,6 +450,30 @@ scalar_mode::includes_p (machine_mode m)
     }
 }
 
+/* Represents a machine mode that is known to be a COMPLEX_MODE_P.  */
+class complex_mode
+{
+public:
+  typedef mode_traits<complex_mode>::from_int from_int;
+
+  ALWAYS_INLINE complex_mode () {}
+  ALWAYS_INLINE complex_mode (from_int m) : m_mode (machine_mode (m)) {}
+  ALWAYS_INLINE operator machine_mode () const { return m_mode; }
+
+  static bool includes_p (machine_mode);
+
+protected:
+  machine_mode m_mode;
+};
+
+/* Return true if M is a complex_mode.  */
+
+inline bool
+complex_mode::includes_p (machine_mode m)
+{
+  return COMPLEX_MODE_P (m);
+}
+
 /* Return the base GET_MODE_SIZE value for MODE.  */
 
 ALWAYS_INLINE unsigned short
@@ -771,6 +795,36 @@ is_float_mode (machine_mode mode, T *float_mode)
   return false;
 }
 
+/* Return true if MODE has class MODE_COMPLEX_INT, storing it as
+   a complex_mode in *CMODE if so.  */
+
+template<typename T>
+inline bool
+is_complex_int_mode (machine_mode mode, T *cmode)
+{
+  if (GET_MODE_CLASS (mode) == MODE_COMPLEX_INT)
+    {
+      *cmode = complex_mode (complex_mode::from_int (mode));
+      return true;
+    }
+  return false;
+}
+
+/* Return true if MODE has class MODE_COMPLEX_FLOAT, storing it as
+   a complex_mode in *CMODE if so.  */
+
+template<typename T>
+inline bool
+is_complex_float_mode (machine_mode mode, T *cmode)
+{
+  if (GET_MODE_CLASS (mode) == MODE_COMPLEX_FLOAT)
+    {
+      *cmode = complex_mode (complex_mode::from_int (mode));
+      return true;
+    }
+  return false;
+}
+
 namespace mode_iterator
 {
   /* Start mode iterator *ITER at the first mode in class MCLASS, if any.  */