Missing disassembly on .NET 9

[MihaZupan]

Running the following benchmark

using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Jobs;
using BenchmarkDotNet.Running;
using System.Buffers;

BenchmarkRunner.Run<Test>(args: args);

[DisassemblyDiagnoser(10)]
[ShortRunJob(RuntimeMoniker.Net80)]
[ShortRunJob(RuntimeMoniker.Net90)]
public class Test
{
    private static readonly SearchValues<char> s_values = SearchValues.Create("aeiouAEIOU");
    private static readonly string s_text = new('\n', 1000);

    [Benchmark]
    public void ContainsAny() => s_text.AsSpan().ContainsAny(s_values);
}

will print something like

| Method      | Job               | Runtime  | Mean     | Error    | StdDev   | Code Size |
|------------ |------------------ |--------- |---------:|---------:|---------:|----------:|
| ContainsAny | ShortRun-.NET 8.0 | .NET 8.0 | 12.89 ns | 4.731 ns | 0.259 ns |     566 B |
| ContainsAny | ShortRun-.NET 9.0 | .NET 9.0 | 11.86 ns | 0.263 ns | 0.014 ns |      55 B |

(.NET 8.0.8 and 9.0 RC 1)

where the disassembly for .NET 9 is just the top-most benchmarked method, calling into something, but the callee isn't included.

; Test.ContainsAny()
       sub       rsp,28
       mov       r8,237BFC003E8
       mov       rcx,[r8]
       add       rcx,0C
       mov       r8,237BFC003E0
       mov       r8,[r8]
       add       r8,8
       mov       edx,3E8
       call      qword ptr [7FFC211FE700]
       nop
       add       rsp,28
       ret
; Total bytes of code 55

I'm sure this used to work earlier in .NET 9, so it's possible a change in .NET broke this.

[timcassell]

Fixed by #2488

[MihaZupan]

Thank you. I'm using a local build of that change now, looks like it's working as expected.