I went ahead and created a Makefile: CXXFLAGS := -g -std=c++11 -Wall -O3 -march=native -Wno-sign-compare OBJS := highway_tree_hash.o \ scalar_highway_tr

I went ahead and created a Makefile: CXXFLAGS := -g -std=c++11 -Wall -O3 -march=native -Wno-sign-compare OBJS := highway_tree_hash.o \ scalar_highway_tree_hash.o \ scalar_sip_tree_hash.o \ sip_hash.o \ sip_tree_hash.o MAIN := sip_hash_main all: $(OBJS) $(CXX) $(CXXFLAGS) $(OBJS) $(MAIN).cc -o $(MAIN) clean: rm -f $(OBJS) $(MAIN) Then I commented out two lines in "sip_hash_main.cc": // #include "smhasher.h" // RunAllTests(argc, argv); Then "make" and run: nate@skylake:~/git/highwayhash$ ./sip_hash_main ScalarSipTreeHash ... GBps=2.44 c/b=1.44 ScalarHighwayTreeHash ... GBps=1.16 c/b=3.02 SipHash ... GBps=1.54 c/b=2.27 SipTreeHash ... GBps=4.56 c/b=0.77 HighwayTreeHash ... GBps=11.49 c/b=0.30 ... The inner loop for HighwayTreeHash looks like this: 0.89 │ 60:┌─→vpor %ymm5,%ymm0,%ymm0 4.47 │ │ vpaddq (%rcx),%ymm1,%ymm1 6.04 │ │ add $0x4,%rax 0.22 │ │ add $0x20,%rcx 2.24 │ │ cmp %rax,%rdi 3.13 │ │ vpsrlq $0x20,%ymm1,%ymm2 3.36 │ │ vpmulu %ymm1,%ymm0,%ymm4 13.20 │ │ vpshuf %ymm3,%ymm4,%ymm4 11.19 │ │ vpmulu %ymm2,%ymm0,%ymm2 │ │ vpaddq %ymm1,%ymm2,%ymm1 31.32 │ │ vpaddq %ymm4,%ymm0,%ymm0 7.61 │ └──ja 60