Difference between revisions of "User:Hef/ispc on rpi2"
< User:Hef
Jump to navigation
Jump to search
Line 16: | Line 16: | ||
./alloy -b --version=3.5 | ./alloy -b --version=3.5 | ||
</syntaxHighlight> | </syntaxHighlight> | ||
+ | |||
+ | I should try adding <code>export CFLAGS="-march=armv7-a -mtune=cortex-a7 -mfpu=neon"</code> | ||
== first attempt == | == first attempt == |
Revision as of 05:08, 27 March 2015
setup
gcc 4.6 both won't compile latest llvm/clang and will generate an ICE on older versions of clang.
sudo apt-get install cmake gcc-4.8 g++-4.8 bison flex libncurses5-dev subversion
second attempt
export LLVM_HOME=~/projects/llvm_home
export ISPC_HOME=$PWD
export CC=/usr/bin/gcc-4.8
export CXX=/usr/bin/g++-4.8
./alloy -b --version=3.5
I should try adding export CFLAGS="-march=armv7-a -mtune=cortex-a7 -mfpu=neon"
first attempt
ninja
git clone git://github.com/martine/ninja.git
cd ninja
git checkout release
./configure.py --bootstrap
sudo cp ninja /usr/local/bin/ninja
clang
git clone http://llvm.org/git/llvm.git
cd llvm/tools
git clone http://llvm.org/git/clang.git
cd ../../..
mkdir llvm-build
cd llvm-build
cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_C_COMPILER=/usr/bin/gcc-4.8 -DCMAKE_CXX_COMPILER=/usr/bin/g++-4.8 ../llvm -G Ninja
ninja -j1
Ninja will take many hours to complete.
I didn't fully test the -j
(concurrent build) options to ninja. ninja defaults to 6 on the rpi2. You will run out of memory if you do this. Even if you create larger swap for the pi, swapping to an sd card is a really major performance hit and you will be better of using fewer cores.
self hosted clang
cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_C_COMPILER=/usr/local/bin/clang -DCMAKE_CXX_COMPILER=/usr/local/bin/clang++ ../llvm -G Ninja
ispc
make ARM_ENABLED=1 -j4