shr_r

Arithmetic shift of 16-bit value by a specified shift amount. If the shift count is positive, a right shift is performed. Otherwise, a left shift is performed. If a right shift is performed, then rounding performed on result. Saturation may occur during a left shift. When an accumulator is the destination, zeroes out the LSP portion.

Note: This operation is not optimal on the DSP56800E because of the saturation requirements and the bidirectional capability. See the intrinsic shrtNs which is more optimal.

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


  Word16 shr_r(Word16 s_val2shft, Word16 s_shftamount)

Example

short result;

short s1 = 0x2468;

short s2= 1;



result = shr(s1,s2);

// Expected value of result: 0x1234