diff src/fftw-3.3.8/simd-support/avx512.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/avx512.c	Tue Nov 19 14:52:55 2019 +0000
@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2003, 2007-11 Matteo Frigo
+ * Copyright (c) 2003, 2007-11 Massachusetts Institute of Technology
+ * Copyright (c) 2012-2013 Romain Dolbeau
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ */
+
+#include "kernel/ifftw.h"
+
+#if HAVE_AVX512
+
+#if defined(__x86_64__) || defined(_M_X64) || defined(_M_AMD64)
+
+#include "amd64-cpuid.h"
+
+int X(have_simd_avx512)(void)
+{
+     static int init = 0, res;     
+     int max_stdfn, eax, ebx, ecx, edx;
+
+     /* NOTE: this code is a total guess.  I don't have an avx512
+        machine available.  The code contributed by Erik Lindahl would
+        crash on a machine without XGETBV, so I had to guess a fix. */
+     if (!init) {
+          cpuid_all(0,0,&eax,&ebx,&ecx,&edx);
+          max_stdfn = eax;
+          if (max_stdfn >= 0x1) {
+               /* have OSXSAVE? (implies XGETBV exists) */
+               cpuid_all(0x1, 0, &eax, &ebx, &ecx, &edx);
+               if ((ecx & 0x08000000) == 0x08000000) {
+                    /* have AVX512? */
+                    cpuid_all(7,0,&eax,&ebx,&ecx,&edx);
+                    if (ebx & (1 << 16)) {
+                         /* have OS support for XMM, YMM, ZMM */
+                         int zmm_ymm_xmm = (7 << 5) | (1 << 2) | (1 << 1);
+                         res = ((xgetbv_eax(0) & zmm_ymm_xmm) == zmm_ymm_xmm);
+                    }
+               }
+          }
+          init = 1;
+     }
+
+     return res;
+}
+
+#else /* 32-bit code */
+
+#error "Avx512 is 64 bits only"
+
+#endif
+
+#endif