diff --git a/Makefile b/Makefile
index 1d33a57..765f4d4 100644
--- a/Makefile
+++ b/Makefile
@@ -1,10 +1,22 @@
 CC := gcc
 CFLAGS := -O3 -march=native -mtune=native -flto -fomit-frame-pointer -DNDEBUG -Wall -Wextra -std=c11 -D_GNU_SOURCE -D_POSIX_C_SOURCE=200809L
 LDFLAGS := -pthread -lcrypto -lm -flto
+PGO_DIR := .pgo
 
-COMMON_OBJS := config.o utils.o json.o rpc.o types.o block_builder.o miner.o mining_loop.o
+SHA256_BACKEND_OBJS := sha256/sha256_backend.o
+HAS_ARM_CRYPTO := $(shell echo | $(CC) $(CFLAGS) -dM -E - 2>/dev/null | grep -c __ARM_FEATURE_CRYPTO)
+ifeq ($(shell uname -m),aarch64)
+ifneq ($(HAS_ARM_CRYPTO),0)
+SHA256_BACKEND_OBJS += sha256/sha256d80_4way_aarch64.o
+endif
+endif
 
-.PHONY: all clean
+COMMON_OBJS := config.o utils.o json.o rpc.o types.o block_builder.o miner.o mining_loop.o $(SHA256_BACKEND_OBJS)
+BENCH_BIN := bench_hash
+TEST_SHA_BIN := test_sha256_backend
+TEST_MINER_BIN := test_miner_regression
+
+.PHONY: all clean bench bench-5x test pgo-gen pgo-use pgo-clean
 
 all: miner launcher
 
@@ -18,4 +30,39 @@ launcher: launcher.o $(COMMON_OBJS)
 	$(CC) $(CFLAGS) -c $< -o $@
 
 clean:
-	rm -f *.o miner launcher
+	rm -f *.o sha256/*.o bench/*.o tests/*.o miner launcher $(BENCH_BIN) $(TEST_SHA_BIN) $(TEST_MINER_BIN)
+
+bench: $(BENCH_BIN)
+
+$(BENCH_BIN): bench/bench_hash.o $(SHA256_BACKEND_OBJS)
+	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
+
+bench-5x: $(BENCH_BIN)
+	@i=1; while [ $$i -le 5 ]; do \
+		echo "Run $$i/5"; \
+		./$(BENCH_BIN) 60; \
+		i=$$((i+1)); \
+	done
+
+$(TEST_SHA_BIN): tests/test_sha256_backend.o $(SHA256_BACKEND_OBJS) utils.o
+	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
+
+$(TEST_MINER_BIN): tests/test_miner_regression.o miner.o $(SHA256_BACKEND_OBJS) utils.o
+	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
+
+test: $(TEST_SHA_BIN) $(TEST_MINER_BIN)
+	./$(TEST_SHA_BIN)
+	./$(TEST_MINER_BIN)
+
+pgo-gen: CFLAGS += -fprofile-generate=$(PGO_DIR)
+pgo-gen: LDFLAGS += -fprofile-generate=$(PGO_DIR)
+pgo-gen: clean all
+	@echo "Profilazione build pronta."
+	@echo "Esegui il tuo workload manualmente, poi lancia: make pgo-use"
+
+pgo-use: CFLAGS += -fprofile-use=$(PGO_DIR) -fprofile-correction
+pgo-use: LDFLAGS += -fprofile-use=$(PGO_DIR)
+pgo-use: clean all
+
+pgo-clean:
+	rm -rf $(PGO_DIR)