From: Martin Kronbichler <kronbichler@lnm.mw.tum.de>
Date: Thu, 1 Dec 2016 17:49:02 +0000 (+0100)
Subject: Fix DEAL_II_COMPILER_USE_VECTOR_ARITHMETICS with AVX512 and Intel.
X-Git-Tag: v8.5.0-rc1~350^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F3653%2Fhead;p=dealii.git

Fix DEAL_II_COMPILER_USE_VECTOR_ARITHMETICS with AVX512 and Intel.
---

diff --git a/cmake/checks/check_01_compiler_features.cmake b/cmake/checks/check_01_compiler_features.cmake
index 62f6e0d866..15d2e25ce5 100644
--- a/cmake/checks/check_01_compiler_features.cmake
+++ b/cmake/checks/check_01_compiler_features.cmake
@@ -51,6 +51,9 @@
 CHECK_CXX_SOURCE_COMPILES(
   "
   #include <emmintrin.h>
+#ifdef __AVX512F__
+  #include <immintrin.h>
+#endif
   int main()
   {
     __m128d a, b;
@@ -60,6 +63,16 @@ CHECK_CXX_SOURCE_COMPILES(
     __m128d d = b - c;
     __m128d e = c * a + d;
     __m128d f = e/a;
+#ifdef __AVX512F__
+    __m512d g, h;
+    g = _mm512_set1_pd (1.0);
+    h = _mm512_set1_pd (2.1);
+    __m512d i = g + h;
+    g = i - g;
+    h *= i;
+    i = h/i;
+    (void)i;
+#endif
     (void)f;
   }
   "