Mercurial > hg > xemacs-beta
comparison lisp/byte-optimize.el @ 5366:f00192e1cd49
Examining the result of #'length: `eql', not `=', it's better style & cheaper
2011-03-08 Aidan Kehoe <kehoea@parhasard.net>
* buff-menu.el (list-buffers-noselect):
* byte-optimize.el (byte-optimize-identity):
* byte-optimize.el (byte-optimize-if):
* byte-optimize.el (byte-optimize-nth):
* byte-optimize.el (byte-optimize-nthcdr):
* bytecomp.el (byte-compile-warn-wrong-args):
* bytecomp.el (byte-compile-two-args-19->20):
* bytecomp.el (byte-compile-list):
* bytecomp.el (byte-compile-beginning-of-line):
* bytecomp.el (byte-compile-set):
* bytecomp.el (byte-compile-set-default):
* bytecomp.el (byte-compile-values):
* bytecomp.el (byte-compile-values-list):
* bytecomp.el (byte-compile-integerp):
* bytecomp.el (byte-compile-multiple-value-list-internal):
* bytecomp.el (byte-compile-throw):
* cl-macs.el (cl-do-arglist):
* cl-macs.el (cl-parse-loop-clause):
* cl-macs.el (multiple-value-bind):
* cl-macs.el (multiple-value-setq):
* cl-macs.el (get-setf-method):
* cmdloop.el (command-error):
* cmdloop.el (y-or-n-p-minibuf):
* cmdloop.el (yes-or-no-p-minibuf):
* coding.el (unencodable-char-position):
* cus-edit.el (custom-face-prompt):
* cus-edit.el (custom-buffer-create-internal):
* cus-edit.el (widget-face-action):
* cus-edit.el (custom-group-value-create):
* descr-text.el (describe-char-unicode-data):
* dialog-gtk.el (popup-builtin-question-dialog):
* dragdrop.el (experimental-dragdrop-drop-log-function):
* dragdrop.el (experimental-dragdrop-drop-mime-default):
* easymenu.el (easy-menu-add):
* easymenu.el (easy-menu-remove):
* faces.el (read-face-name):
* faces.el (set-face-stipple):
* files.el (file-name-non-special):
* font.el (font-combine-fonts):
* font.el (font-set-face-font):
* font.el (font-parse-rgb-components):
* font.el (font-rgb-color-p):
* font.el (font-color-rgb-components):
* gnuserv.el (gnuserv-edit-files):
* help.el (key-or-menu-binding):
* help.el (function-documentation-1):
* help.el (function-documentation):
* info.el (info):
* isearch-mode.el (isearch-exit):
* isearch-mode.el (isearch-edit-string):
* isearch-mode.el (isearch-*-char):
* isearch-mode.el (isearch-complete1):
* ldap.el (ldap-encode-country-string):
* ldap.el (ldap-decode-string):
* minibuf.el (read-file-name-internal-1):
* minibuf.el (read-non-nil-coding-system):
* minibuf.el (get-user-response):
* mouse.el (drag-window-divider):
* mule/ccl.el:
* mule/ccl.el (ccl-compile-if):
* mule/ccl.el (ccl-compile-break):
* mule/ccl.el (ccl-compile-repeat):
* mule/ccl.el (ccl-compile-write-repeat):
* mule/ccl.el (ccl-compile-call):
* mule/ccl.el (ccl-compile-end):
* mule/ccl.el (ccl-compile-read-multibyte-character):
* mule/ccl.el (ccl-compile-write-multibyte-character):
* mule/ccl.el (ccl-compile-translate-character):
* mule/ccl.el (ccl-compile-mule-to-unicode):
* mule/ccl.el (ccl-compile-unicode-to-mule):
* mule/ccl.el (ccl-compile-lookup-integer):
* mule/ccl.el (ccl-compile-lookup-character):
* mule/ccl.el (ccl-compile-map-multiple):
* mule/ccl.el (ccl-compile-map-single):
* mule/devan-util.el (devanagari-compose-to-one-glyph):
* mule/devan-util.el (devanagari-composition-component):
* mule/mule-cmds.el (finish-set-language-environment):
* mule/viet-util.el:
* mule/viet-util.el (viet-encode-viscii-char):
* multicast.el (open-multicast-group):
* newcomment.el (comment-quote-nested):
* newcomment.el (comment-region):
* newcomment.el (comment-dwim):
* regexp-opt.el (regexp-opt-group):
* replace.el (map-query-replace-regexp):
* specifier.el (derive-device-type-from-tag-set):
* subr.el (skip-chars-quote):
* test-harness.el (test-harness-from-buffer):
* test-harness.el (batch-test-emacs):
* wid-edit.el (widget-choice-action):
* wid-edit.el (widget-symbol-prompt-internal):
* wid-edit.el (widget-color-action):
* window-xemacs.el (push-window-configuration):
* window-xemacs.el (pop-window-configuration):
* window.el (quit-window):
* x-compose.el (electric-diacritic):
It's better style, and cheaper (often one assembler instruction
vs. a C funcall in the byte code), to use `eql' instead of `='
when it's clear what numerical type a given result will be. Change
much of our code to do this, with the help of a byte-compiler
change (not comitted) that looked for calls to #'length (which
always returns an integer) in its args.
author | Aidan Kehoe <kehoea@parhasard.net> |
---|---|
date | Tue, 08 Mar 2011 23:41:52 +0000 |
parents | 07d24b1f27a7 |
children | ac37a5f7e5be |
comparison
equal
deleted
inserted
replaced
5365:dbae25a8949d | 5366:f00192e1cd49 |
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821 (defun byte-optimize-identity (form) | 821 (defun byte-optimize-identity (form) |
822 (if (and (cdr form) (null (cdr (cdr form)))) | 822 (if (and (cdr form) (null (cdr (cdr form)))) |
823 (nth 1 form) | 823 (nth 1 form) |
824 (byte-compile-warn "identity called with %d arg%s, but requires 1" | 824 (byte-compile-warn "identity called with %d arg%s, but requires 1" |
825 (length (cdr form)) | 825 (length (cdr form)) |
826 (if (= 1 (length (cdr form))) "" "s")) | 826 (if (eql 1 (length (cdr form))) "" "s")) |
827 form)) | 827 form)) |
828 | 828 |
829 (defun byte-optimize-car (form) | 829 (defun byte-optimize-car (form) |
830 (let ((arg (cadr form))) | 830 (let ((arg (cadr form))) |
831 (cond | 831 (cond |
1019 ((or (nth 3 form) (nthcdr 4 form)) | 1019 ((or (nth 3 form) (nthcdr 4 form)) |
1020 (list 'if | 1020 (list 'if |
1021 ;; Don't make a double negative; | 1021 ;; Don't make a double negative; |
1022 ;; instead, take away the one that is there. | 1022 ;; instead, take away the one that is there. |
1023 (if (and (consp clause) (memq (car clause) '(not null)) | 1023 (if (and (consp clause) (memq (car clause) '(not null)) |
1024 (= (length clause) 2)) ; (not xxxx) or (not (xxxx)) | 1024 (eql (length clause) 2)) ; (not xxxx) or (not (xxxx)) |
1025 (nth 1 clause) | 1025 (nth 1 clause) |
1026 (list 'not clause)) | 1026 (list 'not clause)) |
1027 (if (nthcdr 4 form) | 1027 (if (nthcdr 4 form) |
1028 (cons 'progn (nthcdr 3 form)) | 1028 (cons 'progn (nthcdr 3 form)) |
1029 (nth 3 form)))) | 1029 (nth 3 form)))) |
1161 (list 'let* (reverse (cdr binds)) (nth 1 (car binds)) nil))))) | 1161 (list 'let* (reverse (cdr binds)) (nth 1 (car binds)) nil))))) |
1162 | 1162 |
1163 | 1163 |
1164 (put 'nth 'byte-optimizer 'byte-optimize-nth) | 1164 (put 'nth 'byte-optimizer 'byte-optimize-nth) |
1165 (defun byte-optimize-nth (form) | 1165 (defun byte-optimize-nth (form) |
1166 (if (and (= (safe-length form) 3) (memq (nth 1 form) '(0 1))) | 1166 (if (and (eql (safe-length form) 3) (memq (nth 1 form) '(0 1))) |
1167 (list 'car (if (zerop (nth 1 form)) | 1167 (list 'car (if (zerop (nth 1 form)) |
1168 (nth 2 form) | 1168 (nth 2 form) |
1169 (list 'cdr (nth 2 form)))) | 1169 (list 'cdr (nth 2 form)))) |
1170 (byte-optimize-predicate form))) | 1170 (byte-optimize-predicate form))) |
1171 | 1171 |
1172 (put 'nthcdr 'byte-optimizer 'byte-optimize-nthcdr) | 1172 (put 'nthcdr 'byte-optimizer 'byte-optimize-nthcdr) |
1173 (defun byte-optimize-nthcdr (form) | 1173 (defun byte-optimize-nthcdr (form) |
1174 (if (and (= (safe-length form) 3) (not (memq (nth 1 form) '(0 1 2)))) | 1174 (if (and (eql (safe-length form) 3) (not (memq (nth 1 form) '(0 1 2)))) |
1175 (byte-optimize-predicate form) | 1175 (byte-optimize-predicate form) |
1176 (let ((count (nth 1 form))) | 1176 (let ((count (nth 1 form))) |
1177 (setq form (nth 2 form)) | 1177 (setq form (nth 2 form)) |
1178 (while (>= (setq count (1- count)) 0) | 1178 (while (>= (setq count (1- count)) 0) |
1179 (setq form (list 'cdr form))) | 1179 (setq form (list 'cdr form))) |