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Enable optional AVX2/march support #18

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Merged
bugparty merged 1 commit into from
Jun 7, 2025
Merged

Enable optional AVX2/march support #18

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20 changes: 20 additions & 0 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,26 @@ elseif(MSVC)
message(WARNING "BMI1 support is not available for MSVC in this configuration.")
endif()

# Detect AVX2 or native CPU optimizations and enable them if available
if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" OR CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
include(CheckCXXCompilerFlag)
check_cxx_compiler_flag("-march=native" COMPILER_SUPPORTS_MARCH_NATIVE)
if(COMPILER_SUPPORTS_MARCH_NATIVE)
add_compile_options(-march=native)
else()
check_cxx_compiler_flag("-mavx2" COMPILER_SUPPORTS_AVX2)
if(COMPILER_SUPPORTS_AVX2)
add_compile_options(-mavx2)
endif()
endif()
elseif(MSVC)
include(CheckCXXCompilerFlag)
check_cxx_compiler_flag("/arch:AVX2" COMPILER_SUPPORTS_AVX2)
if(COMPILER_SUPPORTS_AVX2)
add_compile_options(/arch:AVX2)
endif()
endif()

# Optionally disable bounds checking in the bitvector implementation

# Enable testing
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5 changes: 4 additions & 1 deletion README.md
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Expand Up @@ -4,7 +4,10 @@ This repository provides a small bit vector implementation along with tests and

## Running the benchmarks without bounds checking

Bounds checking is enabled by default. To benchmark without checks, configure and build with (this defines `BITVECTOR_NO_BOUND_CHECK`):
Bounds checking is enabled by default. To benchmark without checks, configure
and build with (this defines `BITVECTOR_NO_BOUND_CHECK`). The build system now
detects whether the compiler and host CPU support AVX2 or other native
instructions and enables them when possible:

```bash
cmake -S . -B build -DBITVECTOR_NO_BOUND_CHECK=ON -DCMAKE_BUILD_TYPE=Release
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