rangeify assigns ranges backward from consumers and CALL contributes none,
so the subgraph above a custom kernel input gets no ranges unless something
in it is realized, and reduce conversion crashes with a KeyError. realize
call inputs that don't resolve to a buffer state.
only view-only movement ops preserve the underlying buffer: anything
computed (ALU, REDUCE, ...) must be realized even if one of its sources
resolves to a buffer, since the whole subgraph above the call has no
ranges. unwrapping src[0] unconditionally missed const branches hanging
off non-src[0] children and silently resolved REDUCEs to their source
buffer. includes regression tests for pure const, mixed buffer+const, and
view-over-buffer inputs
geohot
92acbc3ac4