Texas Instruments TMS320C64X Programmer's Reference Manual page 120

DSP_bitrev_cplx
Special Requirements
Implementation Notes
Benchmarks
4-92
if (t){x[i3] = xj3;
x[j3] = xi3;}
}
}
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nx must be a power of 2.
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The array index[] is generated by the routine bitrev_index provided in the
directory 'support\fft'.
If nx ≤ 4K, you can use the char (8-bit) data type for the "index" variable.
-
This requires changing the LDH when loading index values in the
assembly routine to LDB. This further reduces the size of the Index Table
by half.
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Interruptibility: The code is interrupt-tolerant but not interruptible.
The performance of this function has not yet been characterized on the C64x+