misc.c: add a few basic clock functions

Makefile

@@ -89,10 +89,10 @@ CFLAGS    := -std=gnu11
 
 ### dev OR release
 # dev
-CFLAGS    += -O1
+#CFLAGS    += -O1
 #CFLAGS    += -g
 # release
-#CFLAGS    += -Ofast
+CFLAGS    += -Ofast
 
 CFLAGS    += -march=native
 CFLAGS    += -flto
@@ -100,7 +100,7 @@ CFLAGS    += -Wall
 CFLAGS    += -Wextra
 CFLAGS    += -Wmissing-declarations
 # for gprof
-CFLAGS += -pg
+#CFLAGS += -pg
 # Next one may be useful for valgrind (when invalid instructions)
 # CFLAGS += -mno-tbm
 
@@ -309,7 +309,7 @@ BB_OBJS       := $(FEN_OBJS)
 MOVEGEN_OBJS  := $(BB_OBJS) move.o move-gen.o
 ATTACK_OBJS   := $(MOVEGEN_OBJS)
 MOVEDO_OBJS   := $(ATTACK_OBJS) move-do.o
-PERFT_OBJS    := $(MOVEDO_OBJS) search.o
+PERFT_OBJS    := $(MOVEDO_OBJS) search.o misc.o
 
 TEST          := $(addprefix $(BINDIR)/,$(TEST))