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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
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# `vmulfp128` — Vector128 Multiply Floating-Point
> **Category:** [VMX128](../categories/vmx128.md) · **Form:** [VX128](../forms/VX128.md) · **Opcode:** `0x14000090`
<!-- GENERATED: BEGIN -->
## Assembler Mnemonics
| Mnemonic | XML entry | Flags | Description |
| --- | --- | --- | --- |
| `vmulfp128` | `vmulfp128` | — | Vector128 Multiply Floating-Point |
## Syntax
```asm
vmulfp128 [VD], [VA], [VB]
```
## Encoding
### `vmulfp128` — form `VX128`
- **Opcode word:** `0x14000090`
- **Primary opcode (bits 0–5):** `5`
- **Extended opcode:** `144`
- **Synchronising:** no
| Bits | Field | Meaning |
| --- | --- | --- |
| 0–5 | `OPCD` | primary opcode (4 or 5) |
| 6–10 | `VD128l` | destination low 5 bits |
| 11–15 | `VA128l` | source A low 5 bits |
| 16–20 | `VB128l` | source B low 5 bits |
| 21 | `VA128H` | source A high bit |
| 22 | `—` | reserved |
| 23–25 | `VC` | optional VC / XO sub-field |
| 26 | `VA128h` | source A middle bit |
| 27 | `—` | reserved |
| 28–29 | `VD128h` | destination high 2 bits |
| 30–31 | `VB128h` | source B high 2 bits |
## Operands
| Field | Role | Description |
| --- | --- | --- |
| `VA` | vmulfp128: read | Source A vector register. |
| `VB` | vmulfp128: read | Source B vector register. |
| `VD` | vmulfp128: write | Destination vector register. |
## Register Effects
### `vmulfp128`
- **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
**`vmulfp128`**
- xenia-canary XML: [`tools/ppc-instructions.xml` — search for `mnem="vmulfp128"`](../../xenia-canary/tools/ppc-instructions.xml)
- xenia-canary emit: [`src/xenia/cpu/ppc/ppc_emit_altivec.cc:1126`](../../xenia-canary/src/xenia/cpu/ppc/ppc_emit_altivec.cc#L1126)
- 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:612`](../../xenia-rs/crates/xenia-cpu/src/decoder.rs#L612)
- xenia-rs interpreter: [`crates/xenia-cpu/src/interpreter.rs:2108-2120`](../../xenia-rs/crates/xenia-cpu/src/interpreter.rs#L2108-L2120)
<details><summary>xenia-rs interpreter body (frozen snapshot)</summary>
```rust
PpcOpcode::vmulfp128 => {
// PPCBUG-435 + PPCBUG-437.
let a = ctx.vr[instr.va128()].as_f32x4();
let b = ctx.vr[instr.vb128()].as_f32x4();
let mut r = [0f32; 4];
for i in 0..4 {
let ai = vmx::flush_denorm(a[i]);
let bi = vmx::flush_denorm(b[i]);
r[i] = vmx::flush_denorm(ai * bi);
}
ctx.vr[instr.vd128()] = xenia_types::Vec128::from_f32x4_array(r);
ctx.pc += 4;
}
```
</details>
<!-- GENERATED: END -->
## Special Cases & Edge Conditions
- **Lane-wise float multiply — Xenon-only.** Base Altivec has no dedicated `vmulfp`; the pattern on traditional PowerPC is `vmaddfp vD, vA, vC, v_zero`. Xenon adds this direct instruction, saving the zero-register setup.
- **IEEE-754 binary32, round-to-nearest.** Each of the four lanes computes `VD[i] = VA[i] * VB[i]`.
- **`VSCR[NJ]` honoured** (denormals flush-to-zero).
- **NaN propagation** per IEEE-754.
- **No VSCR[SAT], no FPSCR update, no exceptions.**
- **VMX128 register-fusion** (7-bit IDs).
- **No IBM AIX entry** — Xbox-specific; contrast with the `vmaddfp`-with-zero workaround used on non-Xenon Altivec.
- **No `Rc`, no XER.**
## Related Instructions
- [`vmaddfp`](../vmx/vmaddfp.md), [`vmaddcfp128`](vmaddcfp128.md) — fused MAC forms.
- [`vaddfp`](../vmx/vaddfp.md), [`vsubfp`](../vmx/vsubfp.md) — lane-wise float add/sub.
- [`vmsum3fp128`](vmsum3fp128.md), [`vmsum4fp128`](vmsum4fp128.md) — dot-product reductions.
## IBM Reference
- No IBM AIX entry — this instruction is exclusive to the Xbox 360's VMX128 extension.
- Xbox 360 XDK, Altivec-128 (VMX128) extensions. Non-Xenon Altivec code emits `vmaddfp vD, vA, vC, v_zero` to achieve the same effect.
- [IBM AltiVec Technology Programmer's Interface Manual §`vmaddfp`](https://www.nxp.com/docs/en/reference-manual/ALTIVECPIM.pdf) for the underlying float semantics.