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Introduce better fix to fake 0.5 and 3.0 double constants

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Uses a new rel_sqrt_consts.h file
This commit is contained in:
gamemasterplc 2024-01-21 20:53:11 -06:00
parent fa82e1e788
commit c2506716d2
14 changed files with 70 additions and 76 deletions
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19
include/math.h
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@ -7,24 +7,6 @@
#define _MATH_INLINE static inline
#endif
#ifdef MATH_EXPORT_CONST
extern inline float sqrtf(float x)
{
static const double _half=.5;
static const double _three=3.0;
volatile float y;
if(x > 0.0f)
{
double guess = __frsqrte((double)x); // returns an approximation to
guess = _half*guess*(_three - guess*guess*x); // now have 12 sig bits
guess = _half*guess*(_three - guess*guess*x); // now have 24 sig bits
guess = _half*guess*(_three - guess*guess*x); // now have 32 sig bits
y=(float)(x*guess);
return y;
}
return x;
}
#else
extern inline float sqrtf(float x)
{
volatile float y;
@ -39,7 +21,6 @@ extern inline float sqrtf(float x)
}
return x;
}
#endif
double atan(double x);
double copysign(double x, double y);

8
include/rel_sqrt_consts.h Normal file
View file

@ -0,0 +1,8 @@
#ifndef _REL_SQRT_CONSTS
#define _REL_SQRT_CONSTS
const double __fakeHalf = 0.5;
const double __fakeThree = 3.0;
#endif