From 2f1983682842e57ed4d27e5ace8cfb452d247e23 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ja=C3=ABl=20Champagne=20Gareau?= <gareau_jael@hotmail.com>
Date: Mon, 21 Jul 2025 20:11:56 -0400
Subject: [PATCH] add script to compare perf. of different x86 level

---
 .gitignore                   |  5 ++---
 CMakeLists.txt               | 19 ++++++++++++++-----
 scripts/test_x86_levels.bash | 26 ++++++++++++++++++++++++++
 3 files changed, 42 insertions(+), 8 deletions(-)
 create mode 100755 scripts/test_x86_levels.bash

diff --git a/.gitignore b/.gitignore
index 7752a08..c98d058 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,10 +1,9 @@
-build
-build_debug
-build_script
+build*
 .gdb_history
 outputs
 tags
 compile_commands.json
 .cache
+perf.data*
 *.log
 **/__pycache__
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 62217d4..48a18ca 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,12 +11,21 @@ if(CMAKE_VERSION VERSION_GREATER_EQUAL "3.30")
 endif()
 
 include(CheckCXXCompilerFlag)
-unset(SIMPLE_FAST_FLOAT_BENCHMARK_COMPILER_SUPPORTS_MARCH_NATIVE CACHE)
-CHECK_CXX_COMPILER_FLAG(-march=native SIMPLE_FAST_FLOAT_BENCHMARK_COMPILER_SUPPORTS_MARCH_NATIVE)
-if(SIMPLE_FAST_FLOAT_BENCHMARK_COMPILER_SUPPORTS_MARCH_NATIVE)
-    add_compile_options(-march=native)
+set(SIMPLE_FAST_FLOAT_BENCHMARK_MARCH "" CACHE STRING
+    "Set -march value for benchmarks (e.g. native, x86-64-v4, etc)")
+
+if(NOT SIMPLE_FAST_FLOAT_BENCHMARK_MARCH)
+  set(_SFF_MARCH_FLAG "-march=native")
+else()
+  set(_SFF_MARCH_FLAG "-march=${SIMPLE_FAST_FLOAT_BENCHMARK_MARCH}")
+endif()
+
+CHECK_CXX_COMPILER_FLAG(${_SFF_MARCH_FLAG} _SFF_MARCH_SUPPORTED)
+if(_SFF_MARCH_SUPPORTED)
+  add_compile_options(${_SFF_MARCH_FLAG})
+  message(STATUS "Compiling with ${_SFF_MARCH_FLAG}")
 else()
-     message(STATUS "native target not supported")
+  message(STATUS "${_SFF_MARCH_FLAG} not supported, proceeding without -march flag.")
 endif()
 
 if (NOT CMAKE_BUILD_TYPE AND NOT SANITIZE)
diff --git a/scripts/test_x86_levels.bash b/scripts/test_x86_levels.bash
new file mode 100755
index 0000000..734618c
--- /dev/null
+++ b/scripts/test_x86_levels.bash
@@ -0,0 +1,26 @@
+#!/bin/bash
+
+CPU=$1
+OutputDir="outputs/${CPU}"
+Algorithms="schubfach,dragonbox"
+
+if [ -z "$1" ]; then
+  echo "Usage: $0 <CPU>"
+  exit 1
+fi
+
+mkdir -p ${OutputDir}
+for v in x86-64 x86-64-v2 x86-64-v3 x86-64-v4 native; do
+  cmake -B build-${v} -DSIMPLE_FAST_FLOAT_BENCHMARK_MARCH=${v}
+  cmake --build build-${v}
+
+  echo "Running benchmarks for ${v} on ${CPU}..."
+  ./build-${v}/benchmarks/benchmark -f data/canada.txt -a ${Algorithms} > ${OutputDir}/${CPU}_g++_canada_none_${v}.raw
+  ./build-${v}/benchmarks/benchmark -f data/mesh.txt -a ${Algorithms} > ${OutputDir}/${CPU}_g++_mesh_none_${v}.raw
+  ./build-${v}/benchmarks/benchmark -a ${Algorithms} > ${OutputDir}/${CPU}_g++_uniform_01_none_${v}.raw
+done
+
+for f in ${OutputDir}/*.raw; do
+  python3 scripts/latex_table.py "$f" > "${f%.raw}.tex"
+  echo "Converted $f to ${f%.raw}.tex"
+done