33 lines
1.5 KiB
C
33 lines
1.5 KiB
C
#include "sn_intrinsic.h"
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#include "sn_internal.h"
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INTERNAL void SN_DECL f32_normalize(sn_vec_f32 *restrict source, sn_vec_f32 *restrict target)
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{
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register __m128 s = source->f32_x[0];
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register __m128 a_length_sq = _mm_mul_ps(s, s);
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a_length_sq = _mm_add_ps(a_length_sq,
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_mm_shuffle_ps(a_length_sq, a_length_sq, _MM_SHUFFLE(2, 3, 0, 1)));
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a_length_sq = _mm_add_ss(a_length_sq,
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_mm_shuffle_ps(a_length_sq, a_length_sq, _MM_SHUFFLE(0, 0, 3, 2)));
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__m128 a_inv_length = _mm_rsqrt_ps(a_length_sq);
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s = _mm_mul_ps(s, a_inv_length);
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__m128 dot_product = _mm_mul_ps(target->f32_x[0], s);
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dot_product = _mm_add_ps(dot_product,
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_mm_shuffle_ps(dot_product, dot_product, _MM_SHUFFLE(2, 3, 0, 1)));
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dot_product = _mm_add_ss(dot_product,
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_mm_shuffle_ps(dot_product, dot_product, _MM_SHUFFLE(0, 0, 3, 2)));
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__m128 b_orthogonal = _mm_sub_ps(target->f32_x[0], _mm_mul_ps(s, dot_product));
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__m128 b_length_sq = _mm_mul_ps(b_orthogonal, b_orthogonal);
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b_length_sq = _mm_add_ps(b_length_sq,
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_mm_shuffle_ps(b_length_sq, b_length_sq, _MM_SHUFFLE(2, 3, 0, 1)));
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b_length_sq = _mm_add_ss(b_length_sq,
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_mm_shuffle_ps(b_length_sq, b_length_sq, _MM_SHUFFLE(0, 0, 3, 2)));
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__m128 b_inv_length = _mm_rsqrt_ps(b_length_sq);
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target->f32_x[0] = _mm_mul_ps(b_orthogonal, b_inv_length);
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}
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