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[iterate-4A] diagnostics: XENIA_PROFILE wall-time profiler + probe/tooling snapshot

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Handoff snapshot of the env-gated diagnostic scaffolding used across the
intro-video RE. Kept out of the milestone commits (645feb8..5573ac1) to keep
those clean; committed here so nothing is lost on handoff.

New — XENIA_PROFILE wall-time profiler (crates/xenia-gpu/src/prof.rs):
  Coarse buckets attributing playback wall time to interpreter (step_block),
  kernel HLE (call_export), block decode/cache (lookup_or_build), texture
  decode, host draw, and present; prints periodic snapshots (every 500M guest
  instr, or every 500 presents) + a clean-exit report. Hot path is gated on a
  cached is_on() (one relaxed load) so it is zero-cost when XENIA_PROFILE is
  unset. Call sites: main.rs run_superblock / parallel worker (step_block,
  lookup_or_build, call_export), texture_cache ensure_cached, render.rs present
  + dispatch_xenos_draws.

  First profile (movie playback, headless single-thread lockstep): effective
  ~35 MIPS; interpreter body ~40% @ ~95-102 MIPS; texture decode 0.3% (cache
  works); present ~0%; the rest is per-block dispatch + scheduler plumbing
  (~13 instr/block over 229M blocks). Overhead-bound, not interpreter-body
  bound; the levers are coarser execution units (superblock chaining) and
  ultimately a JIT.

Pre-existing read-only probe knobs (were uncommitted; env-gated, observe-only):
  XENIA_RET_CAPTURE_PC/_REG/_MEM, LOG_RESUMES, LOG_WAITS, LOG_SIGNAL,
  FORCE_TID, STARVE_LIMIT, INCUMBENT_PICK, INSTR_PER_MS, DUMP_FRAME,
  DUMP_WGSL, BIND_LOG, CONST_LOG, DISPATCH_REC, AUDIT_PC_TRACE.

Tooling: sylph-run.sh (movie oracle loop, 180s default timeout),
  zq.py (DuckDB disasm/xref helper).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
MechaCat02
2026-07-03 07:43:53 +02:00
parent 5573ac1c43
commit 2c883e9d5e
13 changed files with 800 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
crates/xenia-gpu/src/translator.rs
View File

@@ -460,6 +460,16 @@ impl EmitCtx {
let b = src_operand(alu.src_b, alu.src_b_is_temp, alu.src_b_swiz, alu.src_b_negate, const_base);
let c = src_operand(alu.src_c, alu.src_c_is_temp, alu.src_c_swiz, alu.src_c_negate, const_base);
if (42..=47).contains(&alu.scalar_opcode) && std::env::var("XENIA_SC_LOG").is_ok() {
eprintln!(
"SC-OP opc={} sa={} atmp={} asw={:#04x} sb={} btmp={} bsw={:#04x} sc={} ctmp={} csw={:#04x}",
alu.scalar_opcode,
alu.src_a, alu.src_a_is_temp as u8, alu.src_a_swiz,
alu.src_b, alu.src_b_is_temp as u8, alu.src_b_swiz,
alu.src_c, alu.src_c_is_temp as u8, alu.src_c_swiz,
);
}
// Vector pipe.
if alu.vector_write_mask != 0 {
let expr = vector_expr(alu.vector_opcode, &a, &b, &c)
@@ -501,6 +511,9 @@ impl EmitCtx {
let expr = match scalar_expr(alu.scalar_opcode, &scl_src_a, &scl_src_b, "ps") {
Some(e) => e,
None => {
if std::env::var("XENIA_BIND_LOG").is_ok() {
eprintln!("SCL-UNSUPPORTED opcode={:#04x} ({})", alu.scalar_opcode, alu.scalar_opcode);
}
return Err(reject::SCL_OP_UNSUPPORTED);
}
};