Hi!
Trying to implement bit-fields for MesCC, I stumble upon this. I was
looking for a bitwise left shift that introduces 1's instead of zeros.
This code
--8<---------------cut here---------------start------------->8---
;; foo.scm
(let* ((set-mask (pk 'set-mask (ash 3 3)))
(clear-mask (pk 'clear-mask (logxor set-mask -1))))
(pk 'expected (logxor 24 -1))
(display clear-mask)
(newline)
clear-mask)
--8<---------------cut here---------------end--------------->8---
behaves as I expect when compilation is turned off (compile or
auto-compile behave alike for me)
--8<---------------cut here---------------start------------->8---
19:50:43 janneke@dundal:~/src/mes
$ guile --no-auto-compile foo.scm
;;; (set-mask 24)
;;; (clear-mask -25)
;;; (expected -25)
-25
--8<---------------cut here---------------end--------------->8---
but when (auto)compiled, look:
--8<---------------cut here---------------start------------->8---
19:50:47 janneke@dundal:~/src/mes
$ guile foo.scm
;;; note: auto-compilation is enabled, set GUILE_AUTO_COMPILE=0
;;; or pass the --no-auto-compile argument to disable.
;;; compiling /home/janneke/src/mes/foo.scm
;;; compiled
/home/janneke/.cache/guile/ccache/2.2-LE-8-3.A/home/janneke/src/mes/foo.scm.go
;;; (set-mask 24)
;;; (clear-mask -1)
;;; (expected -25)
-1
--8<---------------cut here---------------end--------------->8---
I'm using guile-2.2.3 from Guix master.
Is this a bug, can you suggest a workaround?
Greetings,
janneke
--
Jan Nieuwenhuizen <jann...@gnu.org> | GNU LilyPond http://lilypond.org
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