Robert Allan JamesandClaude Sonnet 5
1a716c8048
d_compare() (double_words.c), the static helper backing DMAX/DMIN/D</D=,
had the same bare-unsigned-long pattern already fixed in D+/D-/DNEGATE
(commit bea8d74) -- 32-bit unsigned long on this aarch64 target silently
truncating the low-cell comparison. Switched to ucell_t.
Verified with four cases designed specifically to expose the old
truncation: two doubles sharing the same high cell but with low cells
differing only in bits 32-63 (invisible to a 32-bit-truncated compare,
e.g. 2^32 vs 0):
4294967296 0 0 0 D= . -> 0 (correctly not equal)
4294967296 0 0 0 DMIN SWAP D. -> 0 (correctly picks the smaller)
0 0 4294967296 0 D< . -> -1 (correct)
4294967296 0 0 0 D< . -> 0 (correct)
All four pass identically on amd64, aarch64, and riscv64. These cases
were never run before this fix -- the exerciser campaign never touched
DMAX/DMIN/D</D= at all, so this is the first real evidence d_compare()
was ever exercised on any architecture. Full 24-case exerciser also
reran clean on all three architectures (no regression).
D2*/D2/ use unsigned long long (C-standard-guaranteed >=64-bit) and were
never part of this bug class. All four affected words (D+, D-, DNEGATE,
d_compare) are now fixed; M*'s separate universal DOUBLE-OVERFLOW bug
remains open (unrelated defect, out of scope here).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EXieurDfDSsDFdnSyusuWo
capsules/
FORTH personality files loaded by the VM at boot. A capsule is an immutable, content-addressed payload; its XXHash64 hash is its identity. Any mutation changes the hash and the birth protocol rejects the image.
Key files
| File | Type | Purpose |
|---|---|---|
init.4th |
(m) MAMA_INIT |
Default Mama VM personality — loaded at LBN 2048 |
ACL.4th |
user | Word-level ACL system; self-activating at boot |
zuse.4th |
user | Bootstrap superuser; loaded by ACL.4th |
doe.4th |
user | DoE workload words (EXEC-DOE) — opt-in |
init-0.4th … init-9.4th |
(p) |
Numbered personality variants |
init-l8-*.4th |
(p) |
L8 Jacquard mode variants (stable/volatile/diverse/temporal/transition/omni) |
hermes/init.4th |
(p) |
Hermes baby VM personality |
artemis/init.4th |
(p) |
Artemis baby VM personality |
Block namespace
Block ranges are shared across all loaded capsules — collisions cause silent word-definition overwrites.
| Range | Owner |
|---|---|
| 2048–2099 | init.4th |
| 2100–2199 | doe.4th |
| 3000–3999 | workload capsules |
| 4000+ | user-defined (ACL.4th, zuse.4th, …) |
Each block is limited to 1024 bytes. Verify with wc -c before committing.
See also
experiments/bare_metal/README.md— DoE protocols and block namespace rulesdocs/03-architecture/word-acl/DESIGN.md— ACL system designtools/mkcapsule.c— assembles capsules intocapsule_generated.c- Project root