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FLOATING-POINT INSTRUCTIONS·
6.3.2 Floating-Point Multiply Low
fmlow.dd fsret, fsre2, fdest
(Floating-Point Multiply Low)
fdest
~
low-order 53 bits of (fsret mantissa x fsre2 mantissa)
fdest bit 53
~
most significant bit of (fsret mantissa x fsre2 mantissa)
The
fmlow
instruction multiplies the low-order bits of its operands.
It
operates only on
double-precision operands. The high-order 10 bits of the result are undefined.
An
fmlow
can perform 32-bit integer multiplies. Two 64-bit values are formed, with the
integers in the low-order 32 bits. The low-order 32-bits of the result are the same as the
low-order 32 bits of an integer mUltiply. The
fmlow
instruction does not update the
result-status bits of
fsr
and does not cause source- or result-exception traps.
6-8
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