Fast square root function?

I heard the standard sqrt function from math.h demands a lot of resources. So I ask does anyone know a faster square root function? Currently, I am using a FastSqrt function from the source sdk which is used to calculate the distance from player origin to enemy origin.

Code:

static inline float FastSqrt(float x)
{
	__m128 root = _mm_sqrt_ss(_mm_load_ss(&x));
	return *(reinterpret_cast<float *>(&root));
}

Yes, I'm shit at maths and sorry for copy pasting.

Originally Posted by 4773n0x

I heard the standard sqrt function from math.h demands a lot of resources. So I ask does anyone know a faster square root function? Currently, I am using a FastSqrt function from the source sdk which is used to calculate the distance from player origin to enemy origin.

Code:

static inline float FastSqrt(float x)
{
	__m128 root = _mm_sqrt_ss(_mm_load_ss(&x));
	return *(reinterpret_cast<float *>(&root));
}

Yes, I'm shit at maths and sorry for copy pasting.

Write your own square root function, with minimal lib calls if possible. Just google it out.

Thanks for the answer, thread can be closed now! And sorry for this silly question.

/Solved & closed.

Fast square root function?

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