shl

Arithmetic shift of 16-bit value by a specified shift amount. If the shift count is positive, a left shift is performed. Otherwise, a right shift is performed. 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 shlftNs or shlfts which are 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 shl(Word16 sval2shft, Word16 s_shftamount)

Example

short result;

short s1 = 0x1234;

short s2 = 1;



result = shl(s1,s2);

// Expected value of result: 0x2468