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float/double NAN/INF

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double float inf nan 

+0   0x00000000 0x0000000000000000
-0   0x80000000 0x8000000000000000
NAN  0x7fffffff 0x7fffffffffffffff
+INF 0x7f800000 0x7ff0000000000000
-INF 0xff800000 0xfff0000000000000