build system: disable 3dNow! support by default

Closes: https://github.com/libsdl-org/SDL/issues/11472.
(cherry picked from commit 51570d92571f5f2be89d63036b793332606e1f64)

CMakeLists.txt

@@ -409,7 +409,7 @@ dep_option(SDL_SSE                 "Use SSE assembly routines" ON "SDL_ASSEMBLY;
 dep_option(SDL_SSE2                "Use SSE2 assembly routines" ON "SDL_ASSEMBLY;SDL_CPU_X86 OR SDL_CPU_X64" OFF)
 dep_option(SDL_SSE3                "Use SSE3 assembly routines" ON "SDL_ASSEMBLY;SDL_CPU_X86 OR SDL_CPU_X64" OFF)
 dep_option(SDL_MMX                 "Use MMX assembly routines" ON "SDL_ASSEMBLY;SDL_CPU_X86 OR SDL_CPU_X64" OFF)
-dep_option(SDL_3DNOW               "Use 3Dnow! MMX assembly routines" ON "SDL_ASSEMBLY;SDL_CPU_X86 OR SDL_CPU_X64" OFF)
+dep_option(SDL_3DNOW               "Use 3Dnow! MMX assembly routines" OFF "SDL_ASSEMBLY;SDL_CPU_X86 OR SDL_CPU_X64" OFF)
 dep_option(SDL_ALTIVEC             "Use Altivec assembly routines" ON "SDL_ASSEMBLY" OFF)
 dep_option(SDL_ARMSIMD             "Use SIMD assembly blitters on ARM" OFF "SDL_ASSEMBLY;SDL_CPU_ARM32" OFF)
 dep_option(SDL_ARMNEON             "Use NEON assembly blitters on ARM" OFF "SDL_ASSEMBLY;SDL_CPU_ARM32" OFF)

configure

@@ -1668,7 +1668,7 @@ Optional Features:
   --enable-ssemath        Allow GCC to use SSE floating point math
                           [default=maybe]
   --enable-mmx            use MMX assembly routines [default=yes]
-  --enable-3dnow          use 3DNow! assembly routines [default=yes]
+  --enable-3dnow          use 3DNow! assembly routines [default=no]
   --enable-sse            use SSE assembly routines [default=yes]
   --enable-sse2           use SSE2 assembly routines [default=maybe]
   --enable-sse3           use SSE3 assembly routines [default=maybe]
@@ -20647,7 +20647,7 @@ if test ${enable_3dnow+y}
 then :
   enableval=$enable_3dnow;
 else $as_nop
-  enable_3dnow=yes
+  enable_3dnow=no
 fi
 
     if test x$enable_3dnow = xyes; then
@@ -21036,7 +21036,7 @@ printf "%s\n" "#define HAVE_ALTIVEC_H 1" >>confdefs.h
     fi
 fi
 
-    # Check whether --enable-lsx was given.
+# Check whether --enable-lsx was given.
 if test ${enable_lsx+y}
 then :
   enableval=$enable_lsx;
@@ -21044,20 +21044,20 @@ else $as_nop
   enable_lsx=yes
 fi
 
-    if test x$enable_lsx = xyes; then
-        save_CFLAGS="$CFLAGS"
-        have_gcc_lsx=no
-        { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for GCC -mlsx option" >&5
+if test x$enable_lsx = xyes; then
+    save_CFLAGS="$CFLAGS"
+    have_gcc_lsx=no
+    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for GCC -mlsx option" >&5
 printf %s "checking for GCC -mlsx option... " >&6; }
-        lsx_CFLAGS="-mlsx"
-        CFLAGS="$save_CFLAGS $lsx_CFLAGS"
+    lsx_CFLAGS="-mlsx"
+    CFLAGS="$save_CFLAGS $lsx_CFLAGS"
 
-        cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+    cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
-        #ifndef __loongarch_sx
-        #error Assembler CPP flag not enabled
-        #endif
+    #ifndef __loongarch_sx
+    #error Assembler CPP flag not enabled
+    #endif
 
 int
 main (void)
@@ -21072,19 +21072,19 @@ then :
   have_gcc_lsx=yes
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
-        { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $have_gcc_lsx" >&5
+    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $have_gcc_lsx" >&5
 printf "%s\n" "$have_gcc_lsx" >&6; }
-        CFLAGS="$save_CFLAGS"
+    CFLAGS="$save_CFLAGS"
 
-        if test x$have_gcc_lsx = xyes; then
-            EXTRA_CFLAGS="$EXTRA_CFLAGS $lsx_CFLAGS"
-            SUMMARY_math="${SUMMARY_math} lsx"
-        fi
+    if test x$have_gcc_lsx = xyes; then
+       EXTRA_CFLAGS="$EXTRA_CFLAGS $lsx_CFLAGS"
+       SUMMARY_math="${SUMMARY_math} lsx"
     fi
+fi
 
-    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for lsxintrin.h" >&5
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for lsxintrin.h" >&5
 printf %s "checking for lsxintrin.h... " >&6; }
-    cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #include <lsxintrin.h>
 int
@@ -21102,13 +21102,13 @@ else $as_nop
   have_lsxintrin_h_hdr=no
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
-    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $have_lsxintrin_h_hdr" >&5
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $have_lsxintrin_h_hdr" >&5
 printf "%s\n" "$have_lsxintrin_h_hdr" >&6; }
-    if test x$have_lsxintrin_h_hdr = xyes; then
+if test x$have_lsxintrin_h_hdr = xyes; then
 
 printf "%s\n" "#define HAVE_LSXINTRIN_H 1" >>confdefs.h
 
-    fi
+fi
 
 CheckOSS()
 {

configure.ac

@@ -698,8 +698,8 @@ dnl Check for various instruction support
     fi
 
     AC_ARG_ENABLE(3dnow,
-[AS_HELP_STRING([--enable-3dnow], [use 3DNow! assembly routines [default=yes]])],
-                  , enable_3dnow=yes)
+[AS_HELP_STRING([--enable-3dnow], [use 3DNow! assembly routines [default=no]])],
+                  , enable_3dnow=no)
     if test x$enable_3dnow = xyes; then
         save_CFLAGS="$CFLAGS"
         have_gcc_3dnow=no
@@ -906,37 +906,37 @@ dnl Check for various instruction support
     fi
 fi
 
-    AC_ARG_ENABLE(lsx,
+AC_ARG_ENABLE(lsx,
 [AS_HELP_STRING([--enable-lsx], [use LSX assembly routines [default=yes]])],
                   , enable_lsx=yes)
-    if test x$enable_lsx = xyes; then
-        save_CFLAGS="$CFLAGS"
-        have_gcc_lsx=no
-        AC_MSG_CHECKING(for GCC -mlsx option)
-        lsx_CFLAGS="-mlsx"
-        CFLAGS="$save_CFLAGS $lsx_CFLAGS"
+if test x$enable_lsx = xyes; then
+    save_CFLAGS="$CFLAGS"
+    have_gcc_lsx=no
+    AC_MSG_CHECKING(for GCC -mlsx option)
+    lsx_CFLAGS="-mlsx"
+    CFLAGS="$save_CFLAGS $lsx_CFLAGS"
 
-        AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
-        #ifndef __loongarch_sx
-        #error Assembler CPP flag not enabled
-        #endif
-        ]], [])], [have_gcc_lsx=yes], [])
-        AC_MSG_RESULT($have_gcc_lsx)
-        CFLAGS="$save_CFLAGS"
+    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+    #ifndef __loongarch_sx
+    #error Assembler CPP flag not enabled
+    #endif
+    ]], [])], [have_gcc_lsx=yes], [])
+    AC_MSG_RESULT($have_gcc_lsx)
+    CFLAGS="$save_CFLAGS"
 
-        if test x$have_gcc_lsx = xyes; then
-            EXTRA_CFLAGS="$EXTRA_CFLAGS $lsx_CFLAGS"
-            SUMMARY_math="${SUMMARY_math} lsx"
-        fi
+    if test x$have_gcc_lsx = xyes; then
+       EXTRA_CFLAGS="$EXTRA_CFLAGS $lsx_CFLAGS"
+       SUMMARY_math="${SUMMARY_math} lsx"
     fi
+fi
 
-    AC_MSG_CHECKING(for lsxintrin.h)
-    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <lsxintrin.h>]])],
-       [have_lsxintrin_h_hdr=yes],[have_lsxintrin_h_hdr=no])
-    AC_MSG_RESULT($have_lsxintrin_h_hdr)
-    if test x$have_lsxintrin_h_hdr = xyes; then
-        AC_DEFINE(HAVE_LSXINTRIN_H, 1, [ ])
-    fi
+AC_MSG_CHECKING(for lsxintrin.h)
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <lsxintrin.h>]])],
+   [have_lsxintrin_h_hdr=yes],[have_lsxintrin_h_hdr=no])
+AC_MSG_RESULT($have_lsxintrin_h_hdr)
+if test x$have_lsxintrin_h_hdr = xyes; then
+   AC_DEFINE(HAVE_LSXINTRIN_H, 1, [ ])
+fi
 
 dnl See if the OSS audio interface is supported
 CheckOSS()

include/SDL_cpuinfo.h

@@ -53,9 +53,11 @@ _m_prefetch(void *__P)
 #ifndef __MMX__
 #define __MMX__
 #endif
+/*
 #ifndef __3dNOW__
 #define __3dNOW__
 #endif
+*/
 #endif
 #ifndef __SSE__
 #define __SSE__