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citra_common: Enable SSE4.2 on x86_64 builds

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Enables the use of SSE4.2 instructions on x86_64 CPUs, allowing
compilers to automatically vectorize some loops on citra_common.
A CMake toggle ENABLE_SSE42 (ON by default) has been added
to enable this behaviour.

This change breaks compatibility with CPUs that do not have
SSE4.2 instructions. All modern CPUs (from 2011 onwards) should
always have these instructions. Manual compilation will be
needed for older CPUs.

A message has been added to report if the CPU is incompatible
when starting the emulator.

Co-authored-by: OpenSauce04 <opensauce04@gmail.com>
This commit is contained in:
PabloMK7 2025-05-29 22:21:05 +02:00 • committed by OpenSauce
parent 9ecd26d2ce
commit 88b3dff278
4 changed files with 73 additions and 0 deletions
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11
CMakeLists.txt
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@ -105,6 +105,8 @@ option(USE_DISCORD_PRESENCE "Enables Discord Rich Presence" OFF)
option(ENABLE_MICROPROFILE "Enables microprofile capabilities" OFF)
option(ENABLE_SSE42 "Enable SSE4.2 optimizations on x86_64" ON)
# Compile options
CMAKE_DEPENDENT_OPTION(COMPILE_WITH_DWARF "Add DWARF debugging information" ${IS_DEBUG_BUILD} "MINGW" OFF)
option(ENABLE_LTO "Enable link time optimization" ${DEFAULT_ENABLE_LTO})
@ -126,6 +128,15 @@ if (ENABLE_SDL2_FRONTEND)
add_definitions(-DENABLE_SDL2_FRONTEND)
endif()
if(ENABLE_SSE42 AND (CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64|AMD64"))
message(STATUS "SSE4.2 enabled for x86_64")
if(MSVC)
SET(SSE42_COMPILE_OPTION /arch:SSE4.2)
else()
SET(SSE42_COMPILE_OPTION -msse4.1 -msse4.2)
endif()
endif()
include(CitraHandleSystemLibs)
if (CITRA_USE_PRECOMPILED_HEADERS)