Denormal prevention. More...

Classes
struct	ac< double >
	Add sine component at nyquist frequency (double specialization). More...

struct	ac< float >
	Add sine component at nyquist frequency (float specialization). More...

struct	dc< double >
	Add DC signal (double specialization). More...

struct	dc< float >
	Add DC signal (float specialization). More...

struct	none
	Disable denormal prevention. More...

struct	quantization< double >
	Quantize denormal numbers (double specialization). More...

struct	quantization< float >
	Quantize denormal numbers (float specialization). More...

struct	set_zero_1
	Detect denormals and set 0. More...

struct	set_zero_2
	Detect denormals and set 0. More...

struct	set_zero_3
	Detect denormals and set 0. More...

Functions
void	ftz_on ()
	Set Flush-To-Zero (FTZ). More...

void	ftz_off ()
	Unset Flush-To-Zero (FTZ). More...

void	daz_on ()
	Set Denormals-Are-Zero (DAZ). More...

void	daz_off ()
	Unset Denormals-Are-Zero (DAZ). More...

Detailed Description

Denormal prevention.

See also: Laurent de Soras, "Denormal numbers in floating point signal processing applications": http://ldesoras.free.fr/doc/articles/denormal-en.pdf

Function Documentation

◆ ftz_on()

void apf::dp::ftz_on ( )

inline

Set Flush-To-Zero (FTZ).

Note: requires SSE support

Definition at line 197 of file denormalprevention.h.

◆ ftz_off()

void apf::dp::ftz_off ( )

inline

Unset Flush-To-Zero (FTZ).

Note: requires SSE support

Definition at line 204 of file denormalprevention.h.

◆ daz_on()

void apf::dp::daz_on ( )

Set Denormals-Are-Zero (DAZ).

Note: requires SSE3 support

From http://softpixel.com/~cwright/programming/simd/sse.php:

DAZ wasn't available in the first version of SSE. Since setting a reserved bit in MXCSR causes a general protection fault, we need to be able to check the availability of this feature without causing problems. To do this, one needs to set up a 512-byte area of memory to save the SSE state to, using fxsave, and then one needs to inspect bytes 28 through 31 for the MXCSR_MASK value. If bit 6 is set, DAZ is supported, otherwise, it isn't.

Definition at line 221 of file denormalprevention.h.

◆ daz_off()

void apf::dp::daz_off ( )

Unset Denormals-Are-Zero (DAZ).

Note: requires SSE3 support

Definition at line 228 of file denormalprevention.h.

Classes