Add packed matrix layout support for SPV_INTEL_joint_matrix

[Copilot]

Implements the packed matrix layout support for the SPV_INTEL_joint_matrix extension as specified in the SPV_INTEL_joint_matrix specification.

Changes Made

• Added CapabilityPackedCooperativeMatrixINTEL constant definition in spirv_internal.hpp
• Added name mapping for the capability in SPIRVNameMapEnum.h
• Added capability dependency in SPIRVEnum.h (depends on JointMatrixINTEL)
• Modified SPIRVTypeJointMatrixINTEL::getRequiredCapability() in SPIRVType.cpp to return the PackedCooperativeMatrixINTEL capability when the matrix layout is PackedA (2) or PackedB (3)
• Created test file joint_matrix_packed.ll covering both forward translation (LLVM IR → SPIR-V) and reverse translation (SPIR-V → LLVM IR)

Testing

The test verifies that the PackedCooperativeMatrixINTEL capability is correctly emitted in SPIR-V when using packed matrix layouts, and that the types are correctly preserved during reverse translation.

Original prompt

Add missing implementation for the spec https://github.com/MrSidims/llvm/blob/update-matrix-spec-2/sycl/doc/design/spirv-extensions/SPV_INTEL_joint_matrix.asciidoc

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[vmaksimo]

@copilot I updated the branch so now it is buildable and passing all lit tests. We need to actually implement packed matrix layout and cover it with the test

[Copilot]

@copilot I updated the branch so now it is buildable and passing all lit tests. We need to actually implement packed matrix layout and cover it with the test

Implemented the packed matrix layout support in commit 61a833e. The changes:

• Added CapabilityPackedCooperativeMatrixINTEL constant and name mapping
• Modified SPIRVTypeJointMatrixINTEL::getRequiredCapability() to return the capability when layout is PackedA (2) or PackedB (3)
• Added test file joint_matrix_packed.ll covering both forward and reverse translation