Various OpenCL benchmarks

Matthias Vogelgesang 39103aeaa8 Initial commit 8 lat temu
Makefile 39103aeaa8 Initial commit 8 lat temu
c.mk 39103aeaa8 Initial commit 8 lat temu
ocl.c 39103aeaa8 Initial commit 8 lat temu
ocl.h 39103aeaa8 Initial commit 8 lat temu
perf.c 39103aeaa8 Initial commit 8 lat temu