[Bug c/104711] Unnecessary -Wshift-negative-value warning

[segher at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104711

--- Comment #4 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Created attachment 52522
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52522&action=edit
testcase