arcv: Introduce riscv_is_micro_arch ()

ARC-V related optimisations must be guarded like:

  if (riscv_microarchitecture == <arch>) {
    ...
  }

Introduce an inline function that encapsulates this:

  static inline bool riscv_is_micro_arch (<arch>)

Use it to define  __riscv_rhx whenever compiling for the RHX
microarchitecture.

Signed-off-by: Shahab Vahedi <shahab@synopsys.com>

Author: Shahab Vahedi

gcc/config/riscv/riscv-c.cc

@@ -149,6 +149,9 @@ riscv_cpu_cpp_builtins (cpp_reader *pfile)
     builtin_define_with_int_value ("__riscv_th_v_intrinsic",
 				   riscv_ext_version_value (0, 11));
 
+  if (riscv_is_micro_arch (arcv_rhx100))
+    builtin_define ("__riscv_rhx");
+
   /* Define architecture extension test macros.  */
   builtin_define_with_int_value ("__riscv_arch_test", 1);
 

gcc/config/riscv/riscv-protos.h

@@ -821,6 +821,9 @@ extern unsigned int th_int_get_mask (unsigned int);
 extern unsigned int th_int_get_save_adjustment (void);
 extern rtx th_int_adjust_cfi_prologue (unsigned int);
 extern const char *th_asm_output_opcode (FILE *asm_out_file, const char *p);
+
+extern bool riscv_is_micro_arch (enum riscv_microarchitecture_type);
+
 #ifdef RTX_CODE
 extern const char*
 th_mempair_output_move (rtx[4], bool, machine_mode, RTX_CODE);

gcc/config/riscv/riscv.cc

@@ -898,6 +898,12 @@ typedef enum
 
 typedef insn_code (*code_for_push_pop_t) (machine_mode);
 
+bool
+riscv_is_micro_arch (enum riscv_microarchitecture_type arch)
+{
+  return (riscv_microarchitecture == arch);
+}
+
 void riscv_frame_info::reset(void)
 {
   total_size = 0;