cmake: By default optimize for current arch

Note: it requires GCC 4.7. Otherwise use -DDISABLE_ADVANCE_SIMD=OFF to restore
previous behavior. It will impact Ubuntu precise (12.04)

build.sh

@@ -37,6 +37,7 @@ for ARG in "$@"; do
         --wx28        ) flags+=(-DWX28_API=TRUE) ;;
         --wx30        ) flags+=(-DWX28_API=FALSE) ;;
         --64-bit-dont-work ) flags+=(-D64BIT_BUILD_DONT_WORK=TRUE) ;;
+        --no-simd    )  flags+=(-DDISABLE_ADVANCE_SIMD=TRUE) ;;
 
         *)
             # Unknown option
@@ -58,6 +59,7 @@ for ARG in "$@"; do
             echo "--gles          : Replace openGL backend of GSdx by openGLES3"
             echo
             echo "--64-bit-dont-work : Don't use it!"
+            echo "--no-simd       : Only allow sse2"
             exit 1
     esac
 done

cmake/BuildParameters.cmake

@@ -64,6 +64,7 @@ option(USE_ASAN "Enable address sanitizer")
 # Select the architecture
 #-------------------------------------------------------------------------------
 option(64BIT_BUILD_DONT_WORK "Enable a x86_64 build instead of cross compiling (WARNING: NOTHING WORK)" OFF)
+option(DISABLE_ADVANCE_SIMD "Disable advance use of SIMD (SSE2+ & AVX)" OFF)
 
 # Architecture bitness detection
 if(CMAKE_SIZEOF_VOID_P EQUAL 8)
@@ -99,7 +100,11 @@ if(_ARCH_64 AND 64BIT_BUILD_DONT_WORK)
     # x86_64 requires -fPIC
     set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 
-    set(ARCH_FLAG "-m64 -msse -msse2")
+    if (DISABLE_ADVANCE_SIMD)
+        set(ARCH_FLAG "-m64 -msse -msse2")
+    else()
+        set(ARCH_FLAG "-m64 -march=native -fabi-version=6")
+    endif()
     add_definitions(-D_ARCH_64=1 -D_M_X86=1 -D_M_X86_64=1)
     set(_ARCH_64 1)
     set(_M_X86 1)
@@ -127,7 +132,13 @@ else()
     #     - Only plugins. No package will link to them.
     set(CMAKE_POSITION_INDEPENDENT_CODE OFF)
 
-    set(ARCH_FLAG "-m32 -msse -msse2 -march=i686")
+    if (DISABLE_ADVANCE_SIMD)
+        set(ARCH_FLAG "-m32 -msse -msse2 -march=i686")
+    else()
+        # AVX requires some fix of the ABI (mangling) (default 2)
+        # Note: V6 requires GCC 4.7
+        set(ARCH_FLAG "-m32 -march=native -fabi-version=6")
+    endif()
     add_definitions(-D_ARCH_32=1 -D_M_X86=1 -D_M_X86_32=1)
     set(_ARCH_32 1)
     set(_M_X86 1)

plugins/GSdx/CMakeLists.txt

@@ -92,6 +92,7 @@ set(GSdxSources
     GSDrawScanline.cpp
     GSDrawScanlineCodeGenerator.cpp
     GSDrawScanlineCodeGenerator.x86.avx.cpp
+    GSDrawScanlineCodeGenerator.x86.avx2.cpp
     GSDrawScanlineCodeGenerator.x64.cpp
     GSDrawScanlineCodeGenerator.x86.cpp
     GSDrawScanlineCodeGenerator.x64.avx.cpp
@@ -109,6 +110,7 @@ set(GSdxSources
     GSSetting.cpp
     GSSetupPrimCodeGenerator.cpp
     GSSetupPrimCodeGenerator.x86.avx.cpp
+    GSSetupPrimCodeGenerator.x86.avx2.cpp
     GSSetupPrimCodeGenerator.x64.avx.cpp
     GSSetupPrimCodeGenerator.x86.cpp
     GSSetupPrimCodeGenerator.x64.cpp