From 215c6b19f7c2980447212ccd2e5d491fc937d4c8 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Fri, 17 Aug 2007 06:41:20 +0000
Subject: [PATCH] Enabled SSE2 intrinsics

---
 VisualC/SDL/SDL.vcproj |  4 ++--
 configure.in           | 26 ++++++++++++++++++++++++++
 2 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/VisualC/SDL/SDL.vcproj b/VisualC/SDL/SDL.vcproj
index 1b0e9d1c6..8797ec595 100644
--- a/VisualC/SDL/SDL.vcproj
+++ b/VisualC/SDL/SDL.vcproj
@@ -47,7 +47,7 @@
 				Name="VCCLCompilerTool"
 				Optimization="0"
 				AdditionalIncludeDirectories="..\..\include"
-				PreprocessorDefinitions="_DEBUG;_WINDOWS;_WIN32_WINNT=0x0400;__MMX__;__3dNOW__;__SSE__"
+				PreprocessorDefinitions="_DEBUG;_WINDOWS;_WIN32_WINNT=0x0400;__MMX__;__3dNOW__;__SSE__;__SSE2__"
 				RuntimeLibrary="2"
 				BufferSecurityCheck="false"
 				UsePrecompiledHeader="0"
@@ -145,7 +145,7 @@
 				InlineFunctionExpansion="1"
 				EnableIntrinsicFunctions="false"
 				AdditionalIncludeDirectories="..\..\include"
-				PreprocessorDefinitions="NDEBUG;_WINDOWS;_WIN32_WINNT=0x0400;__MMX__;__3dNOW__;__SSE__"
+				PreprocessorDefinitions="NDEBUG;_WINDOWS;_WIN32_WINNT=0x0400;__MMX__;__3dNOW__;__SSE__;__SSE2__"
 				StringPooling="true"
 				RuntimeLibrary="2"
 				BufferSecurityCheck="false"
diff --git a/configure.in b/configure.in
index 262beee9c..bb40c729d 100644
--- a/configure.in
+++ b/configure.in
@@ -356,6 +356,32 @@ AC_HELP_STRING([--enable-sse], [use SSE assembly routines [[default=yes]]]),
         fi
     fi
 
+    AC_ARG_ENABLE(sse2,
+AC_HELP_STRING([--enable-sse2], [use SSE2 assembly routines [[default=yes]]]),
+                  , enable_sse2=yes)
+    if test x$enable_sse2 = xyes; then
+        save_CFLAGS="$CFLAGS"
+        have_gcc_sse2=no
+        AC_MSG_CHECKING(for GCC -msse2 option)
+        sse2_CFLAGS="-msse2"
+        CFLAGS="$save_CFLAGS $sse2_CFLAGS"
+
+        AC_TRY_COMPILE([
+        #include <emmintrin.h>
+        #ifndef __SSE2__
+        #error Assembler CPP flag not enabled
+        #endif
+        ],[
+        ],[
+        have_gcc_sse2=yes
+        ])
+        AC_MSG_RESULT($have_gcc_sse2)
+
+        if test x$have_gcc_sse2 = xyes; then
+            EXTRA_CFLAGS="$EXTRA_CFLAGS $sse2_CFLAGS"
+        fi
+    fi
+
     AC_ARG_ENABLE(altivec,
 AC_HELP_STRING([--enable-altivec], [use Altivec assembly routines [[default=yes]]]),
                   , enable_altivec=yes)