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dynamic_dispatch

One interface, n implementations, called through an existential whose concrete type is chosen at runtime (defeats static specialization, forcing witness-table dynamic dispatch). Stresses dispatch lowering / specializeModule. Scaling null: n scales implementations and switch cases; generated code is O(n), so ideal cost is O(n).

bucket: dynamic_dispatch  ·  compile mode: target  ·  flags: -target spirv -emit-spirv-directly  ·  default N: 200

Phase composition across releases

Full sub-counter decomposition of compileInner — named leaf timers plus (self) residuals (a parent's time not covered by a named child, e.g. the autodiff transform in linkAndOptimizeIR (self)). Topmost band traces compileInner; hover a band for its phase.

Across releases

dynamic_dispatch — Across releases (median ms) dynamic_dispatch 0.60× 0.0 270 540 25.12 25.13 25.14 25.15 25.16 25.17 25.18 25.19 25.20 25.21 25.22 25.23 25.24 26.1 26.2 26.3 26.4 26.5 26.7 26.8 26.9 26.10 26.11 26.12 26.13 26.13.1 26.14 26.14.1 26.16 26.16.1 dynamic_dispatch — parseTranslationUnit dynamic_dispatch — SemanticChecking dynamic_dispatch — generateIR dynamic_dispatch — frontEndExecute (self) dynamic_dispatch — specializeModule dynamic_dispatch — simplifyIR dynamic_dispatch — linkIR dynamic_dispatch — unrollLoopsInModule dynamic_dispatch — legalizeResourceTypes dynamic_dispatch — legalizeExistentialTypeLayout dynamic_dispatch — performMandatoryEarlyInlining dynamic_dispatch — performForceInlining dynamic_dispatch — linkAndOptimizeIR (self) dynamic_dispatch — generateOutput (self) dynamic_dispatch — compileInner (self) phase buckets parseTranslationUnit SemanticChecking generateIR frontEndExecute (self) specializeModule simplifyIR linkIR unrollLoopsInModule legalizeResourceTypes legalizeExistentialTypeLayout performMandatoryEarlyInlining performForceInlining linkAndOptimizeIR (self) emitEntryPointsSourceFromIR generateOutput (self) compileInner (self)

Daily tip-of-tree (last 30 days)

dynamic_dispatch — Daily tip-of-tree (last 30 days) (median ms) dynamic_dispatch 0.96× 0.0 66 132 07-30 07-31 08-01 08-02 08-03 08-04 08-05 08-06 08-07 08-08 08-09 08-10 08-11 08-12 08-13 08-14 08-15 08-15 08-18 08-19 08-20 08-21 08-22 08-23 08-24 08-25 08-26 08-27 08-28 08-29 dynamic_dispatch — parseTranslationUnit dynamic_dispatch — SemanticChecking dynamic_dispatch — generateIR dynamic_dispatch — frontEndExecute (self) dynamic_dispatch — specializeModule dynamic_dispatch — simplifyIR dynamic_dispatch — linkIR dynamic_dispatch — unrollLoopsInModule dynamic_dispatch — legalizeResourceTypes dynamic_dispatch — legalizeExistentialTypeLayout dynamic_dispatch — performMandatoryEarlyInlining dynamic_dispatch — performForceInlining dynamic_dispatch — linkAndOptimizeIR (self) dynamic_dispatch — generateOutput (self) dynamic_dispatch — compileInner (self) phase buckets parseTranslationUnit SemanticChecking generateIR frontEndExecute (self) specializeModule simplifyIR linkIR unrollLoopsInModule legalizeResourceTypes legalizeExistentialTypeLayout performMandatoryEarlyInlining performForceInlining linkAndOptimizeIR (self) emitEntryPointsSourceFromIR generateOutput (self) compileInner (self)

Daily window progress

Overall compileInner: 120.8 → 116.6 ms  -3.5%  (2026-07-30 7c58a326b → 2026-08-29 28c755b09)

Contributors — the mutually-exclusive phase buckets (named leaves + (self) residuals) that tile compileInner; the pp column sums to the overall %. Buckets moving the total by ≥0.2% are listed, the rest fold into the remainder row. Below them, every other reported counter (nested/overlapping, e.g. serialized-module reads — own change only):

counterΔown %of total
generateOutput (self)-1.3 ms-5.2%-1.0pp
linkAndOptimizeIR (self)-1.0 ms-6.6%-0.8pp
legalizeExistentialTypeLayout-0.7 ms-24.4%-0.5pp
legalizeResourceTypes-0.6 ms-31.0%-0.5pp
compileInner (self)-0.3 ms-100.0%-0.2pp
(remaining 10 buckets)-0.4 ms-0.3pp
loadBuiltinModule-2.7 ms-2.5%
readSerializedModuleIR-2.6 ms-4.8%

Largest day steps (≥5% of the previous day, both directions; bisect with git log <c0>..<c1> -- source/):

boundary% vs prev daycommitstop buckets (own %)
none

Reproduce

Run from the slang repo root. This regenerates the sources below and re-runs this workload's measurement; --gen-dir keeps the generated files (they go to a tempdir and are deleted otherwise).

python3 tools/compile-perf/bench.py --slangc /path/to/slangc --only dynamic_dispatch --label repro --gen-dir repro-dynamic_dispatch

Compiled Slang source

the complete compiled source (N = 200), shown in full

dynamic_dispatch.slang (429 lines)

// AUTO-GENERATED by perf-suite/workloads.py - do not edit by hand.
RWStructuredBuffer<float> outBuf;

[anyValueSize(16)]
interface IShape { float eval(float x); }

struct Shape0 : IShape { float eval(float x) { return x * 1.0 + 0.0 + sin(x * 1.0); } }
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struct Shape179 : IShape { float eval(float x) { return x * 180.0 + 179.0 + sin(x * 180.0); } }
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struct Shape181 : IShape { float eval(float x) { return x * 182.0 + 181.0 + sin(x * 182.0); } }
struct Shape182 : IShape { float eval(float x) { return x * 183.0 + 182.0 + sin(x * 183.0); } }
struct Shape183 : IShape { float eval(float x) { return x * 184.0 + 183.0 + sin(x * 184.0); } }
struct Shape184 : IShape { float eval(float x) { return x * 185.0 + 184.0 + sin(x * 185.0); } }
struct Shape185 : IShape { float eval(float x) { return x * 186.0 + 185.0 + sin(x * 186.0); } }
struct Shape186 : IShape { float eval(float x) { return x * 187.0 + 186.0 + sin(x * 187.0); } }
struct Shape187 : IShape { float eval(float x) { return x * 188.0 + 187.0 + sin(x * 188.0); } }
struct Shape188 : IShape { float eval(float x) { return x * 189.0 + 188.0 + sin(x * 189.0); } }
struct Shape189 : IShape { float eval(float x) { return x * 190.0 + 189.0 + sin(x * 190.0); } }
struct Shape190 : IShape { float eval(float x) { return x * 191.0 + 190.0 + sin(x * 191.0); } }
struct Shape191 : IShape { float eval(float x) { return x * 192.0 + 191.0 + sin(x * 192.0); } }
struct Shape192 : IShape { float eval(float x) { return x * 193.0 + 192.0 + sin(x * 193.0); } }
struct Shape193 : IShape { float eval(float x) { return x * 194.0 + 193.0 + sin(x * 194.0); } }
struct Shape194 : IShape { float eval(float x) { return x * 195.0 + 194.0 + sin(x * 195.0); } }
struct Shape195 : IShape { float eval(float x) { return x * 196.0 + 195.0 + sin(x * 196.0); } }
struct Shape196 : IShape { float eval(float x) { return x * 197.0 + 196.0 + sin(x * 197.0); } }
struct Shape197 : IShape { float eval(float x) { return x * 198.0 + 197.0 + sin(x * 198.0); } }
struct Shape198 : IShape { float eval(float x) { return x * 199.0 + 198.0 + sin(x * 199.0); } }
struct Shape199 : IShape { float eval(float x) { return x * 200.0 + 199.0 + sin(x * 200.0); } }

float dispatch(int id, float x)
{
    IShape s;
    switch (id)
    {
    case 0: s = Shape0(); break;
    case 1: s = Shape1(); break;
    case 2: s = Shape2(); break;
    case 3: s = Shape3(); break;
    case 4: s = Shape4(); break;
    case 5: s = Shape5(); break;
    case 6: s = Shape6(); break;
    case 7: s = Shape7(); break;
    case 8: s = Shape8(); break;
    case 9: s = Shape9(); break;
    case 10: s = Shape10(); break;
    case 11: s = Shape11(); break;
    case 12: s = Shape12(); break;
    case 13: s = Shape13(); break;
    case 14: s = Shape14(); break;
    case 15: s = Shape15(); break;
    case 16: s = Shape16(); break;
    case 17: s = Shape17(); break;
    case 18: s = Shape18(); break;
    case 19: s = Shape19(); break;
    case 20: s = Shape20(); break;
    case 21: s = Shape21(); break;
    case 22: s = Shape22(); break;
    case 23: s = Shape23(); break;
    case 24: s = Shape24(); break;
    case 25: s = Shape25(); break;
    case 26: s = Shape26(); break;
    case 27: s = Shape27(); break;
    case 28: s = Shape28(); break;
    case 29: s = Shape29(); break;
    case 30: s = Shape30(); break;
    case 31: s = Shape31(); break;
    case 32: s = Shape32(); break;
    case 33: s = Shape33(); break;
    case 34: s = Shape34(); break;
    case 35: s = Shape35(); break;
    case 36: s = Shape36(); break;
    case 37: s = Shape37(); break;
    case 38: s = Shape38(); break;
    case 39: s = Shape39(); break;
    case 40: s = Shape40(); break;
    case 41: s = Shape41(); break;
    case 42: s = Shape42(); break;
    case 43: s = Shape43(); break;
    case 44: s = Shape44(); break;
    case 45: s = Shape45(); break;
    case 46: s = Shape46(); break;
    case 47: s = Shape47(); break;
    case 48: s = Shape48(); break;
    case 49: s = Shape49(); break;
    case 50: s = Shape50(); break;
    case 51: s = Shape51(); break;
    case 52: s = Shape52(); break;
    case 53: s = Shape53(); break;
    case 54: s = Shape54(); break;
    case 55: s = Shape55(); break;
    case 56: s = Shape56(); break;
    case 57: s = Shape57(); break;
    case 58: s = Shape58(); break;
    case 59: s = Shape59(); break;
    case 60: s = Shape60(); break;
    case 61: s = Shape61(); break;
    case 62: s = Shape62(); break;
    case 63: s = Shape63(); break;
    case 64: s = Shape64(); break;
    case 65: s = Shape65(); break;
    case 66: s = Shape66(); break;
    case 67: s = Shape67(); break;
    case 68: s = Shape68(); break;
    case 69: s = Shape69(); break;
    case 70: s = Shape70(); break;
    case 71: s = Shape71(); break;
    case 72: s = Shape72(); break;
    case 73: s = Shape73(); break;
    case 74: s = Shape74(); break;
    case 75: s = Shape75(); break;
    case 76: s = Shape76(); break;
    case 77: s = Shape77(); break;
    case 78: s = Shape78(); break;
    case 79: s = Shape79(); break;
    case 80: s = Shape80(); break;
    case 81: s = Shape81(); break;
    case 82: s = Shape82(); break;
    case 83: s = Shape83(); break;
    case 84: s = Shape84(); break;
    case 85: s = Shape85(); break;
    case 86: s = Shape86(); break;
    case 87: s = Shape87(); break;
    case 88: s = Shape88(); break;
    case 89: s = Shape89(); break;
    case 90: s = Shape90(); break;
    case 91: s = Shape91(); break;
    case 92: s = Shape92(); break;
    case 93: s = Shape93(); break;
    case 94: s = Shape94(); break;
    case 95: s = Shape95(); break;
    case 96: s = Shape96(); break;
    case 97: s = Shape97(); break;
    case 98: s = Shape98(); break;
    case 99: s = Shape99(); break;
    case 100: s = Shape100(); break;
    case 101: s = Shape101(); break;
    case 102: s = Shape102(); break;
    case 103: s = Shape103(); break;
    case 104: s = Shape104(); break;
    case 105: s = Shape105(); break;
    case 106: s = Shape106(); break;
    case 107: s = Shape107(); break;
    case 108: s = Shape108(); break;
    case 109: s = Shape109(); break;
    case 110: s = Shape110(); break;
    case 111: s = Shape111(); break;
    case 112: s = Shape112(); break;
    case 113: s = Shape113(); break;
    case 114: s = Shape114(); break;
    case 115: s = Shape115(); break;
    case 116: s = Shape116(); break;
    case 117: s = Shape117(); break;
    case 118: s = Shape118(); break;
    case 119: s = Shape119(); break;
    case 120: s = Shape120(); break;
    case 121: s = Shape121(); break;
    case 122: s = Shape122(); break;
    case 123: s = Shape123(); break;
    case 124: s = Shape124(); break;
    case 125: s = Shape125(); break;
    case 126: s = Shape126(); break;
    case 127: s = Shape127(); break;
    case 128: s = Shape128(); break;
    case 129: s = Shape129(); break;
    case 130: s = Shape130(); break;
    case 131: s = Shape131(); break;
    case 132: s = Shape132(); break;
    case 133: s = Shape133(); break;
    case 134: s = Shape134(); break;
    case 135: s = Shape135(); break;
    case 136: s = Shape136(); break;
    case 137: s = Shape137(); break;
    case 138: s = Shape138(); break;
    case 139: s = Shape139(); break;
    case 140: s = Shape140(); break;
    case 141: s = Shape141(); break;
    case 142: s = Shape142(); break;
    case 143: s = Shape143(); break;
    case 144: s = Shape144(); break;
    case 145: s = Shape145(); break;
    case 146: s = Shape146(); break;
    case 147: s = Shape147(); break;
    case 148: s = Shape148(); break;
    case 149: s = Shape149(); break;
    case 150: s = Shape150(); break;
    case 151: s = Shape151(); break;
    case 152: s = Shape152(); break;
    case 153: s = Shape153(); break;
    case 154: s = Shape154(); break;
    case 155: s = Shape155(); break;
    case 156: s = Shape156(); break;
    case 157: s = Shape157(); break;
    case 158: s = Shape158(); break;
    case 159: s = Shape159(); break;
    case 160: s = Shape160(); break;
    case 161: s = Shape161(); break;
    case 162: s = Shape162(); break;
    case 163: s = Shape163(); break;
    case 164: s = Shape164(); break;
    case 165: s = Shape165(); break;
    case 166: s = Shape166(); break;
    case 167: s = Shape167(); break;
    case 168: s = Shape168(); break;
    case 169: s = Shape169(); break;
    case 170: s = Shape170(); break;
    case 171: s = Shape171(); break;
    case 172: s = Shape172(); break;
    case 173: s = Shape173(); break;
    case 174: s = Shape174(); break;
    case 175: s = Shape175(); break;
    case 176: s = Shape176(); break;
    case 177: s = Shape177(); break;
    case 178: s = Shape178(); break;
    case 179: s = Shape179(); break;
    case 180: s = Shape180(); break;
    case 181: s = Shape181(); break;
    case 182: s = Shape182(); break;
    case 183: s = Shape183(); break;
    case 184: s = Shape184(); break;
    case 185: s = Shape185(); break;
    case 186: s = Shape186(); break;
    case 187: s = Shape187(); break;
    case 188: s = Shape188(); break;
    case 189: s = Shape189(); break;
    case 190: s = Shape190(); break;
    case 191: s = Shape191(); break;
    case 192: s = Shape192(); break;
    case 193: s = Shape193(); break;
    case 194: s = Shape194(); break;
    case 195: s = Shape195(); break;
    case 196: s = Shape196(); break;
    case 197: s = Shape197(); break;
    case 198: s = Shape198(); break;
    case 199: s = Shape199(); break;
    default: s = Shape0(); break;
    }
    return s.eval(x);
}

float run(IShape s, float x) { return s.eval(x); }

[shader("compute")]
[numthreads(1,1,1)]
void computeMain(uint3 tid : SV_DispatchThreadID)
{
    float acc = 0.0;
    int base = int(tid.x);
    for (int i = 0; i < 200; ++i)
        acc += dispatch((base + i) % 200, outBuf[0] + float(i));
    outBuf[0] = acc;
}