comparison src/fftw-3.3.3/simd-support/sse2.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"
+
+#ifdef FFTW_SINGLE
+#  define DS(d,s) s /* single-precision option */
+#else
+#  define DS(d,s) d /* double-precision option */
+#endif
+
+#if HAVE_SSE2
+
+# if defined(__x86_64__) || defined(_M_X64) || defined(_M_AMD64)
+
+  int X(have_simd_sse2)(void)
+  {
+       return 1;
+  }
+
+# else /* !x86_64 */
+
+# include <signal.h>
+# include <setjmp.h>
+# include "x86-cpuid.h"
+
+  static jmp_buf jb;
+
+  static void sighandler(int x)
+  {
+       UNUSED(x);
+       longjmp(jb, 1);
+  }
+
+  static int sse2_works(void)
+  {
+       void (*oldsig)(int);
+       oldsig = signal(SIGILL, sighandler);
+       if (setjmp(jb)) {
+	    signal(SIGILL, oldsig);
+	    return 0;
+       } else {
+#         ifdef _MSC_VER
+	    _asm { DS(xorpd,xorps) xmm0,xmm0 }
+#         else
+	    /* asm volatile ("xorpd/s %xmm0, %xmm0"); */
+	    asm volatile(DS(".byte 0x66; .byte 0x0f; .byte 0x57; .byte 0xc0",
+			                ".byte 0x0f; .byte 0x57; .byte 0xc0"));
+#         endif
+	    signal(SIGILL, oldsig);
+	    return 1;
+       }
+  }
+
+  extern void X(check_alignment_of_sse2_pm)(void);
+
+  int X(have_simd_sse2)(void)
+  {
+       static int init = 0, res;
+
+       if (!init) {
+	    res =   !is_386() 
+		 && has_cpuid()
+		 && (cpuid_edx(1) & (1 << DS(26,25)))
+		 && sse2_works();
+	    init = 1;
+	    X(check_alignment_of_sse2_pm)();
+       }
+       return res;
+  }
+
+# endif
+
+#endif