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perf: GUID lookup cache (97% hit, 2.6x)

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FindObjectByGUID (0x464890): 4096-entry direct-mapped cache with
validate-on-hit. 97% hit rate at 10K+ calls/frame, reducing from
0.8% to 0.3% frame time. Validates cached pointers by checking
GUID at obj+0x30/+0x34 on every hit.

AddToSpatialGrid (0x6816F0): SSE rewrite attempted, no measurable
gain (memory-bound linked list ops dominate). Not shipped.
This commit is contained in:
MarcelineVQ
2026-03-25 14:46:56 -07:00
parent ad33eb9b90
commit 1f318a8565
4 changed files with 302 additions and 6 deletions
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src/transform44/transform44.zig
+47 -1
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@@ -30,6 +30,8 @@ extern fn performCollisionDetectionSSE(u32, u32, u32) callconv(.{ .x86_thiscall
extern fn updateEntityAndChunksPositions(u32) callconv(.{ .x86_fastcall = .{} }) void;
extern fn updateEntitiesInBoundsSSE(u32, u32) callconv(.{ .x86_thiscall = .{} }) void;
extern fn rayTriIntersectIndexedInt(u32, u32, u32, u32, u32, u32) callconv(.{ .x86_fastcall = .{} }) u8;
extern fn addToSpatialGridSSE(u32) callconv(.{ .x86_fastcall = .{} }) void;
extern fn findObjectByGUID_Cached(u32, u32) callconv(.{ .x86_stdcall = .{} }) u32;
extern fn setupParticleRendering_SSE(u32, u32) callconv(.{ .x86_thiscall = .{} }) void;
extern fn renderSpriteQuads_SSE(u32, u32, u32, u32) callconv(.{ .x86_thiscall = .{} }) void;
extern var stride_info: [8]u32; // exported from particle_sse.zig
@@ -1092,8 +1094,38 @@ fn cbiterDetour(a: u32, b: u32, c: u32, d: u32, e: u32, f: u32) callconv(hook.cc
prof.cbiter_calls +|= 1;
return ret;
}
const GUID_CACHE_BITS = 12;
const GUID_CACHE_SIZE = 1 << GUID_CACHE_BITS;
const GUID_CACHE_MASK = GUID_CACHE_SIZE - 1;
const GuidCacheEntry = struct { guid_lo: u32 = 0, guid_hi: u32 = 0, result: u32 = 0 };
var guid_cache: [GUID_CACHE_SIZE]GuidCacheEntry = [_]GuidCacheEntry{.{}} ** GUID_CACHE_SIZE;
var guid_cache_hits: u64 = 0;
var guid_cache_misses: u64 = 0;
fn findguidDetour(a: u32, b: u32, c: u32, d: u32) callconv(hook.cc.fastcall) ?*anyopaque {
// stdcall(2): c=guidLow, d=guidHigh
const s = rdtsc();
if (AB_OTHER_HOOKS and ab_use_custom) {
const hash = (c ^ (d *% 0x9E3779B9)) & GUID_CACHE_MASK;
const entry = &guid_cache[hash];
if (entry.guid_lo == c and entry.guid_hi == d and entry.result != 0) {
const obj = entry.result;
if (hook.readMem(u32, obj + 0x30) == c and hook.readMem(u32, obj + 0x34) == d) {
guid_cache_hits +|= 1;
prof.findguid_cycles +|= rdtsc() - s;
prof.findguid_calls +|= 1;
return @ptrFromInt(obj);
}
}
guid_cache_misses +|= 1;
const ret = findguid_hook.callOriginal(.{ a, b, c, d });
entry.* = .{ .guid_lo = c, .guid_hi = d, .result = @intFromPtr(ret) };
prof.findguid_cycles +|= rdtsc() - s;
prof.findguid_calls +|= 1;
return ret;
}
const ret = findguid_hook.callOriginal(.{ a, b, c, d });
prof.findguid_cycles +|= rdtsc() - s;
prof.findguid_calls +|= 1;
@@ -1533,6 +1565,19 @@ fn dumpStats() void {
});
}
// GUID cache stats (custom mode only)
const guid_total = guid_cache_hits +| guid_cache_misses;
if (guid_total > 0) {
const ghit_pct = pct(guid_cache_hits, guid_total);
log.fmt(" guid_cache: {d}.{d}% hit ({d}hit/{d}miss)\n", .{
ghit_pct / 10, ghit_pct % 10,
guid_cache_hits,
guid_cache_misses,
});
guid_cache_hits = 0;
guid_cache_misses = 0;
}
// Dump particle VB stride info (once)
if (debug_vertex_count != 0) {
log.fmt(" partsetup_debug: verts={d} maxSprites={d} fmt={d} dataPtr=0x{x}\n", .{
@@ -1641,7 +1686,8 @@ pub fn installHooks() void {
// _ = colldet_hook.attach(0x6b88e0, &colldetDetour);
_ = activep_hook.attach(0x7b5a10, &activepDetour);
_ = cbiter_hook.attach(0x404130, &cbiterDetour);
_ = findguid_hook.attach(0x464890, &findguidDetour);
// findguid graduated to weirdperformance GUID cache
// _ = findguid_hook.attach(0x464890, &findguidDetour);
// _ = raytri2_hook.attach(0x632700, &raytri2Detour);
_ = drawbatch_hook.attach(0x70cb30, &drawbatchDetour);
_ = findlua_hook.attach(0x702000, &findluaDetour);