Analog Devices ADSP-BF53x Blackfin, Reference

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Instruction Overview
19-32 ADSP-BF53x/BF56x Blackfin Processor Programming Reference
Vector MAX
General Form
dest_reg = MAX ( src_reg_0, src_reg_1 ) (V)
Syntax
Dreg = MAX ( Dreg , Dreg ) (V) ; /* dual 16-bit operations
(b) */
Syntax Terminology
Dreg
:
R7–0
Instruction Length
In the syntax, comment (b) identifies 32-bit instruction length.
Functional Description
The Vector Maximum instruction returns the maximum value (meaning
the largest positive value, nearest to 0x7FFF) of the 16-bit half-word
source registers to the
dest_reg
.
The instruction compares the upper half-words of
src_reg_0
and
src_reg_1
and returns that maximum to the upper half-word of
dest_reg
.
It also compares the lower half-words of
src_reg_0
and
src_reg_1
and
returns that maximum to the lower half-word of
dest_reg
. The result is a
concatenation of the two 16-bit maximum values.
The Vector Maximum instruction does not implicitly modify input val-
ues. The
dest_reg
can be the same D-register as one of the source
registers. Doing this explicitly modifies that source register.