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compiler-explorer/examples/spirv/default.spvasm
Spencer Fricke 02603a6371 Add SPIR-V language with SPIRV-Tools compilers (#6947)
for https://github.com/compiler-explorer/compiler-explorer/issues/2331

Hey, so I am currently trying to improve the SPIR-V ecosystem, in-charge
of the [SPIR-V Guide](https://github.com/KhronosGroup/SPIRV-Guide), and
part of the SPIR-V Working Group. We talked at our last Face-2-Face
gathering about getting more support for GPU tooling in something like
Compiler Explorer because you have all made this such an amazing tool!

I have enjoyed working in this codebase and happy to help keep improving
the SPIR-V as people find issues or want enhancements (I was already
about to spend time rebuilding Compiler Explorer, so happy to donate my
time to a single tool's effort)

(For those who haven't spent last few years staring at SPIR-V)

- SPIR-V is a an IR (very much like LLVM IR) but for GPUs
- SPIR-V can be used for Graphics and Compute
- Compute:
    - Can be tied to things like clang, llvm, mlir, OpenCL, etc
- One could take `spirv` as a language and compile it to something like
x86
      - (Future PRs for this realm of things)
- Graphics:
- Much harder to actually "compile" to any ISA because other graphics
pipeline information is missing that will effect the final ISA
- Microsoft has even now planned to move to [SPIR-V for DirectX
soon](https://devblogs.microsoft.com/directx/directx-adopting-spir-v/)
- Both:
- There are many tools that run on SPIR-V regardless (hence why they
share the same IR)
    - Being able to do tooling in compiler explorer would be AMAZING

This PR adds `SPIR-V` as a language and a new `SPIRV-Tools` compiler as
an initial compiler for it the language (since we already have the
SPIRV-Tools repo being pulled in on the infra side!)

I personally use `spirv-opt` and `spirv-val` the most and have been
testing this locally for a few days and feel it is ready to go. I plan
to slowly add more tools (ex. `spirv-fuzz`, `spirv-cross`,
`spirv-reflect`, etc)

Cheers!

(some screenshots of course)

![image](https://github.com/user-attachments/assets/419feab0-d030-4578-b32a-ef1cf95701da)

![image](https://github.com/user-attachments/assets/a00fa60f-7f05-4522-a9fc-1c43ecee1c42)
2024-10-28 21:24:50 -05:00

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; SPIR-V
; Version: 1.0
; Generator: Khronos Glslang Reference Front End; 7
; Bound: 19
; Schema: 0
OpCapability Shader
%1 = OpExtInstImport "GLSL.std.450"
OpMemoryModel Logical GLSL450
OpEntryPoint Fragment %main "main" %outFragColor %inColor
OpExecutionMode %main OriginUpperLeft
OpSource GLSL 450
OpName %main "main"
OpName %outFragColor "outFragColor"
OpName %inColor "inColor"
OpDecorate %outFragColor Location 0
OpDecorate %inColor Location 0
%void = OpTypeVoid
%3 = OpTypeFunction %void
%float = OpTypeFloat 32
%v4float = OpTypeVector %float 4
%_ptr_Output_v4float = OpTypePointer Output %v4float
%outFragColor = OpVariable %_ptr_Output_v4float Output
%v3float = OpTypeVector %float 3
%_ptr_Input_v3float = OpTypePointer Input %v3float
%inColor = OpVariable %_ptr_Input_v3float Input
%float_1 = OpConstant %float 1
%main = OpFunction %void None %3
%5 = OpLabel
%13 = OpLoad %v3float %inColor
%15 = OpCompositeExtract %float %13 0
%16 = OpCompositeExtract %float %13 1
%17 = OpCompositeExtract %float %13 2
%18 = OpCompositeConstruct %v4float %15 %16 %17 %float_1
OpStore %outFragColor %18
OpReturn
OpFunctionEnd