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Add support for platforms without 128bit integers by using boost library #13

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04d8668
Add support for platforms without 128bit integers by using boost library
Solpatium Aug 15, 2022
6d372d6
Add hash of boost library
Solpatium Aug 15, 2022
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27 changes: 27 additions & 0 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,33 @@ include_directories(${GTEST_INCLUDE_DIRS})
enable_testing()
include_directories("${CMAKE_SOURCE_DIR}/src")

# Include boost in case target platform doesn't support uint128
INCLUDE(CheckCXXSourceCompiles)
check_cxx_source_compiles("
int main() {
__uint128_t a = 0;
return 0;
}" HAVE_UINT128)

if (NOT HAVE_UINT128)
FetchContent_Declare(
boostorg
URL https://boostorg.jfrog.io/artifactory/main/release/1.79.0/source/boost_1_79_0.tar.gz
URL_HASH SHA256=273f1be93238a068aba4f9735a4a2b003019af067b9c183ed227780b8f36062c
)

FetchContent_GetProperties(boostorg)
if (NOT boostorg_POPULATED)
FetchContent_Populate(boostorg)
endif ()

include_directories(${boostorg_SOURCE_DIR})

# For Windows: Prevent overriding the parent project's compiler/linker settings
set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
FetchContent_MakeAvailable(boostorg)
endif()

if (NOT DEFINED CMAKE_BUILD_TYPE)
set(CMAKE_BUILD_TYPE Debug)
endif()
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8 changes: 8 additions & 0 deletions src/starkware/algebra/big_int.h
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Expand Up @@ -13,6 +13,14 @@
#include "starkware/utils/error_handling.h"
#include "starkware/utils/prng.h"

/*
Support for 32-bit builds, where __uint128_t isn't defined.
*/
#ifndef __SIZEOF_INT128__
#include <boost/multiprecision/cpp_int.hpp>
typedef boost::multiprecision::uint128_t __uint128_t;
#endif

namespace starkware {

static constexpr inline __uint128_t Umul128(uint64_t x, uint64_t y) {
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