rajamesandClaude Opus 5.5
8235078b3b
Q.COS is v3's q48_cos_approx: on |(Q.REDUCE) x|, the even Taylor series to n = 10. It sets term and sum to 1.0, n to 2 and the sign cell to 0, then jumps into Q.SIN's loop, so it adds no call level. Checked bit for bit against v3's q48_cos_approx (ported into the test) on the same 33 edge angles and 3000 pseudo-random angles as Q.SIN, at 32- and 64-bit cells, optimised and ASan+UBSan (`make test`, `make sanitize`). Mutating the start index, the start sum, the alternation or the sign cell each fails 2500+ cosine checks and no sine checks. Headroom (data under arg / return): Q.COS 3/2. Test results on the amd64 host only. This is a development check, not acceptance (JUSTIFICATION.md section 16). 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.
Acceptance (JUSTIFICATION.md §16): v4 must be equivalent to v3 at any point
in time, with the same vocabularies and behaviour, on the F18-derived engine;
and every ISA, hosted and bare metal, must still reach its ok prompt.
make -C v4 test passing is a development check, not acceptance.
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.