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34 lines
1.1 KiB
34 lines
1.1 KiB
/* |
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inline __m128 _mm_rsqrt_nr_ss(__m128 const x) |
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{ |
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__m128 recip = _mm_rsqrt_ss( x ); // "estimate" opcode |
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const static __m128 three = { 3, 3, 3, 3 }; // aligned consts for fast load |
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const static __m128 half = { 0.5,0.5,0.5,0.5 }; |
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__m128 halfrecip = _mm_mul_ss( half, recip ); |
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__m128 threeminus_xrr = _mm_sub_ss( three, _mm_mul_ss( x, _mm_mul_ss ( recip, recip ) ) ); |
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return _mm_mul_ss( halfrecip, threeminus_xrr ); |
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} |
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inline __m128 __mm_normalize_fast_ps( float * RESTRICT vOut, float * RESTRICT vIn ) |
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{ |
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__m128 x = _mm_load_ss(&vIn[0]); |
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__m128 y = _mm_load_ss(&vIn[1]); |
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__m128 z = _mm_load_ss(&vIn[2]); |
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const __m128 l = // compute x*x + y*y + z*z |
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_mm_add_ss( |
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_mm_add_ss( _mm_mul_ss(x,x), |
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_mm_mul_ss(y,y) |
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), |
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_mm_mul_ss( z, z ) |
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); |
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const __m128 rsqt = _mm_rsqrt_nr_ss( l ); |
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_mm_store_ss( &vOut[0] , _mm_mul_ss( rsqt, x ) ); |
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_mm_store_ss( &vOut[1] , _mm_mul_ss( rsqt, y ) ); |
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_mm_store_ss( &vOut[2] , _mm_mul_ss( rsqt, z ) ); |
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return _mm_mul_ss( l , rsqt ); |
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} |
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*/ |