Host code fixtures #

gen.sh makes <f>_x86_64.o and <f>_aarch64.o from <f>.c for each <f>:

• spin, the bench's fill that counts to the word its argument points at, as work that takes a device a known while.
• fill, which stores its second parameter at the address in its first; fill_indirect follows that address once more; fill_empty accepts no parameters; fill_call reads a host entry from the container in its first parameter and calls it on the buffer in its second. fill_x86_64_windows.o defines them by Windows' convention, by which rig calls a fill there.