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Constant-propagate access to captured variables

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* lisp/emacs-lisp/byte-opt.el (byte-optimize--substitutable-p):
Treat (internal-get-closed-var N) as constants for propagation
purposes, because that is effectively what such forms will be compiled
to.  This allows for the elimination of some lexical variables.

* test/lisp/emacs-lisp/bytecomp-tests.el (bytecomp-tests--test-cases):
Add test case.
This commit is contained in:
Mattias Engdegård 2021-12-11 22:11:08 +01:00
parent 36cd4f5d81
commit 8716f21d94
2 changed files with 12 additions and 2 deletions
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8
lisp/emacs-lisp/byte-opt.el
View file

@ -342,8 +342,12 @@ for speeding up processing.")
(numberp expr)
(stringp expr)
(and (consp expr)
(memq (car expr) '(quote function))
(symbolp (cadr expr)))
(or (and (memq (car expr) '(quote function))
(symbolp (cadr expr)))
;; (internal-get-closed-var N) can be considered constant for
;; const-prop purposes.
(and (eq (car expr) 'internal-get-closed-var)
(integerp (cadr expr)))))
(keywordp expr)))
(defmacro byte-optimize--pcase (exp &rest cases)

6
test/lisp/emacs-lisp/bytecomp-tests.el
View file

@ -686,6 +686,12 @@ inner loops respectively."
(let* ((x 'a))
(list x (funcall g) (funcall h)))))))
(funcall (funcall f 'b)))
;; Test constant-propagation of access to captured variables.
(let* ((x 2)
(f (lambda ()
(let ((y x)) (list y 3 y)))))
(funcall f))
)
"List of expressions for cross-testing interpreted and compiled code.")