Add loongarch support

LSX and LASX are enabled by default if compiler supports them.

configure.ac

@@ -852,6 +852,70 @@ dnl Check for various instruction support
     fi
 fi
 
+    AC_ARG_ENABLE(lsx,
+[AC_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 $lsx_CFLAGS"
+
+        AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+        #ifndef __loongarch_sx
+        #error Assembler CPP flag not enabled
+        #endif
+        ]], [])], [have_gcc_lsx=yes], [])
+        AC_MSG_RESULT($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
+    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_ARG_ENABLE(lasx,
+[AC_HELP_STRING([--enable-lasx], [use LASX assembly routines [default=yes]])],
+                  , enable_LASX=yes)
+    if test x$enable_LASX = xyes; then
+        save_CFLAGS="$CFLAGS"
+        have_gcc_lasx=no
+        AC_MSG_CHECKING(for GCC -mlasx option)
+        lasx_CFLAGS="-mlasx"
+        CFLAGS="$save_CFLAGS $lasx_CFLAGS"
+
+        AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+        #ifndef __loongarch_asx
+        #error Assembler CPP flag not enabled
+        #endif
+        ]], [])], [have_gcc_lasx=yes], [])
+        AC_MSG_RESULT($have_gcc_lasx)
+        CFLAGS="$save_CFLAGS"
+
+        if test x$have_gcc_lasx = xyes; then
+            EXTRA_CFLAGS="$EXTRA_CFLAGS $lasx_CFLAGS"
+            SUMMARY_math="${SUMMARY_math} lasx"
+        fi
+    fi
+
+    AC_MSG_CHECKING(for lasxintrin.h)
+    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <lasxintrin.h>]])],
+       [have_lasxintrin_h_hdr=yes],[have_lasxintrin_h_hdr=no])
+    AC_MSG_RESULT($have_lasxintrin_h_hdr)
+    if test x$have_lasxintrin_h_hdr = xyes; then
+        AC_DEFINE(HAVE_LASXINTRIN_H, 1, [ ])
+    fi
+
 dnl See if the OSS audio interface is supported
 CheckOSS()
 {