diff --git a/gcc/recog.c b/gcc/recog.c
index 2114df8c0d1..5a42c45361d 100644
--- a/gcc/recog.c
+++ b/gcc/recog.c
@@ -1776,20 +1776,20 @@ pop_operand (rtx op, machine_mode mode)
   return XEXP (op, 0) == stack_pointer_rtx;
 }
 
-/* Return 1 if ADDR is a valid memory address
+/* Return true if ADDR is a valid memory address
    for mode MODE in address space AS.  */
 
-int
+bool
 memory_address_addr_space_p (machine_mode mode ATTRIBUTE_UNUSED,
 			     rtx addr, addr_space_t as)
 {
 #ifdef GO_IF_LEGITIMATE_ADDRESS
   gcc_assert (ADDR_SPACE_GENERIC_P (as));
   GO_IF_LEGITIMATE_ADDRESS (mode, addr, win);
-  return 0;
+  return false;
 
  win:
-  return 1;
+  return true;
 #else
   return targetm.addr_space.legitimate_address_p (mode, addr, 0, as);
 #endif
@@ -2361,18 +2361,16 @@ find_constant_term_loc (rtx *p)
   return 0;
 }
 
-/* Return 1 if OP is a memory reference
-   whose address contains no side effects
-   and remains valid after the addition
-   of a positive integer less than the
-   size of the object being referenced.
+/* Return true if OP is a memory reference whose address contains
+   no side effects and remains valid after the addition of a positive
+   integer less than the size of the object being referenced.
 
    We assume that the original address is valid and do not check it.
 
    This uses strict_memory_address_p as a subroutine, so
    don't use it before reload.  */
 
-int
+bool
 offsettable_memref_p (rtx op)
 {
   return ((MEM_P (op))
@@ -2383,7 +2381,7 @@ offsettable_memref_p (rtx op)
 /* Similar, but don't require a strictly valid mem ref:
    consider pseudo-regs valid as index or base regs.  */
 
-int
+bool
 offsettable_nonstrict_memref_p (rtx op)
 {
   return ((MEM_P (op))
@@ -2391,7 +2389,7 @@ offsettable_nonstrict_memref_p (rtx op)
 					       MEM_ADDR_SPACE (op)));
 }
 
-/* Return 1 if Y is a memory address which contains no side effects
+/* Return true if Y is a memory address which contains no side effects
    and would remain valid for address space AS after the addition of
    a positive integer less than the size of that mode.
 
@@ -2401,7 +2399,7 @@ offsettable_nonstrict_memref_p (rtx op)
    If STRICTP is nonzero, we require a strictly valid address,
    for the sake of use in reload.c.  */
 
-int
+bool
 offsettable_address_addr_space_p (int strictp, machine_mode mode, rtx y,
 				  addr_space_t as)
 {
@@ -2409,19 +2407,19 @@ offsettable_address_addr_space_p (int strictp, machine_mode mode, rtx y,
   rtx z;
   rtx y1 = y;
   rtx *y2;
-  int (*addressp) (machine_mode, rtx, addr_space_t) =
+  bool (*addressp) (machine_mode, rtx, addr_space_t) =
     (strictp ? strict_memory_address_addr_space_p
 	     : memory_address_addr_space_p);
   poly_int64 mode_sz = GET_MODE_SIZE (mode);
 
   if (CONSTANT_ADDRESS_P (y))
-    return 1;
+    return true;
 
   /* Adjusting an offsettable address involves changing to a narrower mode.
      Make sure that's OK.  */
 
   if (mode_dependent_address_p (y, as))
-    return 0;
+    return false;
 
   machine_mode address_mode = GET_MODE (y);
   if (address_mode == VOIDmode)
@@ -2442,7 +2440,7 @@ offsettable_address_addr_space_p (int strictp, machine_mode mode, rtx y,
 
   if ((ycode == PLUS) && (y2 = find_constant_term_loc (&y1)))
     {
-      int good;
+      bool good;
 
       y1 = *y2;
       *y2 = plus_constant (address_mode, *y2, mode_sz - 1);
@@ -2456,7 +2454,7 @@ offsettable_address_addr_space_p (int strictp, machine_mode mode, rtx y,
     }
 
   if (GET_RTX_CLASS (ycode) == RTX_AUTOINC)
-    return 0;
+    return false;
 
   /* The offset added here is chosen as the maximum offset that
      any instruction could need to add when operating on something
@@ -2486,7 +2484,7 @@ offsettable_address_addr_space_p (int strictp, machine_mode mode, rtx y,
   return (*addressp) (QImode, z, as);
 }
 
-/* Return 1 if ADDR is an address-expression whose effect depends
+/* Return true if ADDR is an address-expression whose effect depends
    on the mode of the memory reference it is used in.
 
    ADDRSPACE is the address space associated with the address.
diff --git a/gcc/recog.h b/gcc/recog.h
index 653d0b08184..1df1a6e7404 100644
--- a/gcc/recog.h
+++ b/gcc/recog.h
@@ -200,11 +200,11 @@ extern void temporarily_undo_changes (int);
 extern void redo_changes (int);
 extern int constrain_operands (int, alternative_mask);
 extern int constrain_operands_cached (rtx_insn *, int);
-extern int memory_address_addr_space_p (machine_mode, rtx, addr_space_t);
+extern bool memory_address_addr_space_p (machine_mode, rtx, addr_space_t);
 #define memory_address_p(mode,addr) \
 	memory_address_addr_space_p ((mode), (addr), ADDR_SPACE_GENERIC)
-extern int strict_memory_address_addr_space_p (machine_mode, rtx,
-					       addr_space_t);
+extern bool strict_memory_address_addr_space_p (machine_mode, rtx,
+						addr_space_t);
 #define strict_memory_address_p(mode,addr) \
 	strict_memory_address_addr_space_p ((mode), (addr), ADDR_SPACE_GENERIC)
 extern int validate_replace_rtx_subexp (rtx, rtx, rtx_insn *, rtx *);
@@ -218,9 +218,9 @@ extern int num_changes_pending (void);
 extern bool reg_fits_class_p (const_rtx, reg_class_t, int, machine_mode);
 extern bool valid_insn_p (rtx_insn *);
 
-extern int offsettable_memref_p (rtx);
-extern int offsettable_nonstrict_memref_p (rtx);
-extern int offsettable_address_addr_space_p (int, machine_mode, rtx,
+extern bool offsettable_memref_p (rtx);
+extern bool offsettable_nonstrict_memref_p (rtx);
+extern bool offsettable_address_addr_space_p (int, machine_mode, rtx,
 					     addr_space_t);
 #define offsettable_address_p(strict,mode,addr) \
 	offsettable_address_addr_space_p ((strict), (mode), (addr), \
diff --git a/gcc/reload.c b/gcc/reload.c
index d21be917e56..4c55ca58a5f 100644
--- a/gcc/reload.c
+++ b/gcc/reload.c
@@ -262,8 +262,8 @@ static bool alternative_allows_const_pool_ref (rtx, const char *, int);
 static rtx find_reloads_toplev (rtx, int, enum reload_type, int, int,
 				rtx_insn *, int *);
 static rtx make_memloc (rtx, int);
-static int maybe_memory_address_addr_space_p (machine_mode, rtx,
-					      addr_space_t, rtx *);
+static bool maybe_memory_address_addr_space_p (machine_mode, rtx,
+					       addr_space_t, rtx *);
 static int find_reloads_address (machine_mode, rtx *, rtx, rtx *,
 				 int, enum reload_type, int, rtx_insn *);
 static rtx subst_reg_equivs (rtx, rtx_insn *);
@@ -2156,21 +2156,21 @@ hard_reg_set_here_p (unsigned int beg_regno, unsigned int end_regno, rtx x)
   return 0;
 }
 
-/* Return 1 if ADDR is a valid memory address for mode MODE
+/* Return true if ADDR is a valid memory address for mode MODE
    in address space AS, and check that each pseudo reg has the
    proper kind of hard reg.  */
 
-int
+bool
 strict_memory_address_addr_space_p (machine_mode mode ATTRIBUTE_UNUSED,
 				    rtx addr, addr_space_t as)
 {
 #ifdef GO_IF_LEGITIMATE_ADDRESS
   gcc_assert (ADDR_SPACE_GENERIC_P (as));
   GO_IF_LEGITIMATE_ADDRESS (mode, addr, win);
-  return 0;
+  return false;
 
  win:
-  return 1;
+  return true;
 #else
   return targetm.addr_space.legitimate_address_p (mode, addr, 1, as);
 #endif
@@ -4829,11 +4829,11 @@ make_memloc (rtx ad, int regno)
    to mode MODE in address space AS by reloading the part pointed to
    by PART into a register.  */
 
-static int
+static bool
 maybe_memory_address_addr_space_p (machine_mode mode, rtx ad,
 				   addr_space_t as, rtx *part)
 {
-  int retv;
+  bool retv;
   rtx tem = *part;
   rtx reg = gen_rtx_REG (GET_MODE (tem), max_reg_num ());
 
