More conditional execution

Makefile

@@ -7,7 +7,8 @@ CP=cp
 RM=rm
 SYS=posix
 OPTIMIZATION=-O3 -finline-functions -Winline
-VECTORIZE=-ftree-vectorize -march=native -mavx2 -mfpmath=sse -ftree-vectorizer-verbose=5
+VECTORIZE=-ftree-vectorize -march=native -mavx2 -mfpmath=sse
+DIAGNOSE=-fopt-info-vec-all
 CFLAGS=$(OPTIMIZATION) -c -Wall
 LDFLAGS=-L/usr/local/lib
 CPFLAGS=-rf
@@ -42,6 +43,10 @@ ifeq ($(AGRESSIVE),1)
   CFLAGS+=$(VECTORIZE)
 endif
 
+ifeq ($(DIAGNOSTICS),1)
+  CFLAGS+=$(DIAGNOSE)
+endif
+
 ifeq ($(EXTENSION),1)
   CFLAGS+=-DPCONVERT_EXTENSION -I/usr/local/include -I/usr/include/python$(PYTHON_VERSION) -I/usr/local/include/python$(PYTHON_VERSION) $(shell python-config --includes)
   LIBS+=-lpython