fabi/xenia-rs
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

chore: add migration/ bundle for cross-machine setup

Browse Source 
Bundles state that lives OUTSIDE the xenia-rs repo so a fresh clone on
another machine can be brought up to identical configuration via
migration/setup.sh:

  - claude-memory/             ~/.claude/projects/-home-fabi-RE-Project-Sylpheed/memory/
                               (103 files, 1.1 MB - MEMORY.md + every
                                project_xenia_rs_*.md from audits
                                addis_signext through audit-058)
  - project-root/dot-claude/   <project-root>/.claude/settings.json
                               (Stop hook + permissions)
  - project-root/ppc-manual/   <project-root>/ppc-manual/
                               (PowerPC reference docs, 397 files, 3.7 MB)
  - project-root/run-canary.sh <project-root>/run-canary.sh
  - README.md                  Human-readable setup checklist
  - setup.sh                   Idempotent installer (also reclones
                               xenia-canary at pinned HEAD 6de80dffe)
  - MANIFEST.md                Per-file mapping + per-file-not-bundled
                               restoration recipe

Excluded from bundle (not shippable via git):
  - Sylpheed ISO (7.8 GB; copyright; manual copy required)
  - sylpheed.db (395 MB; regenerable from XEX via analysis tooling)
  - target/ build artifacts (rebuild on target)
  - audit-runs probe firehoses (.log/.stdout/.stderr ~11 GB; rerun if needed)
  - audit-runs memory dumps (.bin ~4.5 GB; rerun audit-026/027/029 if needed)
  - xenia-canary checkout (setup.sh reclones from
    git.mc02.dev/fabi/Xenia-Canary.git at HEAD 6de80dffe)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
MechaCat02
2026-05-10 21:38:38 +02:00
parent 8e709b0a24
commit e6d43a23ac
505 changed files with 86028 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

136
migration/project-root/ppc-manual/vmx/vmulesb.md Normal file
View File

@@ -0,0 +1,136 @@
# `vmulesb` — Vector Multiply Even Signed Byte
> **Category:** [VMX (Altivec)](../categories/vmx.md) · **Form:** [VX](../forms/VX.md) · **Opcode:** `0x10000308`
<!-- GENERATED: BEGIN -->
## Assembler Mnemonics
| Mnemonic | XML entry | Flags | Description |
| --- | --- | --- | --- |
| `vmulesb` | `vmulesb` | — | Vector Multiply Even Signed Byte |
## Syntax
```asm
vmulesb [VD], [VA], [VB]
```
## Encoding
### `vmulesb` — form `VX`
- **Opcode word:** `0x10000308`
- **Primary opcode (bits 0–5):** `4`
- **Extended opcode:** `776`
- **Synchronising:** no
| Bits | Field | Meaning |
| --- | --- | --- |
| 0–5 | `OPCD` | primary opcode (4) |
| 6–10 | `VRT/VD` | destination vector register |
| 11–15 | `VRA/VA` | source A vector register |
| 16–20 | `VRB/VB` | source B vector register |
| 21–31 | `XO` | extended opcode (11 bits) |
## Operands
| Field | Role | Description |
| --- | --- | --- |
| `VA` | vmulesb: read | Source A vector register. |
| `VB` | vmulesb: read | Source B vector register. |
| `VD` | vmulesb: write | Destination vector register. |
## Register Effects
### `vmulesb`
- **Reads (always):** `VA`, `VB`
- **Reads (conditional):** _none_
- **Writes (always):** `VD`
- **Writes (conditional):** _none_
## Status-Register Effects
_No condition-register or status-register effects._
## Operation (pseudocode)
```
; Pseudocode derives directly from the xenia-rs interpreter
; arm (see Implementation References). Operation semantics:
; - Read source operands from the fields listed under Operands.
; - Apply the arithmetic / logical / memory action described
; in the Description field above.
; - Write results to the destination register(s); update any
; status bits enumerated under Status-Register Effects.
; Consult the IBM AIX reference link under IBM Reference for
; canonical PPC-style pseudocode where xenia's expression is
; terse.
```
## C Translation Example
```c
/* C translation: the xenia-rs interpreter arm below in */
/* Implementation References is the authoritative semantic */
/* snapshot. Translate it line-by-line: */
/* - ctx.gpr[N] -> r[N] (or f[]/v[] for FPRs/VRs) */
/* - mem.read_u*/write_u* -> mem_read_u*_be / mem_write_u*_be */
/* - ctx.update_cr_signed(fld, v) -> update_cr_signed(fld, v) */
/* - ctx.xer_ca / xer_ov / xer_so -> xer.CA / xer.OV / xer.SO */
/* The Register Effects and Status-Register Effects tables above */
/* enumerate every side effect a faithful translation must emit. */
```
## Implementation References
**`vmulesb`**
- xenia-canary XML: [`tools/ppc-instructions.xml` — search for `mnem="vmulesb"`](../../xenia-canary/tools/ppc-instructions.xml)
- xenia-canary emit: [`src/xenia/cpu/ppc/ppc_emit_altivec.cc:1086`](../../xenia-canary/src/xenia/cpu/ppc/ppc_emit_altivec.cc#L1086)
- xenia-rs opcode: [`crates/xenia-cpu/src/opcode.rs:108`](../../xenia-rs/crates/xenia-cpu/src/opcode.rs#L108)
- xenia-rs decoder: [`crates/xenia-cpu/src/decoder.rs:501`](../../xenia-rs/crates/xenia-cpu/src/decoder.rs#L501)
- xenia-rs interpreter: [`crates/xenia-cpu/src/interpreter.rs:3469-3476`](../../xenia-rs/crates/xenia-cpu/src/interpreter.rs#L3469-L3476)
<details><summary>xenia-rs interpreter body (frozen snapshot)</summary>
```rust
PpcOpcode::vmulesb => {
let a = crate::vmx::as_i8x16(ctx.vr[instr.ra()]);
let b = crate::vmx::as_i8x16(ctx.vr[instr.rb()]);
let mut r = [0i16; 8];
for i in 0..8 { r[i] = a[2 * i] as i16 * b[2 * i] as i16; }
ctx.vr[instr.rd()] = crate::vmx::from_i16x8(r);
ctx.pc += 4;
}
```
</details>
<!-- GENERATED: END -->
## Special Cases & Edge Conditions
- **Even-byte signed multiply, half-word result.** Per output half lane:
```
VD[i] = int16(int8(VA[2*i]) * int8(VB[2*i])) ; for i = 0..7
```
Only the eight **even-indexed** byte lanes (lanes 0, 2, 4, …, 14 in big-endian) are read from each source. Each `int8 × int8` product is widened to `int16`, producing eight half-word results that fill all of `VD`.
- **No saturation, no `VSCR[SAT]`.** The full 16-bit product of two signed bytes always fits in `int16` (range `-127*-128 = +16256 .. +127*+127 = +16129` is well within `±32767`), so no clipping is needed — even at the bit-pattern extremes `(-128) * (-128) = +16384` is representable.
- **Pairs with [`vmulosb`](vmulosb.md)** (odd-byte sibling). Together they consume all 16 bytes; two instructions are needed for a "multiply every lane" 16×16-bit byte multiply.
- **Big-endian byte indexing.** Even byte indices `0, 2, 4, …, 14` correspond to the high-order halves of each half-word slot.
- **No XER, no exceptions.**
- **Aliasing legal.**
- **No VMX128 sibling.**
- **Common usage.** Signed-coefficient byte multiply for image filters; first half of a 16-byte signed multiply when paired with `vmulosb`.
## Related Instructions
- [`vmulosb`](vmulosb.md) — odd-byte sibling (lanes 1, 3, …, 15).
- [`vmuleub`](vmuleub.md), [`vmuloub`](vmuloub.md) — same split, unsigned.
- [`vmulesh`](vmulesh.md), [`vmulosh`](vmulosh.md) — same family at half width (→ word results).
- [`vmladduhm`](vmladduhm.md) — per-lane modulo multiply-add (low half only).
- [`vpkshus`](vpkshus.md) — saturating pack down from `int16` halves to `uint8` bytes (combine with `vmule*` for "scale + clamp" pipelines).
## IBM Reference
- [AIX 7.3 — `vmulesb` (Vector Multiply Even Signed Byte)](https://www.ibm.com/docs/en/aix/7.3.0?topic=set-vmulesb-vector-multiply-even-signed-byte-instruction)
- [IBM AltiVec Technology Programmer's Interface Manual, Chapter 6 — Multiply Family](https://www.nxp.com/docs/en/reference-manual/ALTIVECPIM.pdf)