Configure LTO in a portable way

CMake has features to handle LTO for different compilers and
platforms. Better to use this than to add our own lto options.

Author: mhucka

CMakeLists.txt

@@ -76,6 +76,10 @@ elseif(APPLE AND NOT CMAKE_APPLE_SILICON_PROCESSOR)
     check_cpu_support("sse4_1" CPU_SUPPORTS_SSE4)
 endif()
 
+# Configure LTO for compilers that support it.
+include(CheckIPOSupported)
+check_ipo_supported(RESULT HAVE_LTO)
+
 # ~~~~~ Configure the build ~~~~~
 
 if(WIN32)
@@ -84,6 +88,10 @@ else()
     add_compile_options(-O3 -D_GLIBCXX_USE_CXX11_ABI=1)
 endif()
 
+if(HAVE_LTO)
+    set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
+endif()
+
 include(dev_tools/cmake/GetPybind11.cmake)
 
 # Always build the basic part.

pybind_interface/avx512/CMakeLists.txt.avx10

@@ -0,0 +1,31 @@
+# Copyright 2019 Google LLC. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+cmake_minimum_required(VERSION 3.31)
+project(qsim)
+
+IF (WIN32)
+    add_compile_options(/arch:AVX512)
+ELSEIF(HAVE_AVX512_10)
+    add_compile_options(-mavx10.1-512 -mbmi2)
+ELSE()
+    add_compile_options(-mavx512f -mbmi2)
+ENDIF()
+
+INCLUDE(../../dev_tools/cmake/GetPybind11.cmake)
+pybind11_add_module(qsim_avx512 pybind_main_avx512.cpp)
+
+if(OpenMP_CXX_FOUND)
+    target_link_libraries(qsim_avx512 PUBLIC OpenMP::OpenMP_CXX)
+endif()

pybind_interface/sse/CMakeLists.txt

@@ -57,4 +57,3 @@ pybind11_add_module(qsim_sse pybind_main_sse.cpp)
 if(OpenMP_CXX_FOUND)
     target_link_libraries(qsim_sse PUBLIC pybind11::headers OpenMP::OpenMP_CXX)
 endif()
-