[NDS32] Fix incorrect settings in sfp-machine.h and t-nds32-newlib for hard fp.

libgcc/
	* config/nds32/sfp-machine.h: Fix settings for NDS32_ABI_2FP_PLUS.
	* config/nds32/t-nds32-newlib (HOST_LIBGCC2_CFLAGS): Use -fwrapv.

From-SVN: r259645

libgcc/ChangeLog

+2018-04-25  Chung-Ju Wu  <jasonwucj@gmail.com>
+
+	* config/nds32/sfp-machine.h: Fix settings for NDS32_ABI_2FP_PLUS.
+	* config/nds32/t-nds32-newlib (HOST_LIBGCC2_CFLAGS): Use -fwrapv.
+
 2018-04-24  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* config/i386/linux-unwind.h: Add (__CET__ & 2) != 0 check

libgcc/config/nds32/sfp-machine.h

@@ -76,6 +76,25 @@ typedef int __gcc_CMPtype __attribute__ ((mode (__libgcc_cmp_return__)));
     R##_c = FP_CLS_NAN;						\
   } while (0)
 
+#ifdef NDS32_ABI_2FP_PLUS
+#define FP_RND_NEAREST		0x0
+#define FP_RND_PINF		0x1
+#define FP_RND_MINF		0x2
+#define FP_RND_ZERO		0x3
+#define FP_RND_MASK		0x3
+
+#define _FP_DECL_EX \
+  unsigned long int _fcsr __attribute__ ((unused)) = FP_RND_NEAREST
+
+#define FP_INIT_ROUNDMODE			\
+  do {						\
+    _fcsr = __builtin_nds32_fmfcsr ();		\
+  } while (0)
+
+#define FP_ROUNDMODE (_fcsr & FP_RND_MASK)
+
+#endif
+
 /* Not checked.  */
 #define _FP_TININESS_AFTER_ROUNDING 0
 

libgcc/config/nds32/t-nds32-newlib

@@ -19,7 +19,7 @@
 # <http://www.gnu.org/licenses/>.
 
 # Compiler flags to use when compiling 'libgcc2.c'
-HOST_LIBGCC2_CFLAGS = -O2
+HOST_LIBGCC2_CFLAGS = -O2 -fwrapv
 
 
 #LIB1ASMSRC   = nds32/lib1asmsrc-newlib.S