Mesa / Dozen — VK_EXT_memory_budget (Merged Feb 2026)

  • What: Implemented VK_EXT_memory_budget support to Mesa Dozen driver.
  • Impact: Enables Vulkan apps to query memory budgets via the Vulkan extension API.
  • Skills: Vulkan, Mesa driver stack, upstream reviews, debugging/validation
  • Merge Request

ISPC — Faster packed_load_store2 on AVX2 i32x8 (Merged Mar 2025)

  • What: Improved performance of packed_load_store2 for the AVX2 i32x8 target by removing util.m4 macro usage in target-avx2-common-i32x8.ll and replacing it with faster custom implementations (initially for __packed_store_active2i32 / __packed_store_active2i64).
  • Impact: Speeds up common “packed store active lanes” patterns used by ISPC’s vectorized codegen/runtime paths on AVX2, backed by benchmark comparisons in the PR discussion.
  • How: Implementations were based on an algorithm referenced from a StackOverflow discussion, then iterated through review feedback and portability fixes.
  • Fixes/compat: Resolved x86 test failures by switching from 64-bit PDEP (not encodable on x86) to a 32-bit PDEP approach so it works on both x86 and x86-64.
  • Skills: SIMD, AVX2, LLVM IR, compiler builtins, performance optimization, x86
  • PR #3275 Merged to ispc:main