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Functional Description
The Compare-Select (
pairs of 16-bit operands, returns the largest values to the destination regis-
ter, and serially records in
performs signed operations. The operands are compared as
two's-complements.
Versions are available for dual and single 16-bit operations. Whereas the
dual versions compare four operands to return two maxima, the single ver-
sions compare only two operands to return one maximum.
The Accumulator extension bits (bits 39–32) must be cleared before exe-
cuting this instruction.
This operation is illustrated in
Table 19-4. Source Registers Contain
src_reg_0
src_reg_1
Table 19-5. Destination Register Contains
dest_reg
Dual 16-Bit Operand Behavior
The ASL version shifts
indicate the source of each maximum as shown in
Table
19-7.
ADSP-BF53x/BF56x Blackfin Processor Programming Reference
) instruction selects the maximum values of
VIT_MAX
the source of the maximum.This operation
A0.W
Table 19-4
31................24
23................16
y1
z1
31................24
23................16
Maximum, y1 or y0
left two bit positions and appends two LSBs to
A0
Vector Operations
and
Table
19-5.
15..................8
7....................0
y0
z0
15..................8
7....................0
Maximum, z1 or z0
Table 19-6
and
19-9
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