microsoft / microsoft/DirectXShaderCompiler

[SPIR-V] Array containing a Block or BufferBlock must not be decorated with ArrayStride

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bug spirv
Dominant language
C++
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Description

Description
Having an array of read-write structured buffers and passing one of them into a function produces the following error upon loading the shader module:
validation layer: vkCreateShaderModule(): pCreateInfo->pCode (spirv-val produced an error): Array containing a Block or BufferBlock must not be decorated with ArrayStride %_arr_type_ACSBuffer_counter_uint_7 = OpTypeArray %type_ACSBuffer_counter %uint_7 The Vulkan spec states: If pCode is a pointer to SPIR-V code, pCode must adhere to the validation rules described by the Validation Rules within a Module section of the SPIR-V Environment appendix (https://docs.vulkan.org/spec/latest/chapters/shaders.html#VUID-VkShaderModuleCreateInfo-pCode-08737)

Steps to Reproduce

[[vk::binding(0, 0)]]
RWStructuredBuffer<uint> bufs[7];
void Func(RWStructuredBuffer<uint> buf)
{
}

void main()
{
  Func(bufs[0]);
}

Might be related to this? https://github.com/microsoft/DirectXShaderCompiler/issues/7867

Environment

  • DXC version libdxcompiler.so: 1.8(dev;0-00000000); libdxil.so: 1.8
  • Host Operating System NixOS 2.28.3

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the minimal HLSL reproducer using the Func and main entry points, then inspect the generated SPIR-V around the array of RWStructuredBuffer values. Done means the shader module no longer produces the SPIR-V validation error that an array containing a Block or BufferBlock is decorated with ArrayStride.

Written by the indexing model from the issue text.

Assessment

Tech stack
cpp
Domain
compilers
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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