Motorola DSP56800 Guía de usuario descargar pdf (Pagina 169)

100

101

Inline Assembly Language and Intrinsics

Intrinsic Functions

169Targeting MC56F83xx/DSP5685x Controllers

Example

short result;

short s1 = 0x1234;

short s2 = 1;

result = shl(s1,s2);

// Expected value of result: 0x2468

shlftNs

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 does

not occur during a left shift. When an accumulator is the destination, zeroes out the

LSP portion.

NOTE

Ignores upper N-5 bits of s_shftamount except the sign bit (MSB).

If s_shftamount is positive and the value in the lower 5 bits of

s_shftamount is greater than 15, the result is 0.

If s_shftamount is negative and the absolute value in the lower 5 bits

of s_shftamount is greater than 15, the result is 0 if sval2shft is

positive, and 0xFFFF if sval2shft is negative.

Prototype

Word16 shlftNs(Word16 sval2shft, Word16 s_shftamount)

1 2 ... 164 165 166 167 168 169 170 171 172 173 174 ... 445 446

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Motorola DSP56800 Guía de usuario Pagina 169

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