1 ;;;; cross-compile-time-only replacements for modular functions;
2 ;;;; needed for constant-folding
4 ;;;; This software is part of the SBCL system. See the README file for
7 ;;;; This software is derived from the CMU CL system, which was
8 ;;;; written at Carnegie Mellon University and released into the
9 ;;;; public domain. The software is in the public domain and is
10 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
11 ;;;; files for more information.
15 (defun mask-signed-field (size integer)
18 ((logbitp (1- size) integer)
19 (dpb integer (byte size 0) -1))
21 (ldb (byte size 0) integer))))
25 (flet ((definition (name lambda-list prototype width)
26 `(defun ,name ,lambda-list
27 (ldb (byte ,width 0) (,prototype ,@lambda-list)))))
28 (loop for infos being each hash-value of (modular-class-funs *unsigned-modular-class*) using (hash-key prototype)
30 do (loop for info in infos
31 for name = (modular-fun-info-name info)
32 and width = (modular-fun-info-width info)
33 and lambda-list = (modular-fun-info-lambda-list info)
34 do (forms (definition name lambda-list prototype width)))))
39 (flet ((definition (name lambda-list prototype width)
40 `(defun ,name ,lambda-list
41 (mask-signed-field ,width (,prototype ,@lambda-list)))))
42 (loop for infos being each hash-value of (modular-class-funs *signed-modular-class*) using (hash-key prototype)
44 do (loop for info in infos
45 for name = (modular-fun-info-name info)
46 and width = (modular-fun-info-width info)
47 and lambda-list = (modular-fun-info-lambda-list info)
48 do (forms (definition name lambda-list prototype width)))))
51 #!+#.(cl:if (cl:= sb!vm:n-machine-word-bits 32) '(and) '(or))
52 (defun sb!vm::ash-left-mod32 (integer amount)
53 (ldb (byte 32 0) (ash integer amount)))
54 #!+#.(cl:if (cl:= sb!vm:n-machine-word-bits 64) '(and) '(or))
55 (defun sb!vm::ash-left-mod64 (integer amount)
56 (ldb (byte 64 0) (ash integer amount)))
58 (defun sb!vm::ash-left-smod30 (integer amount)
59 (mask-signed-field 30 (ash integer amount)))
61 (defun sb!vm::ash-left-smod61 (integer amount)
62 (mask-signed-field 61 (ash integer amount)))