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| author | Mattias Engdegård <mattiase@acm.org> | 2021-08-05 11:50:25 +0200 |
|---|---|---|
| committer | Mattias Engdegård <mattiase@acm.org> | 2021-08-05 15:33:05 +0200 |
| commit | 2a17925aab75735b40f9b0ccaab4c46f6b9a9a32 (patch) | |
| tree | 9bf4f3c62e87cc85f7588626be46845afb19a1cb /test/lisp/emacs-lisp/memory-report-tests.el | |
| parent | 2d8c14d299600c08751bfb978883c9f1b7141555 (diff) | |
| download | emacs-2a17925aab75735b40f9b0ccaab4c46f6b9a9a32.tar.gz emacs-2a17925aab75735b40f9b0ccaab4c46f6b9a9a32.tar.bz2 emacs-2a17925aab75735b40f9b0ccaab4c46f6b9a9a32.zip | |
Cease attempts to const-propagate through setq
The current method of propagating constants through setq was unsound
because it relied on each setq form only being traversed at most once
during optimisation, which isn't necessarily true in general; it could
be made to miscompile code in rare cases.
Since it was only used in limited circumstances, disabling this
optimisation doesn't cost us much.
* lisp/emacs-lisp/byte-opt.el (byte-optimize-form-code-walker):
Don't update the known value when traversing `setq`.
* test/lisp/emacs-lisp/bytecomp-tests.el (bytecomp-tests--test-cases):
Add test case.
Diffstat (limited to 'test/lisp/emacs-lisp/memory-report-tests.el')
0 files changed, 0 insertions, 0 deletions