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fix(v4.0.0): MOVE follows FORTH-79

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MOVE moves n cells, the cell at addr1 first, and nothing for n <= 0.
v3's moved bytes like memmove; CMOVE and CMOVE> do that.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
rajames
2026-10-04 08:47:29 -04:00
co-authored by Claude Opus 5.5
parent e178a76c36
commit b137678691
2 changed files with 34 additions and 23 deletions
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docs/v4.0.0/DECOMPOSITION.md
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@@ -334,7 +334,7 @@ Section numbers match the v3 primitive reference.
| `C@` | CAP | See below (D-1). Call-free. Executed on the golden model (2026-10-03). Leaves its caller 8 data cells and 7 return entries. |
| `C!` | CAP | See below (D-1). Call-free. Executed on the golden model (2026-10-03). |
| `FILL` | CAP | `( baddr u c -- )`: the low byte of `c`. See below. Nothing for `u = 0`; for `u < 0` nothing is written and `NODE-ERROR` is set (v3 read a negative count as a huge unsigned one). Executed on the golden model (2026-10-03), including a transcript of the v3 binary. Leaves its caller 5 data cells and 5 return entries. Clobbers `A` and, on error, `B`. |
| `MOVE` | CAP | `( src dst u -- )`, bytes: `push over over - -if UP drop pop jump CMOVE> UP: drop pop jump CMOVE` — `CMOVE>` when `src < dst`, else `CMOVE`, so overlapping bytes are read before they are overwritten, as v3's `memmove`. The test is the sign of `src - dst`, in line. Executed on the golden model (2026-10-03), including a transcript of the v3 binary. Leaves its caller 4 data cells and 5 return entries. |
| `MOVE` | CAP | `( addr1 addr2 n -- )` — FORTH-79 (ruled 2026-10-04): `n` cells from `addr1` to `addr2`, the cell at `addr1` first; nothing for `n <= 0`. The addresses are word addresses (D-1). `-if OK drop drop drop ; OK: if DONE push over a! @ over a! ! 1 + push 1 + pop pop -1 + jump OK DONE: drop drop drop ;` v3's `MOVE` moved bytes, in whichever direction did not overwrite what it had yet to read; that is `CMOVE` and `CMOVE>`. Executed on the golden model (2026-10-04) against C, overlapping both ways. Leaves its caller 6 data cells and 6 return entries. Clobbers `A`. |
| `ERASE` | CAP | `0 FILL`, as `0 jump FILL`. Executed on the golden model (2026-10-03), including a transcript of the v3 binary. |
| `CELLS` | IN | Empty (word-addressed, D-1); v3 answers 24 for `3 CELLS`. Executed on the golden model (2026-10-03). |