Burst & Span constructor: Invalid bitcast

Unity Engine
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1

I have an array declared like this:
readonly static int[] triTable = new int[16 * 12]{ ... }

And a view on this array declared like this:
Span<int> triangulationInfo = new Span<int>(triTable, cellConfig * 12, 12);

Which generates the obscure error:

Burst internal compiler error: Burst.Compiler.IL.CompilerException: Error while verifying module: Invalid bitcast
  %164 = bitcast <{ ptr, i32 }> %159 to ptr, !dbg !274

  at Burst.Compiler.IL.NativeCompiler.Compile (Burst.Compiler.IL.CompilerStatistics stats) [0x004ca] in <74b8d24c73d245b5952c698ae125060a>:0 
  at Burst.Compiler.IL.Server.LibraryCompiler.HashAndCompileMethodGroup (Burst.Compiler.IL.Server.CompilationJob request, System.Int32 methodGroupIndex, Burst.Compiler.IL.Server.SharedLibraryCompilationState sharedState, Burst.Compiler.IL.Aot.AotCompilerOptions defaultOptions, Burst.Compiler.IL.NativeCompiler& nativeCompiler, Burst.Compiler.IL.Aot.AotModuleGroup& aotModuleGroup) [0x00570] in <74b8d24c73d245b5952c698ae125060a>:0

A workaround is to assign the array to the span and then slice it:

Span<int> triangulationInfo = triTable;
triangulationInfo.Slice(cellConfig * 12, 12);

Burst 1.8.16, Unity 2022.3.40f1

(the reason I’m using Span is simply because I can use the ref T operator[])

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2

Hi, Selmar. Could you please try updating your Burst package to the newest 1.8.19 version and checking if the issue persists?

3

Hi Jonas, I can confirm the issue persists with Burst 1.8.19

4

Hey, I’m working on a fix for this. Thanks for reporting

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