llvm dev - Apr 2018 - SPIR-V & LLVM JIT Compiler

Hello,

I'm trying to build an application and would like to load SPIR-V binary
files, and JIT Compile it via LLVM to run shaders on CPU.

I would like to use a library (or possibly build my own) that parses SPIR-V
and JIT compiles via LLVM API. Then the library can provide C++ interface
to compiled data in memory, and I can access resources or call shader
methods via the interface.

The reason I'm looking for a C++ library is that I want the LLVM part
isolated from my applications.

*Steps In My Mind*
- Load/Parse SPIR-V binary files.
- Generate LLVM IR with LLVM API to JIT Compile shaders in memory via the
library.
- Use a C++ interface to access resources in memory and bind shader methods
to call from an application.

Is there a C++ library or code example that I can use for this? Or could
you please guide me by providing steps to achieve this in the shortest path?

Best,

Aaron
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In terms of something preexisting, Google’s clspv is the only library I know of
that can produce Vulkan SPIR-V, but I believe it is limited to compute shaders.
There are a few others that deal with OpenCL SPIR-V.

Assuming one of the above suits your need, in order to get JITable modules from
LLMV modules you will at the very least need to:
- alter the target triple of the module to match your CPU/OS/Env
- translate the address spaces
- translate/implement the intrinsics/special functions (see libclc for an
example for OpenCL)

I plan to get a more cohesive integration of SPIR-V and LLVM at IWOCL in May.

Nic

On 7 Apr 2018, at 6:42 am, Aaron T via llvm-dev <llvm-dev at
lists.llvm.org<mailto:llvm-dev at lists.llvm.org>> wrote:

Hello,

I'm trying to build an application and would like to load SPIR-V binary
files, and JIT Compile it via LLVM to run shaders on CPU.

I would like to use a library (or possibly build my own) that parses SPIR-V and
JIT compiles via LLVM API. Then the library can provide C++ interface to
compiled data in memory, and I can access resources or call shader methods via
the interface.

The reason I'm looking for a C++ library is that I want the LLVM part
isolated from my applications.

Steps In My Mind
- Load/Parse SPIR-V binary files.
- Generate LLVM IR with LLVM API to JIT Compile shaders in memory via the
library.
- Use a C++ interface to access resources in memory and bind shader methods to
call from an application.

Is there a C++ library or code example that I can use for this? Or could you
please guide me by providing steps to achieve this in the shortest path?

Best,

Aaron

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