Texas Instruments TMS320C64X Programmer's Reference Manual page 92

DSP_maxidx
Implementation Notes
Benchmarks
4-64
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Bank Conflicts: No bank conflicts occur.
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Interruptibility: The code is interrupt-tolerant but not interruptible.
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The code is unrolled 16 times to enable the full bandwidth of LDDW and
MAX2 instructions to be utilized. This splits the search into 16 sub-ranges.
The global maximum is then found from the list of maximums of the
sub-ranges. Then, using this offset from the sub-ranges, the global
maximum and the index of it are found using a simple match. For common
maximums in multiple ranges, the index will be different to the above C
code.
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This code requires 40 bytes of stack space for a temporary buffer.
Cycles 5 * nx / 16 + 42
Codesize 388 bytes