L_msu

Multiply two 16-bit fractional values and subtract this product from a 32-bit fractional value, saturating if necessary. Generates a 32-bit result.

Assumptions

OMR's SA bit was set to 1 at least three cycles before this code, that is, saturation on data ALU results enabled.

Prototype


  Word32 L_msu(Word32 laccum, Word16 sinp1, Word16 sinp2)

Example

short s1 = 0xC000;/* - 0.5 */

short s2 = 0xC000;/* - 0.5 */

long result, Acc = 0;



result = L_msu(Acc,s1,s2);

// Expected value of result: 0.25