ispc/ispc v1.22.0

=== v1.22.0 === (15 November 2023)

on GitHub

ISPC release with template operators support; improved debugging experience of ISPC code on Windows; multiple stability and performance fixes and more. The release is based on patched LLVM 16.0.6.

ISPC distribution changes:

• ISPC binaries were compiled with LTO by Clang/LLVM toolchain on all supported platforms and architectures using superbuild. ISPC binaries got faster a few percent in average.
• Examples were excluded from ISPC archives. They are placed alongside as separate archives ispc-examples-v1.22.0.zip and ispc-examples-v1.22.0.tar.gz.

Language changes:

• Added support for template operators.
• Revised the usage of function specifiers with templates. For more details please refer to Function Templates section of documentation.

Infrastructure changes:

• Release built with LTO (except aarch64 Linux).
• Supported building ISPC with LLVM 17 although GPU support wasn't tested.

New compiler switches:

• --dwarf-version switch accepts DWARF 5 version.
• --dwarf-version switch forces DWARF format debug info generation on Windows. It allows to debug ISPC code linked with MinGW generated code (#2129).

Bug fixes:

• Fixed performance regression on GPU caused by missed memory effects for genx intrinsics declarations.
• Fixed performance regression caused by change in the loop unswitch LLVM pass.
• Fixed C compatibility of ISPC generated headers (#2650, #2652).
• Added unwind table to ISPC generated functions for Windows targets. It fixed issues with incorrect backtrace during debugging and profiling (#2345, #1318).
• Fixed emitted code for negate of short float vectors (#2628).
• Fixed several issues that were related to the usage of bool in different cases (#2272, #2333, #2367, #2689).

Recommended versions of Runtime Dependencies when targeting GPU:
Linux:

• Intel(R) Graphics Compute Runtime https://github.com/intel/compute-runtime/releases/tag/23.30.26918.9
• Level Zero Loader https://github.com/oneapi-src/level-zero/releases/tag/v1.14.0
• Threading Building Blocks (TBB)

Alternatively, you can use a validated gfx driver stack supporting Intel® Arc™ available at https://dgpu-docs.intel.com/driver/installation.html

Windows:

• Intel(R) Graphics Windows(R) DCH Drivers 31.0.101.4826 https://www.intel.com/content/www/us/en/download/785597/788440/intel-arc-iris-xe-graphics-windows.html
• Level Zero Loader https://github.com/oneapi-src/level-zero/releases/tag/v1.14.0
• OpenCL™ Offline Compiler (OCLOC) https://www.intel.com/content/www/us/en/developer/articles/tool/oneapi-standalone-components.html (this is needed for AoT compilation on Windows only)
• Supported GPU platforms: Intel(R) Arc Graphics, 11th-13th Gen Intel(R) Core processor graphics

Components revisions used in GPU-enabled build:

• KhronosGroup/SPIRV-LLVM-Translator@8ac46249
• intel/vc-intrinsics@77f069b7
• oneapi-src/level-zero@37363a45 (v1.14.0)
• llvm/llvm-project@7cbf1a25 (llvmorg-16.0.6) + patches from llvm_patches folder