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The directives .set softfloat and .set hardfloat provide
finer control of disabling and enabling float-point instructions.
These directives always override the default (that hard-float
instructions are accepted) or the command-line options
(‘-msoft-float’ and ‘-mhard-float’).
The directives .set singlefloat and .set doublefloat
provide finer control of disabling and enabling double-precision
float-point operations. These directives always override the default
(that double-precision operations are accepted) or the command-line
options (‘-msingle-float’ and ‘-mdouble-float’).
Traditional MIPS assemblers do not support these directives.