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Silex v0.47.0

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@github-actions github-actions released this 24 Sep 11:19
· 11 commits to main since this release
v0.47.0
65cce7f

Why upgrade?

This release restores the native backend as the default on every host,
including macOS ARM64. It reduces allocation and copying costs in native
programs and fixes lifetime and code-generation errors in both backends.

Changes

  • run, test, and compile without --backend now select native.
    LLVM remains explicitly available on macOS ARM64 through --backend llvm.
  • On macOS ARM64, small native allocations use the system heap
    (calloc/free) instead of a memory mapping per allocation. A
    fixed-work CCD diagnostic
    in Release, with 16 bodies, four moving walls, and 24 steps, measures
    16.48–17.06 ms/step before and 1.70–2.51 ms/step after this change,
    with identical physics code and final states. These two measurement pairs
    isolate allocator cost: they are neither a guaranteed general speedup nor
    a complete comparison between published versions.
  • The ARM64 native backend narrows nested aggregate copies, admits more scalar
    regions, and optimizes checked-view kernels. It correctly preserves SIMD
    registers and floating-point components across calls.
  • LLVM fixes recursive class-graph copies, tagged-enum equality, inherited
    calls, resources, collections, and callbacks. Both backends strengthen cycle
    collection and preservation of descendants that are still live.
  • The compiler releases unneeded analysis data earlier and bounds temporary
    memory used by some analyses and evaluations.

Impact and migration

On macOS ARM64, add --backend llvm to retain the default backend used in
0.45–0.46. Other hosts keep their existing default. Recompile your programs to
benefit from the fixes; no syntax migration is required. The figures above
apply only to the stated native macOS ARM64 diagnostic, not other
architectures or application FPS.

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