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ChangeLog-5x.md

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5.x series change log

This page summarizes the major functional and performance changes in each release of the 5.x series.

All performance data on this page is measured on an Intel Core i5-9600K clocked at 4.2 GHz, running astcenc using AVX2 and 6 threads.

5.1.0

Status: November 2024

The 5.1.0 release is an optimization release, giving moderate performance improvements on all platforms. There are no image quality differences.

  • General:
    • Feature: Added a new CMake build option to control use of native gathers, as they can be slower than scalar loads on some common x86 microarchitectures. Build with -DASTCENC_X86_GATHERS=OFF to disable use of native gathers in AVX2 builds.
    • Optimization: Added new gather() abstraction for gathers using byte indices, allowing implementations without gather hardware to skip the byte-to-int index conversion.
    • Optimization: Optimized compute_lowest_and_highest_weight() to pre-compute min/max outside of the main loop.
    • Optimization: Added improved intrinsics sequence for SSE and AVX2 integer hmin() and hmax().
    • Optimization: Added improved intrinsics sequence for vint4(uint8_t*) on systems implementing Arm SVE.

5.0.0

Status: November 2024

The 5.0.0 release is the first stable release in the 5.x series. The main new feature is support for the Arm Scalable Vector Extensions (SVE) SIMD instruction set.

  • General:
    • Bug fix: Fixed incorrect return type in "None" vector library reference implementation.
    • Bug fix: Fixed sincos table index under/overflow.
    • Feature: Changed ASTCENC_ISA_NATIVE builds to use -march=native and -mcpu=native.
    • Feature: Added backend for Arm SVE fixed-width 256-bit builds. These can only run on hardware implementing 256-bit SVE.
    • Feature: Added backend for Arm SVE 128-bit builds. These are portable builds and can run on hardware implementing any SVE vector length, but the explicit SVE use is augmented NEON and will only use the bottom 128-bits of each SVE vector.
    • Feature: Optimized NEON mask any() and all() functions.
    • Feature: Migrated build and test to GitHub Actions pipelines.

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