Halide Files

Changes Of Note since Halide 17

• Ring-buffering now supported in schedules (Func::ring_buffer()). This is distinct from fold_storage in that it folds across time (the loop variables) rather than folding across space (the pure vars of the Func).
• Fixed a longstanding bug in lossless_cast()
• Lots of fixes for Vulkan backend
• OpenGLCompute is no longer supported
• Added support for ARM SVE2
• Added (basic) support for Intel APX and AVX10
• Added support for Hexagon HVX v68
• Added support for numpy's .npy format to .debug_to_file() and the code in halide_image_io.h
• Python bindings now support bfloat and int64 properly
• Hacky code that auto-named Funcs, Vars etc via DWARF introspection was removed
• The profiler was revamped to behave better when multiple Halide pipelines are in flight at the same time.
• Numerous lowering passes were sped up, resulting in faster compilation for large pipelines. However, time spent in LLVM is still the long pole for most pipelines.
• Fixed-point instruction selection has been improved via tracking constant integer bounds of expressions.
• Adds feature detection for ARM CPUs to the runtime library and to the host target feature computation. Supports Windows, macOS, Linux, iOS, and Android.

Deprecations / Removals

• tuple_select() has been removed in favor of overloads to select().
• Various fixed-point operators have been removed from the Halide::Internal namespace and are now in the public Halide namespace.

What's Changed

• Detect ARM CPU features for host target and in runtime (#8298)
• Scheduling directive to support ring buffering by @vksnk in https://github.com/halide/Halide/pull/7967
• Don't add ring_buffer semaphores if the function is not scheduled as async by @vksnk in https://github.com/halide/Halide/pull/8015
• Quick fix for crash that is occurring in SVE2 tests. by @zvookin in https://github.com/halide/Halide/pull/8020
• Don't use variable-length arrays by @steven-johnson in https://github.com/halide/Halide/pull/8021
• Set warnings on tests as well as src by @steven-johnson in https://github.com/halide/Halide/pull/8022
• Stronger chain detection in LoopCarry pass by @vksnk in https://github.com/halide/Halide/pull/8016
• adds mappings for f16 variants of halide float math by @mikewoodworth in https://github.com/halide/Halide/pull/8029
• Require LLVM >= 16.0 by @steven-johnson in https://github.com/halide/Halide/pull/8003
• Add test for [#8029] by @steven-johnson in https://github.com/halide/Halide/pull/8032
• Tweak the Printer code in runtime for smaller code by @steven-johnson in https://github.com/halide/Halide/pull/8023
• Fix bounds_of_nested_lanes by @abadams in https://github.com/halide/Halide/pull/8039
• Track whether or not let expressions failed to solve in solver by @abadams in https://github.com/halide/Halide/pull/7982
• Fix type error in VectorizeLoops by @abadams in https://github.com/halide/Halide/pull/8055
• Update makefile to use test/common/terminate_handler.cpp by @abadams in https://github.com/halide/Halide/pull/8066
• add unsafe_promise_clamped by @wraith1995 in https://github.com/halide/Halide/pull/8071
• Don't require Halide_WebGPU when using wasm (#8063) by @steven-johnson in https://github.com/halide/Halide/pull/8065
• Outsmart the LLVM optimizer by @steven-johnson in https://github.com/halide/Halide/pull/8073
• Add hexagon_benchmarks app for CMake builds by @prasmish in https://github.com/halide/Halide/pull/8069
• Fix bool conversion bug in Vulkan code generator by @derek-gerstmann in https://github.com/halide/Halide/pull/8067
• Better validation of gpu schedules by @abadams in https://github.com/halide/Halide/pull/8068
• Add an easy way to print vectors in debug output. by @zvookin in https://github.com/halide/Halide/pull/8072
• [WebGPU] Update to latest native headers by @jrprice in https://github.com/halide/Halide/pull/8081
• Remove OpenGLCompute by @steven-johnson in https://github.com/halide/Halide/pull/8077
• Add checks to prevent people from using negative split factors by @abadams in https://github.com/halide/Halide/pull/8076
• Fix rfactor adding too many pure loops by @abadams in https://github.com/halide/Halide/pull/8086
• Forward the partition methods from generator outputs by @abadams in https://github.com/halide/Halide/pull/8090
• Parallelize some tests by @abadams in https://github.com/halide/Halide/pull/8078
• Allow disabling of mutlithreading in simd op check by @steven-johnson in https://github.com/halide/Halide/pull/8096
• clang does not support _Float16 when targeting i386 by @LebedevRI in https://github.com/halide/Halide/pull/8085
• tests: correctness/float16_t: mark __extendhfsf2 with default visibility by @LebedevRI in https://github.com/halide/Halide/pull/8084
• Fix reduce_expr_modulo of vector in Solve.cpp by @abadams in https://github.com/halide/Halide/pull/8089
• [Vulkan] Region allocator fixes for memory requirements and allocations by @derek-gerstmann in https://github.com/halide/Halide/pull/8087
• Ensure string(REPLACE) is called with the right number of arguments by @alexreinking in https://github.com/halide/Halide/pull/8097
• Strip asserts right at the end of lowering by @abadams in https://github.com/halide/Halide/pull/8094
• Fix clang-tidy error in runtime.printer.h (parameter shadows member) by @steven-johnson in https://github.com/halide/Halide/pull/8074
• Fix an issue where the Halide compiler hits an internal error for bool types in widening intrinsics. by @zvookin in https://github.com/halide/Halide/pull/8099
• Small Tutorial Fix by @2022tgoel in https://github.com/halide/Halide/pull/8111
• Optionally print the time taken by each lowering pass by @abadams in https://github.com/halide/Halide/pull/8116
• Do less redundant work in UnpackBuffers by @abadams in https://github.com/halide/Halide/pull/8104
• Avoid redundant scope lookups by @abadams in https://github.com/halide/Halide/pull/8103
• Add Intel APX and AVX10 target flags and LLVM attribute setting. by @zvookin in https://github.com/halide/Halide/pull/8052
• Use a caching version of stmt_uses_vars in TightenProducerConsumer nodes by @abadams in https://github.com/halide/Halide/pull/8102
• Fix hoist_storage not handling condition correctly. by @abadams in https://github.com/halide/Halide/pull/8123
• Rewrite the skip stages lowering pass by @abadams in https://github.com/halide/Halide/pull/8115
• Remove two dead vars from the Makefile by @abadams in https://github.com/halide/Halide/pull/8125
• Add support for setting the default allocator and deallocator functions in Halide::Runtime::Buffer. by @mcourteaux in https://github.com/halide/Halide/pull/8132
• Make realization order invariant to unique_name suffixes by @abadams in https://github.com/halide/Halide/pull/8124
• Make gpu thread and block for loop names opaque by @abadams in https://github.com/halide/Halide/pull/8133
• Add class template type deduction guides to avoid CTAD warning. by @zvookin in https://github.com/halide/Halide/pull/8135
• [vulkan] Add conform API methods to memory allocator to fix block allocations by @derek-gerstmann in https://github.com/halide/Halide/pull/8130
• Add sobel in hexagon benchmarks app for CMake builds by @prasmish in https://github.com/halide/Halide/pull/8127
• Handle loads of broadcasts in FlattenNestedRamps by @abadams in https://github.com/halide/Halide/pull/8139
• Use python itself to get the extension suffix, not python-config by @abadams in https://github.com/halide/Halide/pull/8148
• Rewrite the pass that adds mutexes for atomic nodes by @abadams in https://github.com/halide/Halide/pull/8105
• Feature: mark a Func as no_profiling, to prevent injection of profiling. (2nd implementation) by @mcourteaux in https://github.com/halide/Halide/pull/8143
• Bound allocation extents for hoist_storage using loop variables one-by-one by @vksnk in https://github.com/halide/Halide/pull/8154
• Support for ARM SVE2. by @zvookin in https://github.com/halide/Halide/pull/8051
• Fix two compute_with bugs. by @abadams in https://github.com/halide/Halide/pull/8152
• Python bindings: add_python_test(): do set HL_JIT_TARGET too by @LebedevRI in https://github.com/halide/Halide/pull/8156
• fix ub in lower rounding shift right by @abadams in https://github.com/halide/Halide/pull/8173
• Add some missing _Float16 support by @steven-johnson in https://github.com/halide/Halide/pull/8174
• Add conversion code for Float16 that was missed in [#8174] by @steven-johnson in https://github.com/halide/Halide/pull/8178
• Tighten bounds of abs() by @rootjalex in https://github.com/halide/Halide/pull/8168
• Clarify the meaning of Shuffle::is_broadcast() by @abadams in https://github.com/halide/Halide/pull/8158
• Add .npy support to halide_image_io by @steven-johnson in https://github.com/halide/Halide/pull/8175
• Update Hexagon Install Instructions by @FabianSchuetze in https://github.com/halide/Halide/pull/8182
• Add .npy support to debug_to_file() by @steven-johnson in https://github.com/halide/Halide/pull/8177
• Don't print on parallel task entry/exit with -debug flag by @abadams in https://github.com/halide/Halide/pull/8185
• Fix corner case in if_then_else simplification by @abadams in https://github.com/halide/Halide/pull/8189
• Rewrite IREquality to use a more compact stack instead of deep recursion by @abadams in https://github.com/halide/Halide/pull/8198
• [HEXAGON] Keep support for hexagon_remote/Makefile by @aankit-quic in https://github.com/halide/Halide/pull/8186
• Faster substitute_facts by @abadams in https://github.com/halide/Halide/pull/8200
• Make Interval::is_single_point check for deep equality by @abadams in https://github.com/halide/Halide/pull/8202
• Refactor ConstantInterval by @abadams in https://github.com/halide/Halide/pull/8179
• Faster vars used tracking in simplify let visitor by @abadams in https://github.com/halide/Halide/pull/8205
• More aggressively unify duplicate lets by @abadams in https://github.com/halide/Halide/pull/8204
• Update debug_to_file API to remove type_code by @steven-johnson in https://github.com/halide/Halide/pull/8183
• [x86 & HVX & WASM] Use bounds inference for saturating_narrow instruction selection by @rootjalex in https://github.com/halide/Halide/pull/7805
• Insert apparently-missing break; in IREquality.cpp by @steven-johnson in https://github.com/halide/Halide/pull/8211
• Fix Reinterpret cmp in IREquality by @rootjalex in https://github.com/halide/Halide/pull/8217
• Fix give-up case in ModulusRemainder by @abadams in https://github.com/halide/Halide/pull/8221
• Fix for top-of-tree LLVM by @steven-johnson in https://github.com/halide/Halide/pull/8223
• Add some EVAL_IN_LAMBDAs to Simplify_Sub.cpp by @abadams in https://github.com/halide/Halide/pull/8230
• Fix saturating add matching in associativity checking by @abadams in https://github.com/halide/Halide/pull/8220
• Add HVX_v68 target to support Hexagon HVX v68. by @wangcheng22 in https://github.com/halide/Halide/pull/8232
• Mark host_dirty() and device_dirty() with no_discard. by @mcourteaux in https://github.com/halide/Halide/pull/8248
• Rework the simplifier to use ConstantInterval for bounds by @abadams in https://github.com/halide/Halide/pull/8222
• Remove max size assert from Anderson2021 by @jansel in https://github.com/halide/Halide/pull/8253
• Expose BFloat in Python bindings by @jansel in https://github.com/halide/Halide/pull/8255
• Fix Metal handling for float16 literals by @shoaibkamil in https://github.com/halide/Halide/pull/8260
• Python binding support for int64 literals by @jansel in https://github.com/halide/Halide/pull/8254
• Report useful error to user if the promise_clamp all fails to losslessly cast. by @mcourteaux in https://github.com/halide/Halide/pull/8238
• It's generally a bad idea for simplifier rules to multiply constants by @abadams in https://github.com/halide/Halide/pull/8234
• [vulkan] Fix Vulkan SIMT mappings for GPU loop vars. by @derek-gerstmann in https://github.com/halide/Halide/pull/8259
• Stop region costs from complaining about new intrinsics by @abadams in https://github.com/halide/Halide/pull/8262
• No longer silently hide errors in Metal completion handlers (alternative approach) by @shoaibkamil in https://github.com/halide/Halide/pull/8240
• Use upstream interface for consuming SPIR-V by @alexreinking in https://github.com/halide/Halide/pull/8265
• Fix OpenCL positive and negative INF constants. by @alexreinking in https://github.com/halide/Halide/pull/8266
• scoped_truth for the loop variable being always less than the loop extent. by @mcourteaux in https://github.com/halide/Halide/pull/8306
• Fix incorrect type in emulation of float16 is_inf/nan by @abadams in https://github.com/halide/Halide/pull/8310
• Don't try to codegen predicated atomic stores by @abadams in https://github.com/halide/Halide/pull/8285
• Add ability to pass explicit RDom to Function::define_update by @abadams in https://github.com/halide/Halide/pull/8284
• [vulkan] Dynamically load Vulkan loader library. Avoid Validation Layer crash on exit. by @derek-gerstmann in https://github.com/halide/Halide/pull/8289
• Remove Introspection by @steven-johnson in https://github.com/halide/Halide/pull/8273
• Per-pipeline-invocation profiling by @abadams in https://github.com/halide/Halide/pull/8153
• Fix device slices for Buffer with fixed dimensionality in template. by @mcourteaux in https://github.com/halide/Halide/pull/8313
• Remove deprecated operators by @steven-johnson in https://github.com/halide/Halide/pull/8321
• Provide a minimum OS version for MachO objects by @alexreinking in https://github.com/halide/Halide/pull/8323
• Fix horrifying bug in lossless_cast of a subtract by @abadams in https://github.com/halide/Halide/pull/8155

New Contributors

• @tylerhou made their first contribution in https://github.com/halide/Halide/pull/8013
• @wraith1995 made their first contribution in https://github.com/halide/Halide/pull/8071
• @prasmish made their first contribution in https://github.com/halide/Halide/pull/8069
• @2022tgoel made their first contribution in https://github.com/halide/Halide/pull/8111
• @FabianSchuetze made their first contribution in https://github.com/halide/Halide/pull/8182
• @FindHao made their first contribution in https://github.com/halide/Halide/pull/8322

Full Changelog: https://github.com/halide/Halide/compare/v17.0.2...v18.0.0