loongarch: Refine build control for loongarch64.

1. Use getauxval instead of cpucfg to test hardware capability.
2. Remove unnecessary code and option for compiler check in c_check.

c_check

@@ -199,8 +199,7 @@ if [ "$architecture" = "loongarch64" ]; then
     tmpd="$(mktemp -d)"
     tmplsx="$tmpd/lsx.c"
     codelsx='"vadd.b $vr0, $vr0, $vr0"'
-    lsx_flags='-march=loongarch64 -mlsx'
-    printf "#include <lsxintrin.h>\n\n" >> "$tmplsx"
+    lsx_flags='-march=loongarch64'
     printf "void main(void){ __asm__ volatile(%s);}\n" "$codelsx" >> "$tmplsx"
     args="$lsx_flags -o $tmplsx.o $tmplsx"
     {
@@ -211,8 +210,7 @@ if [ "$architecture" = "loongarch64" ]; then
 
     tmplasx="$tmpd/lasx.c"
     codelasx='"xvadd.b $xr0, $xr0, $xr0"'
-    lasx_flags='-march=loongarch64 -mlasx'
-    printf "#include <lasxintrin.h>\n\n" >> "$tmplasx"
+    lasx_flags='-march=loongarch64'
     printf "void main(void){ __asm__ volatile(%s);}\n" "$codelasx" >> "$tmplasx"
     args="$lasx_flags -o $tmplasx.o $tmplasx"
     {

c_check.pl

@@ -241,8 +241,7 @@ if (($architecture eq "loongarch64")) {
     } else {
 	$tmplsx = new File::Temp( SUFFIX => '.c' , UNLINK => 1 );
 	$codelsx = '"vadd.b $vr0, $vr0, $vr0"';
-	$lsx_flags = "-march=loongarch64 -mlsx";
-	print $tmplsx "#include <lsxintrin.h>\n\n";
+	$lsx_flags = "-march=loongarch64";
 	print $tmplsx "void main(void){ __asm__ volatile($codelsx); }\n";
 
 	$args = "$lsx_flags -o $tmplsx.o $tmplsx";
@@ -257,8 +256,7 @@ if (($architecture eq "loongarch64")) {
 
 	$tmplasx = new File::Temp( SUFFIX => '.c' , UNLINK => 1 );
 	$codelasx = '"xvadd.b $xr0, $xr0, $xr0"';
-	$lasx_flags = "-march=loongarch64 -mlasx";
-	print $tmplasx "#include <lasxintrin.h>\n\n";
+	$lasx_flags = "-march=loongarch64";
 	print $tmplasx "void main(void){ __asm__ volatile($codelasx); }\n";
 
 	$args = "$lasx_flags -o $tmplasx.o $tmplasx";

cpuid_loongarch64.c

@@ -47,8 +47,8 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #define CPU_LOONGSON3R5    1
 #define CPU_LOONGSON2K1000 2
 
-#define LA_HWCAP_LSX    (1<<4)
-#define LA_HWCAP_LASX   (1<<5)
+#define LA_HWCAP_LSX    (1U << 4)
+#define LA_HWCAP_LASX   (1U << 5)
 
 static char *cpuname[] = {
   "LOONGSONGENERIC",
@@ -64,11 +64,11 @@ static char *cpuname_lower[] = {
 
 int detect(void) {
 #ifdef __linux
-  int flag  = (int)getauxval(AT_HWCAP);
+  int hwcap  = (int)getauxval(AT_HWCAP);
 
-  if (flag & LA_HWCAP_LASX)
+  if (hwcap & LA_HWCAP_LASX)
     return CPU_LOONGSON3R5;
-  else if (flag & LA_HWCAP_LSX)
+  else if (hwcap & LA_HWCAP_LSX)
     return CPU_LOONGSON2K1000;
   else
     return CPU_GENERIC;
@@ -94,7 +94,9 @@ void get_subdirname(void) {
 }
 
 void get_cpuconfig(void) {
+  uint32_t hwcaps = 0;
   int d = detect();
+
   switch (d) {
     case CPU_LOONGSON3R5:
       printf("#define LOONGSON3R5\n");
@@ -129,6 +131,10 @@ void get_cpuconfig(void) {
       printf("#define L2_ASSOCIATIVE 16\n");
     break;
   }
+
+  hwcaps = (uint32_t)getauxval( AT_HWCAP );
+  if (hwcaps & LA_HWCAP_LSX)      printf("#define HAVE_LSX\n");
+  if (hwcaps & LA_HWCAP_LASX)     printf("#define HAVE_LASX\n");
 }
 
 void get_libname(void){

driver/others/dynamic_loongarch64.c

@@ -25,6 +25,7 @@ OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
 USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *******************************************************************************/
 
+#include <sys/auxv.h>
 #include "common.h"
 
 extern gotoblas_t  gotoblas_LOONGSON3R5;
@@ -74,21 +75,15 @@ static gotoblas_t *force_coretype(char *coretype) {
   return NULL;
 }
 
-#define LASX_MASK       1<<7
-#define LSX_MASK        1<<6
-#define LOONGARCH_CFG2  0x02
+#define LA_HWCAP_LSX    (1U << 4)
+#define LA_HWCAP_LASX   (1U << 5)
 
 static gotoblas_t *get_coretype(void) {
-  int ret = 0;
-  __asm__ volatile (
-    "cpucfg %0, %1 \n\t"
-    : "+&r"(ret)
-    : "r"(LOONGARCH_CFG2)
-  );
-
-  if (ret & LASX_MASK)
+  int hwcap = (int)getauxval(AT_HWCAP);
+
+  if (hwcap & LA_HWCAP_LASX)
     return &gotoblas_LOONGSON3R5;
-  else if (ret & LSX_MASK)
+  else if (hwcap & LA_HWCAP_LSX)
     return &gotoblas_LOONGSON2K1000;
   else
     return &gotoblas_LOONGSONGENERIC;