Analog Devices ADSP-BF53x Blackfin Reference page 539

Exponents are unsigned integers. The Exponent Detection instruction
accommodates the two special cases (0 and –1) and always returns the
smallest exponent for each case.
The reference exponent and destination exponent are 16-bit half-word
unsigned values. The sample number can be either a word or half-word.
The Exponent Detection instruction does not implicitly modify input val-
ues. The
dest_reg
Doing this explicitly modifies the
The valid range of exponents is 0 through 31, with 31 representing the
smallest 32-bit number magnitude and 15 representing the smallest 16-bit
number magnitude.
Exponent Detection supports three types of samples—one 32-bit sample,
one 16-bit sample (either upper-half or lower-half word), and two 16-bit
samples that occupy the upper-half and lower-half words of a single 32-bit
register.
Flags Affected
None
The ADSP-BF535 processor has fewer
operate differently than subsequent Blackfin family products. For
more information on the ADSP-BF535 status flags, see
on page
Required Mode
User & Supervisor
Parallel Issue
This instruction can be issued in parallel with specific other 16-bit
instructions. For details, see
ADSP-BF53x/BF56x Blackfin Processor Programming Reference
and
exponent_register
A-3.
"Issuing Parallel Instructions" on page
Arithmetic Operations
can be the same D-register.
exponent_register
ASTAT
.
flags and some flags
Table A-1
20-1.
15-27