AutoResearchMathExp.h File Reference

Detailed Description

On-device accuracy and speed of fl::exp against the toolchain libm (#4288).

fl::exp is a range-reduced polynomial with no libm dependency. This bench answers two questions on the real core: how far it is from the toolchain's expf/exp in ulp, and how many nanoseconds a call costs next to libm's. Host x86 numbers are not representative (glibc's expf uses FMA and tables); RISC-V and Cortex-M are what this is for.

libm is used only as the reference, from AutoResearchMathExp.cpp, so this header pulls in no math library.

Definition in file AutoResearchMathExp.h.

#include "fl/math/math.h"
#include "fl/stl/int.h"
#include "fl/system/sketch_macros.h"

Include dependency graph for AutoResearchMathExp.h:

Go to the source code of this file.

Classes
struct	autoresearch::math_exp::Result

Namespaces
namespace	autoresearch
namespace	autoresearch::math_exp

Functions
Result	autoresearch::math_exp::run (fl::u32 iterations)
	Runs the accuracy sweep and the timed loops. iterations = calls per loop.

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Class Documentation

autoresearch::math_exp::Result

struct autoresearch::math_exp::Result

Class Members
u32	accuracy_points
u32	fl_exp_us
u32	fl_expf_us
u32	iterations
int	large_memory
u32	libm_exp_us
u32	libm_expf_us
float	sink
bool	success
double	worst_ulp_double
float	worst_ulp_float
double	worst_x_double
float	worst_x_float