Motorola DSP56800 Betriebsanweisung PDF herunterladen (Seite 177)

100

101

Inline Assembly Language and Intrinsics

Intrinsic Functions

177Targeting MC56F83xx/DSP5685x Controllers

Example

long l1 = 0x41111111;

short s2 = 1;

long result;

result = L_shr_r(l1,s2);

// Expected value of result: 0x20888889

L_shrtNs

Arithmetic shift of 32-bit value by a specified shift amount.If the shift count is

positive, a right shift is performed. Otherwise, a left shift is performed. Saturation does

not occur during a left shift.

NOTE

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

Prototype

Word32 L_shrtNs(Word32 lval2shft, Word16 s_shftamount)

Example

long result, l = 0x24680000;

short s2= 1;

result = L_shrtNs(l,s2);

// Expected value of result: 0x12340000

Modulo Addressing Intrinsic Functions

A modulo buffer is a buffer in which the data pointer loops back to the beginning of

the buffer once the pointer address value exceeds a specified limit.

Figure 7.1

depicts a modulo buffer with the limit six. Increasing the pointer address

value to 0x106 makes it point to the same data it would point to if its address value

were 0x100.

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