--- a/gcc/regs.h	Thu Oct 25 07:37:49 2018 +0900
+++ b/gcc/regs.h	Thu Feb 13 11:34:05 2020 +0900
@@ -1,5 +1,5 @@
 /* Define per-register tables for data flow info and register allocation.
-   Copyright (C) 1987-2018 Free Software Foundation, Inc.
+   Copyright (C) 1987-2020 Free Software Foundation, Inc.
 
 This file is part of GCC.
 
@@ -192,7 +192,7 @@
 /* Select a register mode required for caller save of hard regno REGNO.  */
 #ifndef HARD_REGNO_CALLER_SAVE_MODE
 #define HARD_REGNO_CALLER_SAVE_MODE(REGNO, NREGS, MODE) \
-  choose_hard_reg_mode (REGNO, NREGS, false)
+  choose_hard_reg_mode (REGNO, NREGS, NULL)
 #endif
 
 /* Target-dependent globals.  */
@@ -298,7 +298,7 @@
 /* Return true if REGS contains the whole of (reg:MODE REGNO).  */
 
 static inline bool
-in_hard_reg_set_p (const HARD_REG_SET regs, machine_mode mode,
+in_hard_reg_set_p (const_hard_reg_set regs, machine_mode mode,
 		   unsigned int regno)
 {
   unsigned int end_regno;
@@ -323,7 +323,7 @@
 /* Return true if (reg:MODE REGNO) includes an element of REGS.  */
 
 static inline bool
-overlaps_hard_reg_set_p (const HARD_REG_SET regs, machine_mode mode,
+overlaps_hard_reg_set_p (const_hard_reg_set regs, machine_mode mode,
 			 unsigned int regno)
 {
   unsigned int end_regno;
@@ -363,7 +363,7 @@
 /* Like overlaps_hard_reg_set_p, but use a REGNO/NREGS range instead of
    REGNO and MODE.  */
 static inline bool
-range_overlaps_hard_reg_set_p (const HARD_REG_SET set, unsigned regno,
+range_overlaps_hard_reg_set_p (const_hard_reg_set set, unsigned regno,
 			       int nregs)
 {
   while (nregs-- > 0)
@@ -375,7 +375,7 @@
 /* Like in_hard_reg_set_p, but use a REGNO/NREGS range instead of
    REGNO and MODE.  */
 static inline bool
-range_in_hard_reg_set_p (const HARD_REG_SET set, unsigned regno, int nregs)
+range_in_hard_reg_set_p (const_hard_reg_set set, unsigned regno, int nregs)
 {
   while (nregs-- > 0)
     if (!TEST_HARD_REG_BIT (set, regno + nregs))
@@ -383,8 +383,4 @@
   return true;
 }
 
-/* Get registers used by given function call instruction.  */
-extern bool get_call_reg_set_usage (rtx_insn *insn, HARD_REG_SET *reg_set,
-				    HARD_REG_SET default_set);
-
 #endif /* GCC_REGS_H */