Texas Instruments TMS320C64X Manual do Utilizador descarregar pdf (Página 98)

DSP_recip16

4-70

*(rexp++)=normal−15; /* store exponent */

b=0x80000000; /* dividend = 1 */

for(j=15;j>0;j−−)

b=_subc(b,a); /* divide */

b=b&0x7FFF; /* clear remainder

/* (clear upper half) */

if(neg) b=−b; /* if originally

/* negative, negate */

*(rfrac++)=b; /* store fraction */

}

Special Requirements None

Implementation Notes

- Bank Conflicts: No bank conflicts occur.

- Interruptibility: The code is interruptible.

- The conditional subtract instruction, SUBC, is used for division. SUBC is

used once for every bit of quotient needed (15).

Benchmarks Cycles 8 * nx + 14

Codesize 196 bytes

1 2 ... 93 94 95 96 97 98 99 100 101 102 103 ... 168 169

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Texas Instruments TMS320C64X Manual do Utilizador Página 98