L_shl

Arithmetic shift of 32-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 L_shlftNs or L_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


  Word32 L_shl(Word32 lval2shft, Word16 s_shftamount)

Example

long result, l = 0x12345678;

short s2 = 1;



result = L_shl(l,s2);

// Expected value of result: 0x2468ACF0