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@pveleskopvelesko released this 20 May 17:07
· 61 commits to main since this release
v1.3.0
ed3bc0c

chipStar v1.3 Release Notes

Overview

v1.3 is a major release with approximately 700 commits since v1.2.1. The main user-visible changes are official CMake integration, macOS support, broader LLVM and HIP compatibility, expanded HIP runtime API coverage, HIPRTC improvements, and many correctness and performance fixes.

New Platform Support

MacOS (ARM64 + x86)

  • macOS is now a supported chipStar platform, including Apple CPU Silicon via PoCL
  • LLVM 21/22-based macOS builds are supported
  • Runtime fixes make queue handling and unified-memory behavior work correctly on macOS

Intel Arc B570 / GPU Kernel 6.8+

  • Intel Arc B570 systems are supported with newer Linux kernels
  • Fixed timestamp handling on devices with 64-bit timestamps

ARM Mali GPU

  • Device-side printf is now supported on Mali GPUs with the cl_arm_printf extension
  • Workarounds for Mali driver deadlock (flush queues before finish, clFlush for marker/callback events)

Supported Libraries

install_chipstar.py now installs chipStar together with supported CHIP-SPV library ports.

Platform-Independent Libraries

  • rocPRIM - Parallel primitives
  • hipCUB - CUB-like primitives for HIP
  • rocThrust - Thrust parallel algorithms
  • rocRAND - Random number generation
  • hipRAND - HIP random number interface
  • rocSPARSE (new) - Sparse matrix operations
  • hipSPARSE (new) - HIP sparse matrix interface
  • hipMM (new) - HIP memory manager (RMM port)

Intel MKL-Based Libraries

Application Support

LLVM and HIP Compatibility

  • Added support for LLVM 20, LLVM 21, and LLVM 22
  • LLVM 22's integrated SPIR-V backend is detected automatically and is the default/preferred option
  • Added compatibility work for upcoming LLVM 23 / Clang offload driver changes
  • Updated the bundled HIP stack to HIP 7.2.0 (chipStar-hip-7)
  • Fixed HIP 7 API signature changes, including hipMemcpyHtoD/HtoDAsync
  • Fixed HIPRTC API parameter types for compatibility with newer HIP headers

Build and Project Integration

  • chipStar is officially supported by CMake starting with CMake 4.3.0, making it easier for projects to use chipStar through CMake's HIP language support
  • New install_chipstar.py with unified install dir, --with-tests flag, rocPRIM prefix support
  • install_chipstar.py now builds from cwd when run inside the repo
  • Fixed make install failure on macOS (hardcoded .so extension)
  • Excluded spdlog from install to avoid downstream symbol conflicts; renamed namespace to chipStar_spdlog
  • Installed hip-lang-config.cmake for CMake HIP language support
  • Installed FindHIP.cmake

New Features

Async Memory Allocation

  • Implemented hipMallocAsync, hipFreeAsync, hipMallocFromPoolAsync

Managed Memory

  • Implemented hipMemAdvise and hipMemRangeGetAttribute(s)
  • Implemented hipMemPrefetchAsync
  • OpenCL: use clHostMemAllocINTEL for managed memory; added clEnqueueMigrateMemINTEL support
  • Level0/OpenCL: managed memory support reporting

Device-Side malloc/free

  • Implemented device-side __chip_malloc / __chip_free with C++ new/delete wrappers

HIP Graphs

  • Fixed hipGraphAddDependencies/RemoveDependencies to iterate from[i]→to[i] pairs correctly
  • Added null-pointer parameter validation across hipGraph* API functions
  • Fixed getCaptureStatus() (was hardcoded to return None)
  • Fixed hipStreamWaitEvent incorrectly flipping stream capture status
  • Fixed hipStreamEndCapture returning IllegalState (401)

Separate Compilation

  • Handle -dc flag in hipcc for separate compilation workflows (#893)
  • Support unbundling of static device libraries in HIPSPV toolchain

HIPRTC Improvements

  • Runtime compilation handles more SPIR-V constructs correctly
  • HIPRTC compilation-output caching support
  • Auto-include fp16 headers in HIPRTC
  • Device variable registration for compiled modules (constant memory in HIPRTC)
  • Shell metacharacter escaping in hiprtcCompileProgram
  • Fixed hipRTC compile error with Clang-22

fp16 / Device Library

  • Added float→half conversion functions with rounding modes
  • Added __device__/__host__ decorators to fp16 header
  • Fixed raw bit extraction and error messages in fp16_conversion.hpp
  • Fixed __ocml_cvtrtn_f16_f32 and other missing conversion functions
  • Added float/double atomicMin/atomicMax devicelib implementations

SPIR-V Compatibility

  • Promote narrow integer kernel args to i32 for SPIR-V conformance (#849)
  • Inline kernel arg promotion to avoid wrapper function pattern (#849)
  • Improved linking behavior for programs that use atomics and ballot operations

SYCL Interop

  • Fixed hip_sycl_interop and hip_sycl_interop_no_buffers for Level Zero backend with MKL 2025 UR API

Notable Bug Fixes

  • Memory-copy validation is stricter and more compatible with HIP behavior, including invalid pointer handling and hipMemcpyDefault direction inference.
  • Atomics and ballot intrinsics received several correctness fixes, including atomicMin/atomicMax on floating-point types, __chip_all(), and __byte_perm.
  • Stream, event, and queue synchronization fixes address hangs and races seen with OpenCL, Level Zero, ARM Mali, and default-stream behavior.
  • Module loading/unloading and backend selection are more robust, including fixes for default backend selection and hipModuleUnload.
  • C and CMake integration fixes improve mixed C/HIP projects, CMake HIP language support, and downstream package integration.

Submodule Updates

  • HIP → 7.2.0 (chipStar-hip-7)
  • ROCm-Device-Libs: dynamic datalayout from clang; irif.h type-punning fix
  • HIPCC: various fixes including -no-hip-rt, LLVM 21, shell metacharacter escaping
  • PoCL support updated to version 7

Full Changelog

For the complete list of changes, see:

git log v1.2.1..v1.3
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