diff options
Diffstat (limited to 'indra/llmath/llvector4a.inl')
| -rw-r--r-- | indra/llmath/llvector4a.inl | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/indra/llmath/llvector4a.inl b/indra/llmath/llvector4a.inl index 36dbec078c..17e7de6eeb 100644 --- a/indra/llmath/llvector4a.inl +++ b/indra/llmath/llvector4a.inl @@ -335,8 +335,13 @@ inline void LLVector4a::normalize3() LLVector4a lenSqrd; lenSqrd.setAllDot3( *this, *this ); // rsqrt = approximate reciprocal square (i.e., { ~1/len(a)^2, ~1/len(a)^2, ~1/len(a)^2, ~1/len(a)^2 } const LLQuad rsqrt = _mm_rsqrt_ps(lenSqrd.mQ); +#if _M_ARM64 + static const LLQuad half = {.n128_f32 = {0.5f, 0.5f, 0.5f, 0.5f}}; + static const LLQuad three = {.n128_f32 = {3.f, 3.f, 3.f, 3.f }}; +#else static const LLQuad half = { 0.5f, 0.5f, 0.5f, 0.5f }; static const LLQuad three = {3.f, 3.f, 3.f, 3.f }; +#endif // Now we do one round of Newton-Raphson approximation to get full accuracy // According to the Newton-Raphson method, given a first 'w' for the root of f(x) = 1/x^2 - a (i.e., x = 1/sqrt(a)) // the next better approximation w[i+1] = w - f(w)/f'(w) = w - (1/w^2 - a)/(-2*w^(-3)) @@ -359,8 +364,13 @@ inline void LLVector4a::normalize4() LLVector4a lenSqrd; lenSqrd.setAllDot4( *this, *this ); // rsqrt = approximate reciprocal square (i.e., { ~1/len(a)^2, ~1/len(a)^2, ~1/len(a)^2, ~1/len(a)^2 } const LLQuad rsqrt = _mm_rsqrt_ps(lenSqrd.mQ); +#if _M_ARM64 + static const LLQuad half = {.n128_f32 = {0.5f, 0.5f, 0.5f, 0.5f}}; + static const LLQuad three = {.n128_f32 = {3.f, 3.f, 3.f, 3.f}}; +#else static const LLQuad half = { 0.5f, 0.5f, 0.5f, 0.5f }; static const LLQuad three = {3.f, 3.f, 3.f, 3.f }; +#endif // Now we do one round of Newton-Raphson approximation to get full accuracy // According to the Newton-Raphson method, given a first 'w' for the root of f(x) = 1/x^2 - a (i.e., x = 1/sqrt(a)) // the next better approximation w[i+1] = w - f(w)/f'(w) = w - (1/w^2 - a)/(-2*w^(-3)) @@ -383,8 +393,13 @@ inline LLSimdScalar LLVector4a::normalize3withLength() LLVector4a lenSqrd; lenSqrd.setAllDot3( *this, *this ); // rsqrt = approximate reciprocal square (i.e., { ~1/len(a)^2, ~1/len(a)^2, ~1/len(a)^2, ~1/len(a)^2 } const LLQuad rsqrt = _mm_rsqrt_ps(lenSqrd.mQ); +#if _M_ARM64 + static const LLQuad half = {.n128_f32 = {0.5f, 0.5f, 0.5f, 0.5f}}; + static const LLQuad three = {.n128_f32 = {3.f, 3.f, 3.f, 3.f}}; +#else static const LLQuad half = { 0.5f, 0.5f, 0.5f, 0.5f }; static const LLQuad three = {3.f, 3.f, 3.f, 3.f }; +#endif // Now we do one round of Newton-Raphson approximation to get full accuracy // According to the Newton-Raphson method, given a first 'w' for the root of f(x) = 1/x^2 - a (i.e., x = 1/sqrt(a)) // the next better approximation w[i+1] = w - f(w)/f'(w) = w - (1/w^2 - a)/(-2*w^(-3)) |