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Home > Vector Floating Point Programming > VFP instructions > FABS, FCPY, and FNEG |
Floating-point copy, absolute value, and negate.
These instructions can be scalar, vector, or mixed (see Vector and scalar operations).
<op
><precision
>{cond
}Fd
,Fm
where:
<op
>
must be one of FCPY
, FABS
,
or FNEG
.
<precision
>
must be either S
for single-precision,
or D
for double-precision.
cond
is an optional condition code (see VFP and condition codes).
Fd
is the VFP register for the result.
Fm
is the VFP register holding the operand.
The precision of
and Fd
must
match the precision specified in Fm
<
.precision
>
The FCPY
instruction copies the contents of
into Fm
.Fd
The FABS
instruction takes the contents of
,
clears the sign bit, and places the result in Fm
.
This gives the absolute value.Fd
The FNEG
instruction takes the contents of
,
changes the sign bit, and places the result in Fm
.
This gives the negation of the value.Fd
If the operand is a NaN, the sign bit is determined in each case as above, but no exception is produced.