From: Martin Kronbichler <kronbichler@lnm.mw.tum.de>
Date: Thu, 1 Feb 2018 10:23:01 +0000 (+0100)
Subject: Add macro for __restrict keyword.
X-Git-Tag: v9.0.0-rc1~488^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=41ae5cbc581cc91379223252ecf8248c703ea0ab;p=dealii.git

Add macro for __restrict keyword.
---

diff --git a/cmake/checks/check_01_compiler_features.cmake b/cmake/checks/check_01_compiler_features.cmake
index d22d786fec..479d274b3b 100644
--- a/cmake/checks/check_01_compiler_features.cmake
+++ b/cmake/checks/check_01_compiler_features.cmake
@@ -33,6 +33,7 @@
 #   DEAL_II_COMPILER_HAS_ATTRIBUTE_ALWAYS_INLINE
 #   DEAL_II_DEPRECATED
 #   DEAL_II_ALWAYS_INLINE
+#   DEAL_II_RESTRICT
 #   DEAL_II_COMPILER_HAS_DIAGNOSTIC_PRAGMA
 #   DEAL_II_COMPILER_HAS_FUSE_LD_GOLD
 #
@@ -363,6 +364,23 @@ ELSE()
   SET(DEAL_II_ALWAYS_INLINE " ")
 ENDIF()
 
+#
+# Check whether the compiler understands the __restrict keyword.
+#
+CHECK_CXX_SOURCE_COMPILES(
+  "
+          void fn (double *__restrict a, double *__restrict b) { a[0] = b[0]; a[1] = b[0]; }
+          int main() { }
+  "
+  DEAL_II_COMPILER_HAS_RESTRICT_KEYWORD
+  )
+
+IF(DEAL_II_COMPILER_HAS_RESTRICT_KEYWORD)
+  SET(DEAL_II_RESTRICT "__restrict")
+ELSE()
+  SET(DEAL_II_RESTRICT " ")
+ENDIF()
+
 
 #
 # GCC and Clang allow fine grained control of diagnostics via the "GCC
diff --git a/include/deal.II/base/config.h.in b/include/deal.II/base/config.h.in
index 89edbc5ae3..151371bdc4 100644
--- a/include/deal.II/base/config.h.in
+++ b/include/deal.II/base/config.h.in
@@ -93,6 +93,7 @@
 #cmakedefine __PRETTY_FUNCTION__ @__PRETTY_FUNCTION__@
 #cmakedefine DEAL_II_DEPRECATED @DEAL_II_DEPRECATED@
 #cmakedefine DEAL_II_ALWAYS_INLINE @DEAL_II_ALWAYS_INLINE@
+#cmakedefine DEAL_II_RESTRICT @DEAL_II_RESTRICT@
 #cmakedefine DEAL_II_COMPILER_HAS_DIAGNOSTIC_PRAGMA