rajamesandClaude Opus 5.5
54e1cdafb1
UM* parked its three corrections (c_hi, c_lo, t0) on the return stack before the +* loop, leaving its caller 4 return entries. Now u1 and u2 wait on the data stack under the loop -- +* touches only T, S and A -- and the corrections are made after it, with -if in place of 0< calls. The return stack holds the loop count, then at most two temporaries. The loop count is pushed before s is made, so the data stack never holds more than four cells: data headroom is unchanged at 6. Headroom (data cells under args / return entries): 6/4 -> 6/6. Q.*, which calls UM* four times, goes from 2/1 to 2/2. Same checks as before at 32- and 64-bit cells, optimised and ASan+UBSan; breaking any of the four corrections fails 4900+ checks. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
v4/
StarForth v4: the 32-instruction F18-derived core. The design lives in
docs/v4.0.0/JUSTIFICATION.md (why) and docs/v4.0.0/DECOMPOSITION.md
(every v3 word mapped to a v4 fate).
The first deliverable is the hosted C99 golden model (JUSTIFICATION.md §10,
step 1). It must pass POST and hold K≡1.0 with 32- and 64-bit cells on all
three host ISAs.
What exists so far is the single node: registers, circular stacks, memory, all
32 opcodes, and per-opcode and per-call-target heat. make -C v4 test builds
and runs the tests at both cell widths; make -C v4 sanitize repeats them
under ASan and UBSan. There is no compiler capsule, no POST and no K
measurement yet.