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checkasm: add float comparison util functions

This commit is contained in:
Janne Grunau 2015-12-07 16:14:46 +01:00
parent 711781d7a1
commit 9d218d573f
2 changed files with 84 additions and 0 deletions
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73
tests/checkasm/checkasm.c
View File

@ -27,6 +27,7 @@
#include "checkasm.h"
#include "libavutil/common.h"
#include "libavutil/cpu.h"
#include "libavutil/intfloat.h"
#include "libavutil/random_seed.h"
#if HAVE_IO_H
@ -151,6 +152,78 @@ static struct {
/* PRNG state */
AVLFG checkasm_lfg;
/* float compare support code */
static int is_negative(union av_intfloat32 u)
{
return u.i >> 31;
}
int float_near_ulp(float a, float b, unsigned max_ulp)
{
union av_intfloat32 x, y;
x.f = a;
y.f = b;
if (is_negative(x) != is_negative(y)) {
// handle -0.0 == +0.0
return a == b;
}
if (abs(x.i - y.i) <= max_ulp)
return 1;
return 0;
}
int float_near_ulp_array(const float *a, const float *b, unsigned max_ulp,
unsigned len)
{
unsigned i;
for (i = 0; i < len; i++) {
if (!float_near_ulp(a[i], b[i], max_ulp))
return 0;
}
return 1;
}
int float_near_abs_eps(float a, float b, float eps)
{
float abs_diff = fabsf(a - b);
return abs_diff < eps;
}
int float_near_abs_eps_array(const float *a, const float *b, float eps,
unsigned len)
{
unsigned i;
for (i = 0; i < len; i++) {
if (!float_near_abs_eps(a[i], b[i], eps))
return 0;
}
return 1;
}
int float_near_abs_eps_ulp(float a, float b, float eps, unsigned max_ulp)
{
return float_near_ulp(a, b, max_ulp) || float_near_abs_eps(a, b, eps);
}
int float_near_abs_eps_array_ulp(const float *a, const float *b, float eps,
unsigned max_ulp, unsigned len)
{
unsigned i;
for (i = 0; i < len; i++) {
if (!float_near_abs_eps_ulp(a[i], b[i], eps, max_ulp))
return 0;
}
return 1;
}
/* Print colored text to stderr if the terminal supports it */
static void color_printf(int color, const char *fmt, ...)
{

11
tests/checkasm/checkasm.h
View File

@ -42,6 +42,17 @@ void checkasm_fail_func(const char *msg, ...) av_printf_format(1, 2);
void checkasm_update_bench(int iterations, uint64_t cycles);
void checkasm_report(const char *name, ...) av_printf_format(1, 2);
/* float compare utilities */
int float_near_ulp(float a, float b, unsigned max_ulp);
int float_near_abs_eps(float a, float b, float eps);
int float_near_abs_eps_ulp(float a, float b, float eps, unsigned max_ulp);
int float_near_ulp_array(const float *a, const float *b, unsigned max_ulp,
unsigned len);
int float_near_abs_eps_array(const float *a, const float *b, float eps,
unsigned len);
int float_near_abs_eps_array_ulp(const float *a, const float *b, float eps,
unsigned max_ulp, unsigned len);
extern AVLFG checkasm_lfg;
#define rnd() av_lfg_get(&checkasm_lfg)