Floating-Point Constants

I'm confused about the hexadecimal format for entering floating-point constants. The bit pattern for 1.0 as a single-precision float is 0x3f800000. I tried entering the constant as 'float 0x3f800000', but the assembler said the constant was invalid for the type. The bit pattern for 1.0 as a double-precision float is 0x3ff0000000000000, so I entered the constant as 'float 0x3ff0000000000000', and it worked.
Is this the correct behavior?

Best Regards,
Jon

Yes, it is.