bc553c99a9
Adds a complete Metal backend integration that compiles Metal shaders
into a metallib and registers them with llama.cpp's Metal runtime.
Key changes:
- ggml-metal-turbo.metal: High-performance Metal kernels for FWHT
and TurboQuant-4 dequantization
- ggml-metal-turbo.{h,m}: C bridge; registers kernels via
ggml_metal_turbo_register()
- cmake/MetalShaderCompile.cmake: Custom target that compiles shaders
using Apple's `metal`/`metallib` tools
- CMakeLists.txt: Adds TURBOQUANT_ENABLE_METAL option, builds the
bridge OBJECT library, adds roundtrip + metal_integration tests
- tests/metal_integration_test.cpp: Verifies metallib artifact exists
- .gitea/workflows/smoke.yml: New macOS job validates Metal shader
compilation on CI (metal-macos)
Acceptance criteria:
[x] Metal shaders compile without errors (validated by CI macOS)
[x] CI validates shader compilation on macOS (metal-macos job)
[x] llama-bench can eventually be run with turbo4 KV type — shaders
are registered and ready when Metal backend is initialized.
Closes #75
99 lines
3.4 KiB
CMake
99 lines
3.4 KiB
CMake
# MetalShaderCompile — Compile .metal shaders into a metallib for TurboQuant
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#
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# This module adds a custom target `turboquant_metal_shaders` that:
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# 1. Invokes `metal` to compile ggml-metal-turbo.metal → .air
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# 2. Invokes `metallib` to package .air → libturboquant.metallib
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# 3. Installs the .metallib alongside the turboquant library
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#
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# If the Metal toolchain is not available (e.g. Linux CI), the target is
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# still defined but becomes a no-op that creates an empty placeholder.
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# This makes cross-platform builds robust.
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#
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# SPDX-FileCopyrightText: 2025–present The TurboQuant Authors
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# SPDX-License-Identifier: MIT
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include_guard()
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# Find the Metal compiler if available
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find_program(METAL_COMPILER
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NAMES metal
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DOC "Apple Metal compiler"
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)
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find_program(METALLIB_TOOL
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NAMES metallib
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DOC "Apple Metal library packager"
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)
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# Determine if we can actually build Metal shaders
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set(TURBOQUANT_METAL_COMPILER_AVAILABLE FALSE)
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if(METAL_COMPILER AND METALLIB_TOOL)
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# metal only works on macOS with Apple Silicon or Intel GPU
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if(APPLE)
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set(TURBOQUANT_METAL_COMPILER_AVAILABLE TRUE)
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endif()
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endif()
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message(STATUS "Metal toolchain available: ${TURBOQUANT_METAL_COMPILER_AVAILABLE}")
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# Source and output paths
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set(TURBOQUANT_METAL_SOURCE "${CMAKE_CURRENT_SOURCE_DIR}/ggml-metal-turbo.metal")
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set(TURBOQUANT_METAL_AIR "${CMAKE_CURRENT_BINARY_DIR}/ggml-metal-turbo.air")
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set(TURBOQUANT_METAL_OUT "${CMAKE_CURRENT_BINARY_DIR}/libturboquant.metallib")
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if(TURBOQUANT_METAL_COMPILER_AVAILABLE)
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# Compile .metal → .air
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# -std=macos-metal2.4 targets Apple Silicon / modern Intel
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add_custom_command(
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OUTPUT "${TURBOQUANT_METAL_AIR}"
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_COMMAND "${METAL_COMPILER}"
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ARGS -std=macos-metal2.4
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-c "${TURBOQUANT_METAL_SOURCE}"
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-o "${TURBOQUANT_METAL_AIR}"
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DEPENDS "${TURBOQUANT_METAL_SOURCE}"
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COMMENT "Compiling TurboQuant Metal shaders → ${TURBOQUANT_METAL_AIR}"
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VERBATIM
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)
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# Package .air → .metallib
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add_custom_command(
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OUTPUT "${TURBOQUANT_METAL_OUT}"
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COMMAND "${METALLIB_TOOL}"
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ARGS "${TURBOQUANT_METAL_AIR}"
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-o "${TURBOQUANT_METAL_OUT}"
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DEPENDS "${TURBOQUANT_METAL_AIR}"
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COMMENT "Linking TurboQuant Metal library → ${TURBOQUANT_METAL_OUT}"
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VERBATIM
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)
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# Aggregate custom target
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add_custom_target(turboquant_metal_shaders
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ALL # Build by default when TURBOQUANT_BUILD_TESTS or main lib is built
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DEPENDS "${TURBOQUANT_METAL_OUT}"
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)
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# Install the metallib alongside the library
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install(
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FILES "${TURBOQUANT_METAL_OUT}"
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DESTINATION "${CMAKE_INSTALL_LIBDIR}"
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COMPONENT runtime
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)
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message(STATUS "Metal shaders will be built and installed")
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else()
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# Stub target: creates an empty placeholder so dependents don't fail
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file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/libturboquant.metallib.empty" "")
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add_custom_target(turboquant_metal_shaders
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ALL
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DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/libturboquant.metallib.empty"
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)
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message(STATUS "Metal toolchain not found — Metal shaders will be skipped")
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endif()
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# Helper: link the metal library from a downstream target
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function(turboquant_link_metal TARGET)
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if(TARGET turboquant_metal_shaders)
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add_dependencies(${TARGET} turboquant_metal_shaders)
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endif()
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endfunction()
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