From: Timo Heister <timo.heister@gmail.com>
Date: Fri, 22 Nov 2013 14:34:38 +0000 (+0000)
Subject: disable vectorization on intel compilers because they produce wrong code. See issue... 
X-Git-Tag: v8.1.0~207
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7bc0e8e6fce8a9d58ed6d055ee122f877d80248c;p=dealii.git

disable vectorization on intel compilers because they produce wrong code. See issue 156.

git-svn-id: https://svn.dealii.org/trunk@31760 0785d39b-7218-0410-832d-ea1e28bc413d
---

diff --git a/deal.II/cmake/setup_compiler_flags_intel.cmake b/deal.II/cmake/setup_compiler_flags_intel.cmake
index d29abc6537..aabd08e7ff 100644
--- a/deal.II/cmake/setup_compiler_flags_intel.cmake
+++ b/deal.II/cmake/setup_compiler_flags_intel.cmake
@@ -128,6 +128,12 @@ IF (CMAKE_BUILD_TYPE MATCHES "Release")
   #
 
   ADD_FLAGS(DEAL_II_CXX_FLAGS_RELEASE "-O2")
+  # in intel (at least 13.1 and 14), vectorization causes
+  # wrong code. See https://code.google.com/p/dealii/issues/detail?id=156
+  # or tests/hp/solution_transfer.cc
+  # A work-around is to disable all vectorization.
+  ADD_FLAGS(DEAL_II_CXX_FLAGS_RELEASE "-no-vec")
+
 
   # equivalent to -fno-strict-aliasing:
   ENABLE_IF_SUPPORTED(DEAL_II_CXX_FLAGS_RELEASE "-no-ansi-alias")