[Bug rtl-optimization/82677] Many projects (linux, coreutils, GMP, gcrypt, openSSL, etc) are misusing asm(divq/divl) etc, potentially resulting in faulty/unintended optimisations

[nisse at lysator dot liu.se]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82677

--- Comment #12 from Niels Möller <nisse at lysator dot liu.se> ---
It would be nice with some way to annotate the asm to have it treated in the
same as a possibly trapping division or pointer dereference.

E.g., adding "trap" to the clobber list, somewhat similar to "memory". This
would be a weaker constraint than volatile, since it would allow the compiler
to reorder the asm relative to other instructions, including loads and stores,
but it can't move it out of a conditional. 

Do you think that's a reasonable addition?