Fl Pt works.

The only failure I can get in the test suite is that signalling nan'n
crash it, which is expected behavior anyway.

Enables sse3 and fast-math.

Makefile

@@ -57,7 +57,7 @@ endif
 INCLUDE=include
 MDEFINES=-DU2_OS_$(OS) -DU2_OS_ENDIAN_$(ENDIAN) -D U2_LIB=\"$(LIB)\" 
 
-CFLAGS= -O2 -g \
+CFLAGS= -O2 -g -msse3 -ffast-math \
 	-funsigned-char \
 	-I/usr/local/include \
 	-I/opt/local/include \

v/main.c

@@ -18,6 +18,7 @@
 #include <termios.h>
 #include <term.h>
 #include <dirent.h>
+#include <pmmintrin.h>
 #include <xmmintrin.h>
 
 #define U2_GLOBAL
@@ -250,6 +251,7 @@ main(c3_i   argc,
   c3_w kno_w;
 
   _MM_SET_FLUSH_ZERO_MODE(_MM_FLUSH_ZERO_ON);
+  _MM_SET_DENORMALS_ZERO_MODE(_MM_DENORMALS_ZERO_ON);
 
   //  Parse options.
   //