Add Metal backend for Apple Silicon GPU acceleration#6
Add Metal backend for Apple Silicon GPU acceleration#6robtaylor wants to merge 1 commit intofacebookresearch:mainfrom
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Implements Apple Metal support as an additional backend alongside CPU and CUDA: - MetalDefs.h/mm: Buffer registry, context management, and MetalMirror helper - MetalKernels.metal: Compute shaders for factorization and solve operations - MatOpsMetal.mm: NumericCtx and SolveCtx implementations using Metal + Eigen - MetalFactorTest.cpp, MetalSolveTest.cpp: Test suites for factor and solve ops Key implementation details: - Float-only (Apple Silicon lacks double precision support) - Uses Eigen for dense operations (potrf, trsm, saveSyrkGemm) - Metal compute kernels for sparse operations (factor_lumps, sparse_elim, assemble) - MTLResourceStorageModeShared for CPU/GPU data sharing - Row-major storage for Eigen compatibility All 8 Metal tests pass (factor, solve with sparse elimination + dense factorization). All 89 CPU tests continue to pass. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
Implements Apple Metal support as a GPU backend for macOS/iOS with Apple Silicon:
Key Features
BackendAutofor automatic backend detection (CUDA > Metal > OpenCL > CPU)detectBestBackend()helper functionTests
Test Plan
-DBASPACHO_USE_METAL=1on macOS🤖 Generated with Claude Code