[Issue 21363] [REG2.094] Implementation of core.bitop.ror(x,0) is using UB

d-bugmail at puremagic.com d-bugmail at puremagic.com
Wed May 12 16:37:33 UTC 2021


https://issues.dlang.org/show_bug.cgi?id=21363

--- Comment #3 from Dlang Bot <dlang-bot at dlang.rocks> ---
dlang/druntime pull request #3468 "merge stable" was merged into master:

- fdda230e2a41ba4723a424f31cf29b99e705b4ec by Chigusa0w0:
  Fix Issue 21363 - [REG2.094] Implementation of core.bitop.ror(x,0) is using
UB

  This is a quick fix to Issue 21363. When `count` is set to `0`, `T.sizeof * 8
- count` will always be `T.sizeof * 8` therefore fails compiler check here:
 
https://github.com/dlang/dmd/blob/81f9f57257da8733cf741355524bb8a3ec9c45ce/src/dmd/dinterpret.d#L3018-L3024

https://github.com/dlang/druntime/pull/3468

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