[16/77] Add scalar_int_mode_pod

This patch adds a POD class for scalar integers, as an instance
of a new pod_mode template.  Later patches will use pod_mode in
situations that really do need to be POD; this patch is simply
using PODs to remove load-time initialisation.

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

gcc/
	* coretypes.h (pod_mode): New type.
	(scalar_int_mode_pod): New typedef.
	* machmode.h (pod_mode): New class.
	(int_n_data_t::m): Change type to scalar_int_mode_pod.
	* genmodes.c (emit_mode_int_n): Update accordingly.
	* lower-subreg.h (target_lower_subreg): Change type to
	scalar_int_mode_pod.
	* gdbhooks.py (build_pretty_printer): Handle pod_mode and
	scalar_int_mode_pod.

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

From-SVN: r251468

1 files changed, 14 insertions, 1 deletions

diff --git a/gcc/machmode.h b/gcc/machmode.h
index dda7c0a..25e72a8 100644
--- a/gcc/machmode.h
+++ b/gcc/machmode.h
@@ -293,6 +293,19 @@ opt_mode<T>::exists (U *mode) const
   return false;
 }
 
+/* A POD version of mode class T.  */
+
+template<typename T>
+struct pod_mode
+{
+  typedef typename mode_traits<T>::from_int from_int;
+
+  machine_mode m_mode;
+  ALWAYS_INLINE operator machine_mode () const { return m_mode; }
+  ALWAYS_INLINE operator T () const { return from_int (m_mode); }
+  ALWAYS_INLINE pod_mode &operator = (const T &m) { m_mode = m; return *this; }
+};
+
 /* Return true if mode M has type T.  */
 
 template<typename T>
@@ -647,7 +660,7 @@ extern void init_adjust_machine_modes (void);
 struct int_n_data_t {
   /* These parts are initailized by genmodes output */
   unsigned int bitsize;
-  machine_mode m;
+  scalar_int_mode_pod m;
   /* RID_* is RID_INTN_BASE + index into this array */
 };