Burst Inspector → Assembly view. Inlined methods don't appear as call instructions; their body shows inline. Without inline: visible call instruction.

AggressiveInlining is a hint. Burst may still skip if inlining cost outweighs gain. Refactor to a more inlinable shape (smaller, fewer params).

Fix: Burst AggressiveInlining Attribute No Effect

Q: Why doesn't [MethodImpl(MethodImplOptions.AggressiveInlining)] inline in Burst?

Burst respects the hint but only for callable-from-Burst contexts. Method must be static or in a struct, signature blittable, and called from a [BurstCompile] job.

Quick answer: Method must be static / struct method, blittable signature, called from [BurstCompile] code. Verify in Burst Inspector Assembly view.

Hot helper called per particle. Profiler shows the call cost dominates. AggressiveInlining attribute set; expected inline didn’t happen.

The Fix

using System.Runtime.CompilerServices;

[BurstCompile]
public static class Hot {
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static float3 Step(float3 a, float dt) => a * dt;
}

[BurstCompile]
struct Job : IJob {
    public void Execute() {
        var r = Hot.Step(input, dt);   // inlined into job body
    }
}

Inspector confirms inline. Profiler ms drop. Not all hints are honored; small bodies inline reliably.

Verifying

Burst Inspector Assembly: no call instruction at the call site. Profiler: hot path tighter.

“Static. Blittable. Inlines.”

Related Issues

For Burst NoAlias, see NoAlias. For Burst AVX, see AVX.

Hint helps. Verify inspector.