arc64: fp: reused the ARCv2 C macros for code-diversity management (gcc-mirror#97)

This helps reduce the #ifdef'ery in downstream projects (glibc).
The old scheme would add yet another set of macros for ARCv3:32

Signed-off-by: Vineet Gupta <[email protected]>

Author: vineetgarc

gcc/config/arc64/arc64-c.c

@@ -63,6 +63,17 @@ arc64_cpu_cpp_builtins (cpp_reader * pfile)
   else if (arc64_cmodel_var == ARC64_CMODEL_LARGE)
     builtin_define ("__ARC64_CMODEL_LARGE__");
 
+  if (TARGET_HARD_FLOAT)
+    {
+      builtin_define ("__arc_hard_float__");
+      builtin_define ("__ARC_HARD_FLOAT__");
+    }
+  else
+    {
+      builtin_define ("__arc_soft_float__");
+      builtin_define ("__ARC_SOFT_FLOAT__");
+    }
+
 #undef ARC64_C_DEF
 #define ARC64_C_DEF(NAME, CONDITION)		\
   def_or_undef_macro (pfile, NAME, CONDITION);

gcc/config/arc64/arc64-c.def

@@ -21,8 +21,8 @@ ARC64_C_DEF ("__ARC64_ATOMIC_1__", arc64_atomic_option == 1)
 ARC64_C_DEF ("__ARC64_ATOMIC_2__", arc64_atomic_option == 2)
 ARC64_C_DEF ("__ARC64_ATOMIC_3__", arc64_atomic_option == 3)
 ARC64_C_DEF ("__ARC64_UNALIGNED__", unaligned_access)
-ARC64_C_DEF ("__ARC64_FPUS__", ARC64_HAS_FPUS)
-ARC64_C_DEF ("__ARC64_FPUD__", ARC64_HAS_FPUD)
+ARC64_C_DEF ("__ARC_FPU_SP__", ARC64_HAS_FPUS)
+ARC64_C_DEF ("__ARC_FPU_DP__", ARC64_HAS_FPUD)
 ARC64_C_DEF ("__ARC64_M128__", TARGET_WIDE_LDST)
 ARC64_C_DEF ("__ARC64_WIDE_VECTOR__", TARGET_WIDE_SIMD)
 

gcc/config/arc64/arc64.h

@@ -604,6 +604,8 @@ extern const enum reg_class arc64_regno_to_regclass[];
 #define ARC64_HAS_FPUS    (arc64_fp_model > 0)
 #define ARC64_HAS_FPUD    (arc64_fp_model > 1)
 
+#define TARGET_HARD_FLOAT ARC64_HAS_FP_BASE
+
 /* Vector SIMD length.  */
 #define ARC64_VFP_32    (arc64_fp_model == 1)
 #define ARC64_VFP_64    ((arc64_fp_model == 2) && !TARGET_WIDE_SIMD)