diff --git a/guile-readline/readline.c b/guile-readline/readline.c
index c47f82438..1c4b3eee3 100644
--- a/guile-readline/readline.c
+++ b/guile-readline/readline.c
@@ -342,7 +342,7 @@ SCM_DEFINE (scm_read_history, "read-history", 1, 0, 0,
 #define FUNC_NAME s_scm_read_history
 {
   SCM_VALIDATE_STRING (1,file);
-  return SCM_NEGATE_BOOL (read_history (SCM_STRING_CHARS (file)));
+  return scm_from_bool (!read_history (SCM_STRING_CHARS (file)));
 }
 #undef FUNC_NAME
 
@@ -353,7 +353,7 @@ SCM_DEFINE (scm_write_history, "write-history", 1, 0, 0,
 #define FUNC_NAME s_scm_write_history
 {
   SCM_VALIDATE_STRING (1,file);
-  return SCM_NEGATE_BOOL (write_history (SCM_STRING_CHARS (file)));
+  return scm_from_bool (!write_history (SCM_STRING_CHARS (file)));
 }
 #undef FUNC_NAME
 
diff --git a/srfi/srfi-1.c b/srfi/srfi-1.c
index c50b47850..b7d0b5ecf 100644
--- a/srfi/srfi-1.c
+++ b/srfi/srfi-1.c
@@ -99,7 +99,7 @@ SCM_DEFINE (scm_srfi1_count, "count", 2, 0, 1,
       SCM_ASSERT (pred_tramp, pred, SCM_ARG1, FUNC_NAME);
 
       for ( ; SCM_CONSP (lst1); lst1 = SCM_CDR (lst1))
-        count += ! SCM_FALSEP (pred_tramp (pred, SCM_CAR (lst1)));
+        count += scm_is_true (pred_tramp (pred, SCM_CAR (lst1)));
 
     end_lst1:
       SCM_ASSERT_TYPE (SCM_NULL_OR_NIL_P (lst1), lst1, SCM_ARG2, FUNC_NAME,
@@ -125,8 +125,8 @@ SCM_DEFINE (scm_srfi1_count, "count", 2, 0, 1,
                                FUNC_NAME, "list");
               break;
             }
-          count += ! SCM_FALSEP (pred_tramp
-                                 (pred, SCM_CAR (lst1), SCM_CAR (lst2)));
+          count += scm_is_true (pred_tramp
+				(pred, SCM_CAR (lst1), SCM_CAR (lst2)));
           lst1 = SCM_CDR (lst1);
           lst2 = SCM_CDR (lst2);
         }
@@ -165,7 +165,7 @@ SCM_DEFINE (scm_srfi1_count, "count", 2, 0, 1,
               SCM_SETCAR (l, SCM_CDR (lst));  /* keep rest of lst */
             }
 
-          count += ! SCM_FALSEP (scm_apply (pred, args, SCM_EOL));
+          count += scm_is_true (scm_apply (pred, args, SCM_EOL));
         }
     }
  done:
@@ -218,7 +218,7 @@ SCM_DEFINE (scm_srfi1_delete, "delete", 2, 1, 0,
 
   for ( ; SCM_CONSP (lst); lst = SCM_CDR (lst))
     {
-      if (! SCM_FALSEP (equal_p (pred, x, SCM_CAR (lst))))
+      if (scm_is_true (equal_p (pred, x, SCM_CAR (lst))))
         {
           /* delete this element, so copy from keeplst (inclusive) to lst
              (exclusive) onto ret */
@@ -277,7 +277,7 @@ SCM_DEFINE (scm_srfi1_delete_x, "delete!", 2, 1, 0,
        SCM_CONSP (walk);
        walk = SCM_CDR (walk))
     {
-      if (! SCM_FALSEP (equal_p (pred, x, SCM_CAR (walk))))
+      if (scm_is_true (equal_p (pred, x, SCM_CAR (walk))))
 	*prev = SCM_CDR (walk);
       else
 	prev = SCM_CDRLOC (walk);
@@ -362,7 +362,7 @@ SCM_DEFINE (scm_srfi1_delete_duplicates, "delete-duplicates", 1, 1, 0,
           /* loop searching ret upto lst */
           for (l = ret; ! SCM_EQ_P (l, lst); l = SCM_CDR (l))
             {
-              if (! SCM_FALSEP (equal_p (pred, SCM_CAR (l), item)))
+              if (scm_is_true (equal_p (pred, SCM_CAR (l), item)))
                 {
                   /* duplicate, don't want this element, so copy keeplst
                      (inclusive) to lst (exclusive) onto ret */
@@ -447,7 +447,7 @@ SCM_DEFINE (scm_srfi1_delete_duplicates_x, "delete-duplicates!", 1, 1, 0,
           l = ret;
           for (;;)
             {
-              if (! SCM_FALSEP (equal_p (pred, SCM_CAR (l), item)))
+              if (scm_is_true (equal_p (pred, SCM_CAR (l), item)))
                 break;  /* equal, forget this element */
 
               if (SCM_EQ_P (l, endret))
@@ -739,7 +739,7 @@ SCM_DEFINE (scm_srfi1_member, "member", 2, 1, 0,
     }
   for (; !SCM_NULL_OR_NIL_P (lst); lst = SCM_CDR (lst))
     {
-      if (!SCM_FALSEP (equal_p (pred, SCM_CAR (lst), x)))
+      if (scm_is_true (equal_p (pred, SCM_CAR (lst), x)))
 	return lst;
     }
   return SCM_BOOL_F;
@@ -767,7 +767,7 @@ SCM_DEFINE (scm_srfi1_assoc, "assoc", 2, 1, 0,
       SCM tmp = SCM_CAR (ls);
       SCM_ASSERT_TYPE (SCM_CONSP (tmp), alist, SCM_ARG2, FUNC_NAME,
 		       "association list");
-      if (SCM_NFALSEP (equal_p (pred, SCM_CAR (tmp), key)))
+      if (scm_is_true (equal_p (pred, SCM_CAR (tmp), key)))
 	return tmp;
     }
   SCM_ASSERT_TYPE (SCM_NULL_OR_NIL_P (ls), alist, SCM_ARG2, FUNC_NAME,
@@ -798,7 +798,7 @@ SCM_DEFINE (scm_srfi1_partition, "partition", 2, 0, 0,
   for (; !SCM_NULL_OR_NIL_P (list); list = SCM_CDR(list)) {
     SCM elt = SCM_CAR(list);
     SCM new_tail = scm_cons(SCM_CAR(list), SCM_EOL);
-    if (SCM_NFALSEP(call(pred, elt))) {
+    if (scm_is_true (call (pred, elt))) {
       SCM_SETCDR(kept_tail, new_tail);
       kept_tail = new_tail;
     }
diff --git a/srfi/srfi-13.c b/srfi/srfi-13.c
index 8cf53c28f..eb26c3711 100644
--- a/srfi/srfi-13.c
+++ b/srfi/srfi-13.c
@@ -47,7 +47,7 @@ SCM_DEFINE (scm_string_any, "string-any", 2, 2, 0,
   while (cstart < cend)
     {
       res = scm_call_1 (pred, SCM_MAKE_CHAR (*cstr));
-      if (!SCM_FALSEP (res))
+      if (scm_is_true (res))
 	return res;
       cstr++;
       cstart++;
@@ -79,7 +79,7 @@ SCM_DEFINE (scm_string_every, "string-every", 2, 2, 0,
   while (cstart < cend)
     {
       res = scm_call_1 (pred, SCM_MAKE_CHAR (*cstr));
-      if (SCM_FALSEP (res))
+      if (scm_is_false (res))
 	return res;
       cstr++;
       cstart++;
@@ -625,7 +625,7 @@ SCM_DEFINE (scm_string_trim, "string-trim", 1, 3, 0,
 	  SCM res;
 
 	  res = scm_call_1 (char_pred, SCM_MAKE_CHAR (cstr[cstart]));
-	  if (SCM_FALSEP (res))
+	  if (scm_is_false (res))
 	    break;
 	  cstart++;
 	}
@@ -700,7 +700,7 @@ SCM_DEFINE (scm_string_trim_right, "string-trim-right", 1, 3, 0,
 	  SCM res;
 
 	  res = scm_call_1 (char_pred, SCM_MAKE_CHAR (cstr[cend - 1]));
-	  if (SCM_FALSEP (res))
+	  if (scm_is_false (res))
 	    break;
 	  cend--;
 	}
@@ -793,7 +793,7 @@ SCM_DEFINE (scm_string_trim_both, "string-trim-both", 1, 3, 0,
 	  SCM res;
 
 	  res = scm_call_1 (char_pred, SCM_MAKE_CHAR (cstr[cstart]));
-	  if (SCM_FALSEP (res))
+	  if (scm_is_false (res))
 	    break;
 	  cstart++;
 	}
@@ -802,7 +802,7 @@ SCM_DEFINE (scm_string_trim_both, "string-trim-both", 1, 3, 0,
 	  SCM res;
 
 	  res = scm_call_1 (char_pred, SCM_MAKE_CHAR (cstr[cend - 1]));
-	  if (SCM_FALSEP (res))
+	  if (scm_is_false (res))
 	    break;
 	  cend--;
 	}
@@ -1480,12 +1480,12 @@ SCM_DEFINE (scm_string_prefix_p, "string-prefix?", 2, 4, 0,
   while (cstart1 < cend1 && cstart2 < cend2)
     {
       if (cstr1[cstart1] != cstr2[cstart2])
-	return SCM_BOOL (len == len1);
+	return scm_from_bool (len == len1);
       len++;
       cstart1++;
       cstart2++;
     }
-  return SCM_BOOL (len == len1);
+  return scm_from_bool (len == len1);
 }
 #undef FUNC_NAME
 
@@ -1509,12 +1509,12 @@ SCM_DEFINE (scm_string_prefix_ci_p, "string-prefix-ci?", 2, 4, 0,
   while (cstart1 < cend1 && cstart2 < cend2)
     {
       if (scm_c_downcase (cstr1[cstart1]) != scm_c_downcase (cstr2[cstart2]))
-	return SCM_BOOL (len == len1);
+	return scm_from_bool (len == len1);
       len++;
       cstart1++;
       cstart2++;
     }
-  return SCM_BOOL (len == len1);
+  return scm_from_bool (len == len1);
 }
 #undef FUNC_NAME
 
@@ -1540,10 +1540,10 @@ SCM_DEFINE (scm_string_suffix_p, "string-suffix?", 2, 4, 0,
       cend1--;
       cend2--;
       if (cstr1[cend1] != cstr2[cend2])
-	return SCM_BOOL (len == len1);
+	return scm_from_bool (len == len1);
       len++;
     }
-  return SCM_BOOL (len == len1);
+  return scm_from_bool (len == len1);
 }
 #undef FUNC_NAME
 
@@ -1569,10 +1569,10 @@ SCM_DEFINE (scm_string_suffix_ci_p, "string-suffix-ci?", 2, 4, 0,
       cend1--;
       cend2--;
       if (scm_c_downcase (cstr1[cend1]) != scm_c_downcase (cstr2[cend2]))
-	return SCM_BOOL (len == len1);
+	return scm_from_bool (len == len1);
       len++;
     }
-  return SCM_BOOL (len == len1);
+  return scm_from_bool (len == len1);
 }
 #undef FUNC_NAME
 
@@ -1628,7 +1628,7 @@ SCM_DEFINE (scm_string_indexS, "string-index", 2, 2, 0,
 	{
 	  SCM res;
 	  res = scm_call_1 (char_pred, SCM_MAKE_CHAR (cstr[cstart]));
-	  if (!SCM_FALSEP (res))
+	  if (scm_is_true (res))
 	    return SCM_MAKINUM (cstart);
 	  cstart++;
 	}
@@ -1688,7 +1688,7 @@ SCM_DEFINE (scm_string_index_right, "string-index-right", 2, 2, 0,
 	  SCM res;
 	  cend--;
 	  res = scm_call_1 (char_pred, SCM_MAKE_CHAR (cstr[cend]));
-	  if (!SCM_FALSEP (res))
+	  if (scm_is_true (res))
 	    return SCM_MAKINUM (cend);
 	}
     }
@@ -1747,7 +1747,7 @@ SCM_DEFINE (scm_string_skip, "string-skip", 2, 2, 0,
 	{
 	  SCM res;
 	  res = scm_call_1 (char_pred, SCM_MAKE_CHAR (cstr[cstart]));
-	  if (SCM_FALSEP (res))
+	  if (scm_is_false (res))
 	    return SCM_MAKINUM (cstart);
 	  cstart++;
 	}
@@ -1808,7 +1808,7 @@ SCM_DEFINE (scm_string_skip_right, "string-skip-right", 2, 2, 0,
 	  SCM res;
 	  cend--;
 	  res = scm_call_1 (char_pred, SCM_MAKE_CHAR (cstr[cend]));
-	  if (SCM_FALSEP (res))
+	  if (scm_is_false (res))
 	    return SCM_MAKINUM (cend);
 	}
     }
@@ -1867,7 +1867,7 @@ SCM_DEFINE (scm_string_count, "string-count", 2, 2, 0,
 	{
 	  SCM res;
 	  res = scm_call_1 (char_pred, SCM_MAKE_CHAR (cstr[cstart]));
-	  if (!SCM_FALSEP (res))
+	  if (scm_is_true (res))
 	    count++;
 	  cstart++;
 	}
@@ -2086,7 +2086,7 @@ string_titlecase_x (SCM str, int start, int end)
   sz = SCM_STRING_UCHARS (str);
   for(i = start; i < end;  i++)
     {
-      if (!SCM_FALSEP (scm_char_alphabetic_p (SCM_MAKE_CHAR (sz[i]))))
+      if (scm_is_true (scm_char_alphabetic_p (SCM_MAKE_CHAR (sz[i]))))
 	{
 	  if (!in_word)
 	    {
@@ -2528,7 +2528,7 @@ SCM_DEFINE (scm_string_unfold, "string-unfold", 4, 2, 0,
     SCM_VALIDATE_PROC (6, make_final);
 
   res = scm_call_1 (p, seed);
-  while (SCM_FALSEP (res))
+  while (scm_is_false (res))
     {
       SCM str;
       SCM ch = scm_call_1 (f, seed);
@@ -2590,7 +2590,7 @@ SCM_DEFINE (scm_string_unfold_right, "string-unfold-right", 4, 2, 0,
     SCM_VALIDATE_PROC (6, make_final);
 
   res = scm_call_1 (p, seed);
-  while (SCM_FALSEP (res))
+  while (scm_is_false (res))
     {
       SCM str;
       SCM ch = scm_call_1 (f, seed);
@@ -2895,7 +2895,7 @@ SCM_DEFINE (scm_string_filter, "string-filter", 2, 2, 0,
 	{
 	  SCM res;
 	  res = scm_call_1 (char_pred, SCM_MAKE_CHAR (cstr[idx]));
-	  if (!SCM_FALSEP (res))
+	  if (scm_is_true (res))
 	    ls = scm_cons (SCM_MAKE_CHAR (cstr[idx]), ls);
 	  idx++;
 	}
@@ -2961,7 +2961,7 @@ SCM_DEFINE (scm_string_delete, "string-delete", 2, 2, 0,
 	{
 	  SCM res;
 	  res = scm_call_1 (char_pred, SCM_MAKE_CHAR (cstr[idx]));
-	  if (SCM_FALSEP (res))
+	  if (scm_is_false (res))
 	    ls = scm_cons (SCM_MAKE_CHAR (cstr[idx]), ls);
 	  idx++;
 	}
diff --git a/srfi/srfi-14.c b/srfi/srfi-14.c
index aeae52aa2..0ab29672a 100644
--- a/srfi/srfi-14.c
+++ b/srfi/srfi-14.c
@@ -85,7 +85,7 @@ SCM_DEFINE (scm_char_set_p, "char-set?", 1, 0, 0,
 	    "otherwise.")
 #define FUNC_NAME s_scm_char_set_p
 {
-  return SCM_BOOL (SCM_SMOB_PREDICATE (scm_tc16_charset, obj));
+  return scm_from_bool (SCM_SMOB_PREDICATE (scm_tc16_charset, obj));
 }
 #undef FUNC_NAME
 
@@ -261,7 +261,7 @@ SCM_DEFINE (scm_end_of_char_set_p, "end-of-char-set?", 1, 0, 0,
   int ccursor;
 
   SCM_VALIDATE_INUM_MIN_COPY (1, cursor, 0, ccursor);
-  return SCM_BOOL (ccursor >= SCM_CHARSET_SIZE);
+  return scm_from_bool (ccursor >= SCM_CHARSET_SIZE);
 }
 #undef FUNC_NAME
 
@@ -316,7 +316,7 @@ SCM_DEFINE (scm_char_set_unfold, "char-set-unfold", 4, 1, 0,
     result = make_char_set (FUNC_NAME);
 
   tmp = scm_call_1 (p, seed);
-  while (SCM_FALSEP (tmp))
+  while (scm_is_false (tmp))
     {
       SCM ch = scm_call_1 (f, seed);
       if (!SCM_CHARP (ch))
@@ -354,7 +354,7 @@ SCM_DEFINE (scm_char_set_unfold_x, "char-set-unfold!", 5, 0, 0,
   SCM_VALIDATE_SMOB (5, base_cs, charset);
 
   tmp = scm_call_1 (p, seed);
-  while (SCM_FALSEP (tmp))
+  while (scm_is_false (tmp))
     {
       SCM ch = scm_call_1 (f, seed);
       if (!SCM_CHARP (ch))
@@ -606,7 +606,7 @@ SCM_DEFINE (scm_char_set_filter, "char-set-filter", 2, 1, 0,
 	{
 	  SCM res = scm_call_1 (pred, SCM_MAKE_CHAR (k));
 
-	  if (!SCM_FALSEP (res))
+	  if (scm_is_true (res))
 	    p[k / SCM_BITS_PER_LONG] |= 1L << (k % SCM_BITS_PER_LONG);
 	}
     }
@@ -635,7 +635,7 @@ SCM_DEFINE (scm_char_set_filter_x, "char-set-filter!", 3, 0, 0,
 	{
 	  SCM res = scm_call_1 (pred, SCM_MAKE_CHAR (k));
 
-	  if (!SCM_FALSEP (res))
+	  if (scm_is_true (res))
 	    p[k / SCM_BITS_PER_LONG] |= 1L << (k % SCM_BITS_PER_LONG);
 	}
     }
@@ -670,7 +670,7 @@ SCM_DEFINE (scm_ucs_range_to_char_set, "ucs-range->char-set", 2, 2, 0,
   SCM_ASSERT_RANGE (2, upper, cupper >= 0 && cupper >= clower);
   if (!SCM_UNBNDP (error))
     {
-      if (!SCM_FALSEP (error))
+      if (scm_is_true (error))
 	{
 	  SCM_ASSERT_RANGE (1, lower, clower <= SCM_CHARSET_SIZE);
 	  SCM_ASSERT_RANGE (2, upper, cupper <= SCM_CHARSET_SIZE);
@@ -721,7 +721,7 @@ SCM_DEFINE (scm_ucs_range_to_char_set_x, "ucs-range->char-set!", 4, 0, 0,
   SCM_VALIDATE_INUM_COPY (2, upper, cupper);
   SCM_ASSERT_RANGE (1, lower, clower >= 0);
   SCM_ASSERT_RANGE (2, upper, cupper >= 0 && cupper >= clower);
-  if (!SCM_FALSEP (error))
+  if (scm_is_true (error))
     {
       SCM_ASSERT_RANGE (1, lower, clower <= SCM_CHARSET_SIZE);
       SCM_ASSERT_RANGE (2, upper, cupper <= SCM_CHARSET_SIZE);
@@ -772,7 +772,7 @@ SCM_DEFINE (scm_char_set_count, "char-set-count", 2, 0, 0,
     if (SCM_CHARSET_GET (cs, k))
       {
 	SCM res = scm_call_1 (pred, SCM_MAKE_CHAR (k));
-	if (!SCM_FALSEP (res))
+	if (scm_is_true (res))
 	  count++;
       }
   return SCM_MAKINUM (count);
@@ -833,7 +833,7 @@ SCM_DEFINE (scm_char_set_contains_p, "char-set-contains?", 2, 0, 0,
 {
   SCM_VALIDATE_SMOB (1, cs, charset);
   SCM_VALIDATE_CHAR (2, ch);
-  return SCM_BOOL (SCM_CHARSET_GET (cs, SCM_CHAR (ch)));
+  return scm_from_bool (SCM_CHARSET_GET (cs, SCM_CHAR (ch)));
 }
 #undef FUNC_NAME
 
@@ -854,7 +854,7 @@ SCM_DEFINE (scm_char_set_every, "char-set-every", 2, 0, 0,
     if (SCM_CHARSET_GET (cs, k))
       {
 	res = scm_call_1 (pred, SCM_MAKE_CHAR (k));
-	if (SCM_FALSEP (res))
+	if (scm_is_false (res))
 	  return res;
       }
   return res;
@@ -877,7 +877,7 @@ SCM_DEFINE (scm_char_set_any, "char-set-any", 2, 0, 0,
     if (SCM_CHARSET_GET (cs, k))
       {
 	SCM res = scm_call_1 (pred, SCM_MAKE_CHAR (k));
-	if (!SCM_FALSEP (res))
+	if (scm_is_true (res))
 	  return res;
       }
   return SCM_BOOL_F;
diff --git a/srfi/srfi-4.c b/srfi/srfi-4.c
index 4a37112ed..d6507551d 100644
--- a/srfi/srfi-4.c
+++ b/srfi/srfi-4.c
@@ -279,8 +279,8 @@ SCM_DEFINE (scm_u8vector_p, "u8vector?", 1, 0, 0,
 	    "@code{#f} otherwise.")
 #define FUNC_NAME s_scm_u8vector_p
 {
-  return SCM_BOOL (SCM_SMOB_PREDICATE (scm_tc16_uvec, obj) &&
-		   SCM_UVEC_TYPE (obj) == SCM_UVEC_U8);
+  return scm_from_bool (SCM_SMOB_PREDICATE (scm_tc16_uvec, obj) &&
+			SCM_UVEC_TYPE (obj) == SCM_UVEC_U8);
 }
 #undef FUNC_NAME
 
@@ -465,8 +465,8 @@ SCM_DEFINE (scm_s8vector_p, "s8vector?", 1, 0, 0,
 	    "@code{#f} otherwise.")
 #define FUNC_NAME s_scm_s8vector_p
 {
-  return SCM_BOOL (SCM_SMOB_PREDICATE (scm_tc16_uvec, obj) &&
-		   SCM_UVEC_TYPE (obj) == SCM_UVEC_S8);
+  return scm_from_bool (SCM_SMOB_PREDICATE (scm_tc16_uvec, obj) &&
+			SCM_UVEC_TYPE (obj) == SCM_UVEC_S8);
 }
 #undef FUNC_NAME
 
@@ -653,8 +653,8 @@ SCM_DEFINE (scm_u16vector_p, "u16vector?", 1, 0, 0,
 	    "@code{#f} otherwise.")
 #define FUNC_NAME s_scm_u16vector_p
 {
-  return SCM_BOOL (SCM_SMOB_PREDICATE (scm_tc16_uvec, obj) &&
-		   SCM_UVEC_TYPE (obj) == SCM_UVEC_U16);
+  return scm_from_bool (SCM_SMOB_PREDICATE (scm_tc16_uvec, obj) &&
+			SCM_UVEC_TYPE (obj) == SCM_UVEC_U16);
 }
 #undef FUNC_NAME
 
@@ -823,8 +823,8 @@ SCM_DEFINE (scm_s16vector_p, "s16vector?", 1, 0, 0,
 	    "@code{#f} otherwise.")
 #define FUNC_NAME s_scm_s16vector_p
 {
-  return SCM_BOOL (SCM_SMOB_PREDICATE (scm_tc16_uvec, obj) &&
-		   SCM_UVEC_TYPE (obj) == SCM_UVEC_S16);
+  return scm_from_bool (SCM_SMOB_PREDICATE (scm_tc16_uvec, obj) &&
+			SCM_UVEC_TYPE (obj) == SCM_UVEC_S16);
 }
 #undef FUNC_NAME
 
@@ -996,8 +996,8 @@ SCM_DEFINE (scm_u32vector_p, "u32vector?", 1, 0, 0,
 	    "@code{#f} otherwise.")
 #define FUNC_NAME s_scm_u32vector_p
 {
-  return SCM_BOOL (SCM_SMOB_PREDICATE (scm_tc16_uvec, obj) &&
-		   SCM_UVEC_TYPE (obj) == SCM_UVEC_U32);
+  return scm_from_bool (SCM_SMOB_PREDICATE (scm_tc16_uvec, obj) &&
+			SCM_UVEC_TYPE (obj) == SCM_UVEC_U32);
 }
 #undef FUNC_NAME
 
@@ -1167,8 +1167,8 @@ SCM_DEFINE (scm_s32vector_p, "s32vector?", 1, 0, 0,
 	    "@code{#f} otherwise.")
 #define FUNC_NAME s_scm_s32vector_p
 {
-  return SCM_BOOL (SCM_SMOB_PREDICATE (scm_tc16_uvec, obj) &&
-		   SCM_UVEC_TYPE (obj) == SCM_UVEC_S32);
+  return scm_from_bool (SCM_SMOB_PREDICATE (scm_tc16_uvec, obj) &&
+			SCM_UVEC_TYPE (obj) == SCM_UVEC_S32);
 }
 #undef FUNC_NAME
 
@@ -1340,8 +1340,8 @@ SCM_DEFINE (scm_u64vector_p, "u64vector?", 1, 0, 0,
 	    "@code{#f} otherwise.")
 #define FUNC_NAME s_scm_u64vector_p
 {
-  return SCM_BOOL (SCM_SMOB_PREDICATE (scm_tc16_uvec, obj) &&
-		   SCM_UVEC_TYPE (obj) == SCM_UVEC_U64);
+  return scm_from_bool (SCM_SMOB_PREDICATE (scm_tc16_uvec, obj) &&
+			SCM_UVEC_TYPE (obj) == SCM_UVEC_U64);
 }
 #undef FUNC_NAME
 
@@ -1511,8 +1511,8 @@ SCM_DEFINE (scm_s64vector_p, "s64vector?", 1, 0, 0,
 	    "@code{#f} otherwise.")
 #define FUNC_NAME s_scm_s64vector_p
 {
-  return SCM_BOOL (SCM_SMOB_PREDICATE (scm_tc16_uvec, obj) &&
-		   SCM_UVEC_TYPE (obj) == SCM_UVEC_S64);
+  return scm_from_bool (SCM_SMOB_PREDICATE (scm_tc16_uvec, obj) &&
+			SCM_UVEC_TYPE (obj) == SCM_UVEC_S64);
 }
 #undef FUNC_NAME
 
@@ -1684,8 +1684,8 @@ SCM_DEFINE (scm_f32vector_p, "f32vector?", 1, 0, 0,
 	    "@code{#f} otherwise.")
 #define FUNC_NAME s_scm_f32vector_p
 {
-  return SCM_BOOL (SCM_SMOB_PREDICATE (scm_tc16_uvec, obj) &&
-		   SCM_UVEC_TYPE (obj) == SCM_UVEC_F32);
+  return scm_from_bool (SCM_SMOB_PREDICATE (scm_tc16_uvec, obj) &&
+			SCM_UVEC_TYPE (obj) == SCM_UVEC_F32);
 }
 #undef FUNC_NAME
 
@@ -1880,8 +1880,8 @@ SCM_DEFINE (scm_f64vector_p, "f64vector?", 1, 0, 0,
 	    "@code{#f} otherwise.")
 #define FUNC_NAME s_scm_f64vector_p
 {
-  return SCM_BOOL (SCM_SMOB_PREDICATE (scm_tc16_uvec, obj) &&
-		   SCM_UVEC_TYPE (obj) == SCM_UVEC_F64);
+  return scm_from_bool (SCM_SMOB_PREDICATE (scm_tc16_uvec, obj) &&
+			SCM_UVEC_TYPE (obj) == SCM_UVEC_F64);
 }
 #undef FUNC_NAME