[WIP][POC] Pfor encoding

.gitignore

@@ -94,3 +94,6 @@ rat.txt
 
 # for ODBC DLL
 *.rc
+
+# Local out-of-tree benchmark build dir
+cpp/build-bench/

cpp/cmake_modules/SetupCxxFlags.cmake

@@ -633,21 +633,12 @@ endif()
 
 if(NOT MSVC)
   set(C_RELEASE_FLAGS "")
-  if(CMAKE_C_FLAGS_RELEASE MATCHES "-O3")
-    string(APPEND C_RELEASE_FLAGS " -O2")
-  endif()
+  # Local override: keep -O3 from CMake's default Release flags for the
+  # pfor benchmark — the bench is sensitive to inlining/unrolling that
+  # -O3 enables. Upstream Arrow downgrades to -O2 here; we skip that.
   set(CXX_RELEASE_FLAGS "")
-  if(CMAKE_CXX_FLAGS_RELEASE MATCHES "-O3")
-    string(APPEND CXX_RELEASE_FLAGS " -O2")
-  endif()
   set(C_RELWITHDEBINFO_FLAGS "")
-  if(CMAKE_C_FLAGS_RELWITHDEBINFO MATCHES "-O3")
-    string(APPEND C_RELWITHDEBINFO_FLAGS " -O2")
-  endif()
   set(CXX_RELWITHDEBINFO_FLAGS "")
-  if(CMAKE_CXX_FLAGS_RELWITHDEBINFO MATCHES "-O3")
-    string(APPEND CXX_RELWITHDEBINFO_FLAGS " -O2")
-  endif()
   if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
     string(APPEND C_RELEASE_FLAGS " -ftree-vectorize")
     string(APPEND CXX_RELEASE_FLAGS " -ftree-vectorize")

cpp/src/arrow/util/CMakeLists.txt

@@ -118,6 +118,17 @@ add_arrow_test(threading-utility-test
                test_common.cc
                thread_pool_test.cc)
 
+add_arrow_test(pfor-test
+               SOURCES
+               pfor/pfor_test.cc
+               pfor/pfor.cc
+               pfor/pfor_wrapper.cc)
+
+add_arrow_benchmark(pfor/pfor_benchmark
+                    EXTRA_SOURCES
+                    pfor/pfor.cc
+                    pfor/pfor_wrapper.cc)
+
 add_arrow_benchmark(bit_block_counter_benchmark)
 add_arrow_benchmark(bit_util_benchmark)
 add_arrow_benchmark(bitmap_reader_benchmark)