https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103926
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Alexey Kardashevskiy from comment #3) > Documented here: > https://dmalcolm.fedorapeople.org/gcc/2015-08-31/rst-experiment/how-to-use- > inline-assembly-language-in-c-code.html Not documented in user's manual though: https://gcc.gnu.org/onlinedocs/gcc-11.2.0/gcc/Machine-Constraints.html#Machine-Constraints It is documented in the internals manual which is be expected (it is not supposed to be used by the user): https://gcc.gnu.org/onlinedocs/gccint/Machine-Constraints.html#Machine-Constraints
