Motorola DSP56800 Podręcznik Użytkownika Pobierz pdf (Strona 146)

100

101

Inline Assembly Language and Intrinsics

Intrinsic Functions

146

Targeting MC56F83xx/DSP5685x Controllers

Prototype

Word16 negate(Word16 svar1)

Example

int result, s1 = 0xE000; /* - 0.25 */

result = negate(s1);

// Expected value of result: 0x2000 = 0.25

L_abs

Absolute value of a 32-bit integer or fractional value returning a 32-bit result. Returns

0x7FFFFFFF for an input of 0x80000000.

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

Word32 L_abs(Word32 lvar1)

Example

long result, l = 0xE0000000; /* - 0.25 */

result = L_abs(s1);

// Expected value of result: 0x20000000 = 0.25

L_negate

Negates a 32-bit integer or fractional value returning a 32-bit result. Returns

0x7FFFFFFF for an input of 0x80000000.

Assumptions

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

ALU results enabled.

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Motorola DSP56800 Podręcznik Użytkownika Strona 146

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