<avr/builtins.h>: avr-gcc builtins documentation

Functions
void	__builtin_avr_sei (void)
void	__builtin_avr_cli (void)
void	__builtin_avr_sleep (void)
void	__builtin_avr_wdr (void)
uint8_t	__builtin_avr_swap (uint8_t __b)
uint16_t	__builtin_avr_fmul (uint8_t __a, uint8_t __b)
int16_t	__builtin_avr_fmuls (int8_t __a, int8_t __b)
int16_t	__builtin_avr_fmulsu (int8_t __a, uint8_t __b)
float	__builtin_powif (float base, int expo)
double	__builtin_powi (double base, int expo)
long double	__builtin_powil (long double base, int expo)

Detailed Description

#include <avr/builtins.h> 

Note

This file only documents some avr-gcc builtins. For functions built-in in the compiler, there should be no prototype declarations.

See also the GCC documentation for a full list of avr-gcc builtins.

Function Documentation

__builtin_avr_cli()

void __builtin_avr_cli

(

void

)

Disables all interrupts by clearing the global interrupt mask.

__builtin_avr_fmul()

uint16_t __builtin_avr_fmul	(	uint8_t	__a,
		uint8_t	__b
	)

Emits an FMUL (fractional multiply unsigned) instruction.

__builtin_avr_fmuls()

int16_t __builtin_avr_fmuls	(	int8_t	__a,
		int8_t	__b
	)

Emits an FMUL (fractional multiply signed) instruction.

__builtin_avr_fmulsu()

int16_t __builtin_avr_fmulsu	(	int8_t	__a,
		uint8_t	__b
	)

Emits an FMUL (fractional multiply signed with unsigned) instruction.

__builtin_avr_sei()

void __builtin_avr_sei

(

void

)

Enables interrupts by setting the global interrupt mask.

__builtin_avr_sleep()

void __builtin_avr_sleep

(

void

)

Emits a SLEEP instruction.

__builtin_avr_swap()

uint8_t __builtin_avr_swap

(

uint8_t

__b

)

Emits a SWAP (nibble swap) instruction on __b.

__builtin_avr_wdr()

void __builtin_avr_wdr

(

void

)

Emits a WDR (watchdog reset) instruction.

__builtin_powi()

double __builtin_powi	(	double	base,
		int	expo
	)

Returns base raised to the power of expo. Since avr-gcc v15 this function is implemented in assembly.

__builtin_powif()

float __builtin_powif	(	float	base,
		int	expo
	)

Returns base raised to the power of expo. Since avr-gcc v15 this function is implemented in assembly. See also the benchmarks.

__builtin_powil()

long double __builtin_powil	(	long double	base,
		int	expo
	)

Returns base raised to the power of expo. Since avr-gcc v15 this function is implemented in assembly. See also the benchmarks.