SRC=$(wildcard src/*.cpp)
INCLUDE =include
_HX_FEAT?= -DFIXED_ROW_SIZE=24

CXXFLAGS?= -pipe -O3 -march=native
CXXFLAGS+= -flto -felide-constructors -fgraphite -fno-strict-aliasing -fno-exceptions -fomit-frame-pointer -fmerge-all-constants -fmodulo-sched -funswitch-loops -fsplit-loops
CXXFLAGS+= -Wall -pedantic --std=gnu++20 $(addprefix -I,$(INCLUDE))
LDFLAGS?= -O3 -flto
LDFLAGS+= -lfmt

PROJ = hexview

OBJ = $(addprefix obj/,$(SRC:.cpp=.o))

### PGO target specific ###

# Number of times to run profiling
PGO_ITERATIONS = 512
# Size in kb of training files
PGO_DATASET_SIZE = $$(( 1024 * 4 ))

PGO_OBJ = $(addprefix profile/,$(SRC:.cpp=.o))
PROF_FLAGS = -fprofile-generate

###

.PHONY: all
all: | dirs $(PROJ)

dirs:
	@mkdir -p obj/src
	@mkdir -p profile/src

obj/%.o: %.cpp
	$(CXX) -c $< $(_HX_FEAT) $(CXXFLAGS) -o $@ $(LDFLAGS)

profile/%.o: %.cpp
	$(CXX) -c $< $(_HX_FEAT) $(CXXFLAGS) $(PROF_FLAGS) -o $@ $(LDFLAGS) $(PROF_FLAGS)

$(PROJ): $(OBJ)
	$(CXX) $^ $(CXXFLAGS) -o $@ $(LDFLAGS)
	strip $@

pgo-generate: $(PGO_OBJ)
	$(CXX) $^ $(CXXFLAGS) $(PROF_FLAGS) -o $@ $(LDFLAGS) $(PROF_FLAGS)

pgo-profile: pgo-generate
	for i in {1..$(PGO_ITERATIONS)}; do \
		dd if=/dev/urandom of=./pgo-test bs=1024 count=$(PGO_DATASET_SIZE) >> /dev/null 2>&1; \
		printf "\rIteration $$i / $(PGO_ITERATIONS)"; \
		./pgo-generate ./pgo-test > ./pgo-output; \
	done
	@echo ""
	rm ./pgo-test
	rm ./pgo-output
	rm pgo-generate


pgo-use: PROF_FLAGS = -fprofile-use -lgcov
pgo-use: $(PGO_OBJ)
	$(CXX) $^ $(CXXFLAGS) $(PROF_FLAGS) -o $@ $(LDFLAGS) $(PROF_FLAGS)

$(PROJ)-pgo: | dirs pgo-profile
	find ./profile -name \*.o -exec rm {} +
	$(MAKE) pgo-use
	mv pgo-use $@
	strip $@

clean:
	rm -f $(PROJ)
	rm -f $(PROJ)-pgo
	rm -rf obj
	rm -rf profile
	rm -f pgo-{test,output,generate}