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20 ISSUING PARALLEL
INSTRUCTIONS
This chapter discusses the instructions that can be issued in parallel. It
identifies supported combinations for parallel issue, parallel issue syntax,
32-bit ALU/MAC instructions, 16-bit instructions, and examples.
The Blackfin processor is not superscalar; it does not execute multiple
instructions at once. However, it does permit up to three instructions to
be issued in parallel with some limitations. A multi-issue instruction is
64-bits in length and consists of one 32-bit instruction and two 16-bit
instructions. All three instructions execute in the same amount of time as
the slowest of the three.
Sections in this chapter
•
"Supported Parallel Combinations" on page 20-1
•
"Parallel Issue Syntax" on page 20-2
•
"32-Bit ALU/MAC Instructions" on page 20-3
•
"16-Bit Instructions" on page 20-6
•
"Examples" on page 20-8
Supported Parallel Combinations
The diagram in
that the Blackfin processor supports.
ADSP-BF53x/BF56x Blackfin Processor Programming Reference
Table 20-1
illustrates the combinations for parallel issue
20-1
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