From 67046e1b0088aea8b60d9ec4668c8ad12d10a019 Mon Sep 17 00:00:00 2001
From: Jan Nieuwenhuizen <janneke@gnu.org>
Date: Thu, 18 Oct 2018 20:06:10 +0200
Subject: [PATCH] mes: Move pair? to core.

* src/lib.c (pair_p): New function.  Gains 8% performance on MesCC.
---
 mes/module/mes/boot-0.scm.in             | 1 -
 mes/module/mes/boot-01.scm               | 1 -
 mes/module/mes/boot-02.scm               | 1 -
 mes/module/mes/type-0.mes                | 3 ---
 scaffold/boot/37-closure-lambda.scm      | 3 ---
 scaffold/boot/38-simple-format.scm       | 2 --
 scaffold/boot/4c-quasiquote.scm          | 5 ++---
 scaffold/boot/60-let-syntax-expanded.scm | 1 -
 src/lib.c                                | 6 ++++++
 9 files changed, 8 insertions(+), 15 deletions(-)

diff --git a/mes/module/mes/boot-0.scm.in b/mes/module/mes/boot-0.scm.in
index 23af0059..d8b61bab 100644
--- a/mes/module/mes/boot-0.scm.in
+++ b/mes/module/mes/boot-0.scm.in
@@ -42,7 +42,6 @@
 ;; end boot-00.scm
 
 ;; boot-01.scm
-(define (pair? x) (eq? (core:type x) <cell:pair>))
 (define (not x) (if x #f #t))
 
 (define (display x . rest)
diff --git a/mes/module/mes/boot-01.scm b/mes/module/mes/boot-01.scm
index 319d02dc..edad5e3c 100644
--- a/mes/module/mes/boot-01.scm
+++ b/mes/module/mes/boot-01.scm
@@ -32,7 +32,6 @@
 ;; end boot-00.scm
 
 ;; boot-01.scm
-(define (pair? x) (eq? (core:type x) <cell:pair>))
 (define (not x) (if x #f #t))
 
 (define (display x . rest)
diff --git a/mes/module/mes/boot-02.scm b/mes/module/mes/boot-02.scm
index d437b09b..e400db43 100644
--- a/mes/module/mes/boot-02.scm
+++ b/mes/module/mes/boot-02.scm
@@ -42,7 +42,6 @@
 ;; end boot-00.scm
 
 ;; boot-01.scm
-(define (pair? x) (eq? (core:type x) <cell:pair>))
 (define (not x) (if x #f #t))
 
 (define (display x . rest)
diff --git a/mes/module/mes/type-0.mes b/mes/module/mes/type-0.mes
index 4db75f9c..0a015994 100644
--- a/mes/module/mes/type-0.mes
+++ b/mes/module/mes/type-0.mes
@@ -75,9 +75,6 @@
 (define (number? x)
   (eq? (core:type x) <cell:number>))
 
-(define (pair? x)
-  (eq? (core:type x) <cell:pair>))
-
 (define (port? x)
   (eq? (core:type x) <cell:port>))
 
diff --git a/scaffold/boot/37-closure-lambda.scm b/scaffold/boot/37-closure-lambda.scm
index 2ff04c1a..5f0b968c 100644
--- a/scaffold/boot/37-closure-lambda.scm
+++ b/scaffold/boot/37-closure-lambda.scm
@@ -16,9 +16,6 @@
 ;;; You should have received a copy of the GNU General Public License
 ;;; along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
 
-(define (pair? x)
-  (eq? (core:type x) <cell:pair>))
-
 (define (atom? x)
   (if (pair? x) #f
       (if (null? x) #f
diff --git a/scaffold/boot/38-simple-format.scm b/scaffold/boot/38-simple-format.scm
index 4a1f9a80..cca39ec0 100644
--- a/scaffold/boot/38-simple-format.scm
+++ b/scaffold/boot/38-simple-format.scm
@@ -16,8 +16,6 @@
 ;;; You should have received a copy of the GNU General Public License
 ;;; along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
 
-(define (pair? x) (eq? (core:type x) <cell:pair>))
-
 (define (not x) (if x #f #t))
 
 (define-macro (or . x)
diff --git a/scaffold/boot/4c-quasiquote.scm b/scaffold/boot/4c-quasiquote.scm
index 5361991a..e5d3374b 100644
--- a/scaffold/boot/4c-quasiquote.scm
+++ b/scaffold/boot/4c-quasiquote.scm
@@ -16,7 +16,6 @@
 ;;; You should have received a copy of the GNU General Public License
 ;;; along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
 
-(define (pair? x) (eq? (core:type x) <cell:pair>))
 (define (vector? x)
   (eq? (core:type x) <cell:vector>))
 
@@ -85,7 +84,7 @@
 ;;          ((lambda (a d)
 ;;             (core:display "  a=") (core:display a) (core:display "\n")
 ;;             (core:display "  d=") (core:display d)
-            
+
 ;;             (if (pair? d)
 ;;                 (if (eq? (car d) 'quote)
 ;;                     (if (and (pair? a) (eq? (car a) 'quote))
@@ -133,7 +132,7 @@
             (core:display "\n")
             (core:display "CDR d=") (core:display d)
             (core:display "\n")
-            
+
                  (if (pair? d)
                      (if (eq? (car d) 'quote)
                          (if (and (pair? a) (eq? (car a) 'quote))
diff --git a/scaffold/boot/60-let-syntax-expanded.scm b/scaffold/boot/60-let-syntax-expanded.scm
index 8f84943f..9cec17fd 100644
--- a/scaffold/boot/60-let-syntax-expanded.scm
+++ b/scaffold/boot/60-let-syntax-expanded.scm
@@ -36,7 +36,6 @@
 (define <cell:pair> 7)
 (define <cell:string> 10)
 
-(define (pair? x) (eq? (core:type x) <cell:pair>))
 (define (not x) (if x #f #t))
 
 (define (display x . rest)
diff --git a/src/lib.c b/src/lib.c
index 882e5fdb..5730ce38 100644
--- a/src/lib.c
+++ b/src/lib.c
@@ -348,3 +348,9 @@ last_pair (SCM x)
     x = CDR (x);
   return x;
 }
+
+SCM
+pair_p (SCM x)
+{
+  return TYPE (x) == TPAIR ? cell_t : cell_f;
+}