# We assume X64 unless HH_POWER, HH_ARM, or HH_AARCH64 are defined.

override CPPFLAGS += -I.
override CXXFLAGS += -std=c++11 -Wall -O3 -fPIC -pthread
override LDFLAGS += -pthread

PREFIX ?= /usr/local
INCDIR ?= $(PREFIX)/include
LIBDIR ?= $(PREFIX)/lib

SIP_OBJS := $(addprefix obj/, \
	sip_hash.o \
	sip_tree_hash.o \
	scalar_sip_tree_hash.o \
)

DISPATCHER_OBJS := $(addprefix obj/, \
	arch_specific.o \
	instruction_sets.o \
	nanobenchmark.o \
	os_specific.o \
)

HIGHWAYHASH_OBJS := $(DISPATCHER_OBJS) obj/hh_portable.o
HIGHWAYHASH_TEST_OBJS := $(DISPATCHER_OBJS) obj/highwayhash_test_portable.o
VECTOR_TEST_OBJS := $(DISPATCHER_OBJS) obj/vector_test_portable.o

# aarch64 and ARM use the same code, although ARM usually needs an extra flag for NEON.
ifdef HH_ARM
CXXFLAGS += -mfloat-abi=hard -march=armv7-a -mfpu=neon
HH_AARCH64 = 1
endif

ifdef HH_AARCH64
HH_X64 =
HIGHWAYHASH_OBJS += obj/hh_neon.o
HIGHWAYHASH_TEST_OBJS += obj/highwayhash_test_neon.o
VECTOR_TEST_OBJS += obj/vector_test_neon.o
else
ifdef HH_POWER
HH_X64 =
HIGHWAYHASH_OBJS += obj/hh_vsx.o
HIGHWAYHASH_TEST_OBJS += obj/highwayhash_test_vsx.o
else
HH_X64 = 1
HIGHWAYHASH_OBJS += obj/hh_avx2.o obj/hh_sse41.o
HIGHWAYHASH_TEST_OBJS += obj/highwayhash_test_avx2.o obj/highwayhash_test_sse41.o
VECTOR_TEST_OBJS += obj/vector_test_avx2.o obj/vector_test_sse41.o
endif
endif

# In case highwayhash_test defines PRINT_RESULTS.
HIGHWAYHASH_TEST_OBJS += $(HIGHWAYHASH_OBJS)

all: $(addprefix bin/, \
	profiler_example nanobenchmark_example vector_test sip_hash_test \
	highwayhash_test benchmark) lib/libhighwayhash.a

obj/%.o: highwayhash/%.cc
	@mkdir -p -- $(dir $@)
	$(CXX) -c $(CPPFLAGS) $(CXXFLAGS) $< -o $@

bin/%: obj/%.o
	@mkdir -p -- $(dir $@)
	$(CXX) $(LDFLAGS) $^ -o $@

.DELETE_ON_ERROR:
deps.mk: $(wildcard highwayhash/*.cc) $(wildcard highwayhash/*.h) Makefile
	set -eu; for file in highwayhash/*.cc; do \
		target=obj/$${file##*/}; target=$${target%.*}.o; \
		[ "$$target" = "obj/highwayhash_target.o" ] || \
		[ "$$target" = "obj/data_parallel_benchmark.o" ] || \
		[ "$$target" = "obj/data_parallel_test.o" ] || \
		$(CXX) -c $(CPPFLAGS) $(CXXFLAGS) -DHH_DISABLE_TARGET_SPECIFIC -MM -MT \
		"$$target" "$$file"; \
	done | sed -e ':b' -e 's-../[^./]*/--' -e 'tb' >$@
-include deps.mk

bin/profiler_example: $(DISPATCHER_OBJS)

bin/nanobenchmark_example: $(DISPATCHER_OBJS) obj/nanobenchmark.o

ifdef HH_X64
# TODO: Portability: Have AVX2 be optional so benchmarking can be done on older machines.
obj/sip_tree_hash.o: CXXFLAGS+=-mavx2
# (Compiled from same source file with different compiler flags)
obj/highwayhash_test_avx2.o: CXXFLAGS+=-mavx2
obj/highwayhash_test_sse41.o: CXXFLAGS+=-msse4.1
obj/hh_avx2.o: CXXFLAGS+=-mavx2
obj/hh_sse41.o: CXXFLAGS+=-msse4.1
obj/vector_test_avx2.o: CXXFLAGS+=-mavx2
obj/vector_test_sse41.o: CXXFLAGS+=-msse4.1

obj/benchmark.o: CXXFLAGS+=-mavx2
endif

ifdef HH_POWER
obj/highwayhash_test_vsx.o: CXXFLAGS+=-mvsx
obj/hh_vsx.o: CXXFLAGS+=-mvsx
obj/benchmark.o: CXXFLAGS+=-mvsx
# Skip file - vector library/test not supported on PPC
obj/vector_test_target.o: CXXFLAGS+=-DHH_DISABLE_TARGET_SPECIFIC
obj/vector_test.o: CXXFLAGS+=-DHH_DISABLE_TARGET_SPECIFIC
endif

lib/libhighwayhash.a: $(SIP_OBJS) $(HIGHWAYHASH_OBJS) obj/c_bindings.o
	@mkdir -p -- $(dir $@)
	$(AR) rcs $@ $^
	# Disabled due to false positives; ideally the test instead ensures
	# target-specific modules _only_ export symbols starting with a prefix.
	# ./test_exports.sh $^

lib/libhighwayhash.so: $(SIP_OBJS) $(HIGHWAYHASH_OBJS) obj/c_bindings.o
	@mkdir -p -- $(dir $@)
	$(CXX) $(CXXFLAGS) $(LDFLAGS) -shared $^ -o $@.0 -Wl,-soname,libhighwayhash.so.0
	@cd $(dir $@); ln -s libhighwayhash.so.0 libhighwayhash.so

bin/highwayhash_test: $(HIGHWAYHASH_TEST_OBJS)

bin/benchmark: obj/benchmark.o $(HIGHWAYHASH_TEST_OBJS)
bin/benchmark: $(SIP_OBJS) $(HIGHWAYHASH_OBJS)
bin/vector_test: $(VECTOR_TEST_OBJS)

clean:
	[ ! -d obj ] || $(RM) -r -- obj/

distclean: clean
	[ ! -d bin ] || $(RM) -r -- bin/
	[ ! -d lib ] || $(RM) -r -- lib/

# Mode bits are from issue #58, thanks to yurivict for suggesting.
# Also added owner-write for stripping the .so in post-install.
install: lib/libhighwayhash.a lib/libhighwayhash.so
	mkdir -p $(DESTDIR)/$(LIBDIR)
	mkdir -p $(DESTDIR)/$(INCDIR)/highwayhash
	install -m0444 lib/libhighwayhash.a $(DESTDIR)/$(LIBDIR)
	install -m0755 lib/libhighwayhash.so $(DESTDIR)/$(LIBDIR)
	install -m0444 highwayhash/*.h $(DESTDIR)/$(INCDIR)/highwayhash/

post-install:
	${STRIP_CMD} $(DESTDIR)/$(LIBDIR)/libhighwayhash.so

.PHONY: clean distclean all install post-install