More SIMD for scanning Node256 with 32-bit versions

CMakeLists.txt

@@ -59,6 +59,10 @@ cmake_pop_check_state()
 
 option(USE_SIMD_FALLBACK
        "Use fallback implementations of functions that use SIMD" OFF)
+option(
+  USE_32_BIT_VERSIONS,
+  "Store 32 bit versions internally, and rely on versions never being different by more than 2e9"
+  OFF)
 
 # This is encouraged according to
 # https://valgrind.org/docs/manual/manual-core-adv.html#manual-core-adv.clientreq
@@ -103,6 +107,10 @@ if(NOT USE_SIMD_FALLBACK)
   endif()
 endif()
 
+if(USE_32_BIT_VERSIONS)
+  add_compile_definitions(INTERNAL_VERSION_32_BIT=1)
+endif()
+
 set(CMAKE_CXX_IMPLICIT_LINK_LIBRARIES "")
 
 add_library(${PROJECT_NAME}-object OBJECT ConflictSet.cpp)