diff src/fftw-3.3.8/simd-support/avx.c @ 167:bd3cc4d1df30

Add FFTW 3.3.8 source, and a Linux build

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/fftw-3.3.8/simd-support/avx.c	Tue Nov 19 14:52:55 2019 +0000
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2003, 2007-14 Matteo Frigo
+ * Copyright (c) 2003, 2007-14 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 "kernel/ifftw.h"
+
+#if HAVE_AVX
+
+#if defined(__x86_64__) || defined(_M_X64) || defined(_M_AMD64)
+#    include "amd64-cpuid.h"
+#else
+#    include "x86-cpuid.h"
+#endif
+
+int X(have_simd_avx)(void)
+{
+     static int init = 0, res = 0;
+     int max_stdfn, eax, ebx, ecx, edx;
+
+     if (!init) {
+          cpuid_all(0,0,&eax,&ebx,&ecx,&edx);
+          max_stdfn = eax;
+          if (max_stdfn >= 0x1) {
+               /* have AVX and OSXSAVE? (implies XGETBV exists) */
+               cpuid_all(0x1, 0, &eax, &ebx, &ecx, &edx);
+               if ((ecx & 0x18000000) == 0x18000000) {
+                    /* have OS support for XMM, YMM? */
+                    res = ((xgetbv_eax(0) & 0x6) == 0x6);                    
+               }
+          }
+          init = 1;
+     }
+     return res;
+}
+
+#endif
+