reed kotler <rkot...@mips.com> writes: > For extended inline assembly, there are constraints. Some seem to be > supported by all architectures and some specific to a particular > architecture. > > Where are these defined in gcc source? > > Some seem to be in constraints.md and some not.
Machine-specific constraints are normally defined in, as you say, config/CPU/constraints.md. The generic constraints are handled in a few different places, notably ira-*.c, reload.c and recog.c. Probably the easiest way to find them is to grep for REG_CLASS_FROM_CONSTRAINT and check the code around the places where that is used. Ian
