Idiomatic Faster C N-Body Contribution - Eric Whitney

CONTRIBUTE SOURCE CODE

Idiomatic, Faster C N-Body - Eric J. Whitney

For fun I implemented a version using standard, idiomatic C99 with a few additional performance improvements. Speed of this version is about 7% faster than the fastest C benchmark that didn't use hand-coded or non-standard vector instructions (at the time of writing). Some more details are here.

Source Code File

Complete, tested, source-code is attached.

nbody.gcc-x.c [EDIT changed filename to -x for clarity]

Example Build & Test Command-Line

The same build command-line is used as per other C benchmarks. I used GCC:

gcc -pipe -Wall -O3 -fomit-frame-pointer -march=ivybridge -o nbody.gcc-x.gcc_run nbody.gcc-x.c -lm

Run as per other benchmarks:

./nbody.gcc-x.gcc_run 50000000

-0.169075164
-0.169068761