From e881004d7666f90665aa666d5fe97a45b04cebe8 Mon Sep 17 00:00:00 2001
From: Timo Heister <timo.heister@gmail.com>
Date: Wed, 25 Apr 2018 11:39:17 -0400
Subject: [PATCH] add optimization option

Introduce a new settings to allow native optimizations. This currently
affects PETSc and deal.II (basically setting march=native).
---
 candi.cfg                                 |  3 +++
 deal.II-toolchain/packages/dealii.package | 11 ++++++++++-
 deal.II-toolchain/packages/petsc.package  |  9 +++++++++
 3 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/candi.cfg b/candi.cfg
index e36fdd5..7eb2081 100644
--- a/candi.cfg
+++ b/candi.cfg
@@ -28,6 +28,9 @@ MIRROR="https://tjhei.info/candi-mirror/ https://cecas.clemson.edu/dealii/mirror
 #Choose configuration and components of deal.II
 DEAL_CONFOPTS=""
 
+# enable machine-specific optimizations (implies -march=native etc.)?
+#NATIVE_OPTIMIZATIONS=true
+
 PACKAGES="load:dealii-prepare"
 
 # These are system dependencies that are often pre-installed:
diff --git a/deal.II-toolchain/packages/dealii.package b/deal.II-toolchain/packages/dealii.package
index fe42bb7..c69b614 100644
--- a/deal.II-toolchain/packages/dealii.package
+++ b/deal.II-toolchain/packages/dealii.package
@@ -26,7 +26,16 @@ CONFOPTS=" \
 -D DEAL_II_FORCE_BUNDLED_UMFPACK:BOOL=OFF \
 -D DEAL_II_WITH_BOOST:BOOL=ON \
 -D DEAL_II_FORCE_BUNDLED_BOOST:BOOL=OFF \
--D DEAL_II_WITH_ZLIB:BOOL=ON \
+-D DEAL_II_WITH_ZLIB:BOOL=ON"
+
+if [ "${NATIVE_OPTIMIZATIONS}" = "true" ]; then
+    CONFOPTS="${CONFOPTS} \
+      -D CMAKE_CXX_FLAGS='-march=native'
+    "
+fi
+
+# add the user-specified flags at the end (so things can be overriden):
+CONFOPTS="${CONFOPTS} \
 ${DEAL_CONFOPTS}"
 
 
diff --git a/deal.II-toolchain/packages/petsc.package b/deal.II-toolchain/packages/petsc.package
index 0fab51f..0821a75 100644
--- a/deal.II-toolchain/packages/petsc.package
+++ b/deal.II-toolchain/packages/petsc.package
@@ -37,6 +37,15 @@ CONFOPTS="
   --with-64-bit-indices=0
 "
 
+if [ "${NATIVE_OPTIMIZATIONS}" = "true" ]; then
+    CONFOPTS="${CONFOPTS}
+      COPTFLAGS='-O3 -march=native -mtune=native'
+      CXXOPTFLAGS='-O3 -march=native -mtune=native'
+      FOPTFLAGS='-O3 -march=native -mtune=native'
+    "
+fi
+
+
 for external_pkg in hypre; do
     CONFOPTS="${CONFOPTS} --download-${external_pkg}=1"
 done
-- 
2.39.5