comparison src/fftw-3.3.3/simd-support/altivec.c @ 10:37bf6b4a2645

Add FFTW3

+/*
+ * Copyright (c) 2003, 2007-11 Matteo Frigo
+ * Copyright (c) 2003, 2007-11 Massachusetts Institute of Technology
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+
+#include "ifftw.h"
+
+#if HAVE_ALTIVEC
+
+#if HAVE_SYS_SYSCTL_H
+#  include <sys/sysctl.h>
+#endif
+
+#if HAVE_SYS_SYSCTL_H && HAVE_SYSCTL && defined(CTL_HW) && defined(HW_VECTORUNIT)
+/* code for darwin */
+static int really_have_altivec(void)
+{
+     int mib[2], altivecp;
+     size_t len;
+     mib[0] = CTL_HW;
+     mib[1] = HW_VECTORUNIT;
+     len = sizeof(altivecp);
+     sysctl(mib, 2, &altivecp, &len, NULL, 0);
+     return altivecp;
+} 
+#else /* GNU/Linux and other non-Darwin systems (!HAVE_SYS_SYSCTL_H etc.) */
+
+#include <signal.h>
+#include <setjmp.h>
+
+static jmp_buf jb;
+
+static void sighandler(int x)
+{
+     longjmp(jb, 1);
+}
+
+static int really_have_altivec(void)
+{
+     void (*oldsig)(int);
+     oldsig = signal(SIGILL, sighandler);
+     if (setjmp(jb)) {
+	  signal(SIGILL, oldsig);
+	  return 0;
+     } else {
+	  __asm__ __volatile__ (".long 0x10000484"); /* vor 0,0,0 */
+	  signal(SIGILL, oldsig);
+	  return 1;
+     }
+     return 0;
+}
+#endif
+
+int X(have_simd_altivec)(void)
+{
+     static int init = 0, res;
+     if (!init) {
+	  res = really_have_altivec();
+	  init = 1;
+     }
+     return res;
+}
+
+#endif