Motorola DSP56800 Guia do Utilizador descarregar pdf (Página 148)

100

101

Inline Assembly Language and Intrinsics

Intrinsic Functions

148

Targeting MC56F83xx/DSP5685x Controllers

Example

short s1 = 0x4000; /* 0.5 */

short s2 = 0x2000; /* 0.25 */

short result;

result = add(s1,s2);

// Expected value of result: 0x6000 = 0.75

sub

Subtraction of two 16-bit integer or fractional values, returning a 16-bit result.

Assumptions

OMR’s SA bit was set to 1 at least 3 cycles before this code, that is, saturation on data

ALU results enabled.

Prototype

Word16 sub(Word16 src_dst, Word16 src2)

Example

short s1 = 0x4000; /* 0.5 */

short s2 = 0xE000; /* -0.25 */

short result;

result = sub(s1,s2);

// Expected value of result: 0x6000 = 0.75

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