https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85323
--- Comment #1 from Matthias Kretz <kretz at kde dot org> --- Created attachment 43898 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43898&action=edit idea for a partial solution Constant propagation works using the built in shift operators. At least for the shifts taking a "const int" shift argument, this is a possible fix. However, the patched intrinsics now accept non-immediate shift arguments, which modifies the interface (in an unsafe way).
