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The floating point formats generated by directives are these.
.float
Single
precision (32-bit) floating point constants.
.double
If the -m64bit-doubles command-line option has been specified then then double
directive generates double
precision (64-bit) floating point constants, otherwise it generates single
precision (32-bit) floating point constants. To force the generation of 64-bit floating point constants used the dc.d
directive instead.