Issues

• LLVM trunk nightly build failure

  llvm-trunk
  ispc/ispc#3912 · Filter by author github-actions opened on Oct 1, 2026

• Handle AVX10.2 dispatch when APX is not usable

  Codegen
  Bug

  ispc/ispc#3905 · Filter by author azwolski opened on Sep 23, 2026
  

• Feature request: Support loading SPV from memory buffer

  GPURuntime / Tasks
  Enhancement

  ispc/ispc#3900 · Filter by author ElaraFX opened on Sep 18, 2026
  1

• Crash passing reference to template arg

  CrashFrontend / ParserTemplates
  Bug

  ispc/ispc#3893 · Filter by author larsbohn opened on Sep 14, 2026
  1

  

• ISPC 1.31 AVX-512 miscompile: masked load sunk below masked store

  CodegenLLVM bug
  Bug

  ispc/ispc#3891 · Filter by author johguenther opened on Aug 10, 2026
  1

  

• Add AMD Zen6 CPU definition

  Enhancement

  ispc/ispc#3889 · Filter by author nurmukhametov opened on Aug 3, 2026
  

• Feature: Disable hardcoded 32-bit ARM builtins & remove linux asm/types.h kernel header dependency

  Building Compiler
  Enhancement

  ispc/ispc#3887 · Filter by author 1234562026 opened on Jul 20, 2026
  5

  

• Surface run_tests.py diagnostics in alloy.py build logs when tests fail

  CI / GitHub Actions
  Task

  ispc/ispc#3868 · Filter by author aneshlya opened on Jun 23, 2026

• Build silently continues when builtins-c-cpu.cpp fails to compile for certain targets

  Building Compiler
  Bug

  ispc/ispc#3845 · Filter by author aneshlya opened on May 21, 2026
  3

• Handle 0...MACRO foreach range normalization in included files

  Frontend / Parser
  Bug

  ispc/ispc#3839 · Filter by author azwolski opened on May 21, 2026

• Wrong type in __count_leading_zeros_varying_i64 in generic.ispc

  QuestionStandard Library
  ispc/ispc#3833 · Filter by author zephyr111 opened on May 15, 2026
  9

• Vulkan interop for xpu examples and Intel GPUs?

  GPUQuestionRuntime / Tasks
  Enhancement

  ispc/ispc#3820 · Filter by author procedural opened on May 3, 2026
  7

• Improve the precision of the sin function

  Standard Library
  Bug

  ispc/ispc#3817 · Filter by author zephyr111 opened on May 1, 2026
  

• Allow distinguishing fast-math vs default-math library in functional tests

  CI / GitHub ActionsStandard Library
  Task

  ispc/ispc#3815 · Filter by author aneshlya opened on Apr 28, 2026

• Redefining stdlib functions

  Frontend / ParserQuality of LifeStandard Library
  Bug

  ispc/ispc#3812 · Filter by author zephyr111 opened on Apr 26, 2026

• Possible performance loss with inlined functions

  CodegenPerformanceStandard Library
  Enhancement

  ispc/ispc#3804 · Filter by author zephyr111 opened on Apr 23, 2026
  2

  

• Split stdlib.ispc

  Code CleanupsStandard Library
  Task

  ispc/ispc#3775 · Filter by author nurmukhametov opened on Apr 1, 2026

• Inefficient shuffle implementation

  CodegenPerformanceStandard Library
  Enhancement

  ispc/ispc#3771 · Filter by author zephyr111 opened on Mar 29, 2026
  7

  

• ISPC not generating fma instruction for last mul+add combination when compiling with -O0

  CodegenWindows
  ispc/ispc#3757 · Filter by author FelixK15 opened on Feb 26, 2026
  2

• Ninja build and Cmake 3.19+ not caching build files

  Building Compiler
  ispc/ispc#3743 · Filter by author ZilverBlade opened on Feb 17, 2026
  7

  

• Install ISPC via PyPI?

  Building Compiler
  ispc/ispc#3741 · Filter by author janbridley opened on Feb 16, 2026
  11

  

• A performance regression on ARM64 NEON (neon-i32x4 target) when compiling code with varying pointer gathers in nested loops

  ARM / NEONCodegenPerformance
  Bug

  ispc/ispc#3721 · Filter by author aneshlya opened on Jan 26, 2026

• constexpr design proposal

  Frontend / Parser
  ispc/ispc#3697 · Filter by author dbabokin opened on Jan 15, 2026
  12

  

• Inefficient codegen for varying popcnt on AVX2

  CodegenPerformanceStandard Library
  Enhancement

  ispc/ispc#3676 · Filter by author aneshlya opened on Dec 19, 2025
  16

• -macosx_version_min has been renamed to -macos_version_min warning

  Building CompilermacOS
  ispc/ispc#3655 · Filter by author dbabokin opened on Dec 2, 2025
  4