Texas Instruments TMS320C64X manual Intermediate results

DSP_mul32

e+=d;	/* Xhigh*Yhigh + */
	/* (Xhigh*Ylow+Xlow*Yhigh)>>16 */
*(r++)=e;

}

}

Special Requirements

-nx must be a multiple of 8 and greater than or equal to 16.

-Input and output vectors must be double-word aligned.

Implementation Notes

	- Bank Conflicts: No bank conflicts occur.
	- Interruptibility: The code is interrupt-tolerant but not interruptible.
	- The MPYHI instruction is used to perform 16 x 32 multiplies to form 48-bit
	intermediate results.
Benchmarks	Cycles	9 * nx/8 + 18
	Codesize	512 bytes

C64x+ DSPLIB Reference 4-67