ARMNeon.h

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// Jolt Physics Library (https://github.com/jrouwe/JoltPhysics)
// SPDX-FileCopyrightText: 2022 Jorrit Rouwe
// SPDX-License-Identifier: MIT
 
#pragma once
 
#ifdef JPH_USE_NEON
 
#ifdef JPH_COMPILER_MSVC
    JPH_NAMESPACE_BEGIN
 
    // Constructing NEON values
    #define JPH_NEON_INT32x4(v1, v2, v3, v4) { int64_t(v1) + (int64_t(v2) << 32), int64_t(v3) + (int64_t(v4) << 32) }
    #define JPH_NEON_UINT32x4(v1, v2, v3, v4) { uint64_t(v1) + (uint64_t(v2) << 32), uint64_t(v3) + (uint64_t(v4) << 32) }
    #define JPH_NEON_INT8x16(v1, v2, v3, v4, v5, v6, v7, v8, v9, v10, v11, v12, v13, v14, v15, v16) { int64_t(v1) + (int64_t(v2) << 8) + (int64_t(v3) << 16) + (int64_t(v4) << 24) + (int64_t(v5) << 32) + (int64_t(v6) << 40) + (int64_t(v7) << 48) + (int64_t(v8) << 56), int64_t(v9) + (int64_t(v10) << 8) + (int64_t(v11) << 16) + (int64_t(v12) << 24) + (int64_t(v13) << 32) + (int64_t(v14) << 40) + (int64_t(v15) << 48) + (int64_t(v16) << 56) }
 
    // Generic shuffle vector template
    template <unsigned I1, unsigned I2, unsigned I3, unsigned I4>
    JPH_INLINE float32x4_t NeonShuffleFloat32x4(float32x4_t inV1, float32x4_t inV2)
    {
        float32x4_t ret;
        ret = vmovq_n_f32(vgetq_lane_f32(I1 >= 4? inV2 : inV1, I1 & 0b11));
        ret = vsetq_lane_f32(vgetq_lane_f32(I2 >= 4? inV2 : inV1, I2 & 0b11), ret, 1);
        ret = vsetq_lane_f32(vgetq_lane_f32(I3 >= 4? inV2 : inV1, I3 & 0b11), ret, 2);
        ret = vsetq_lane_f32(vgetq_lane_f32(I4 >= 4? inV2 : inV1, I4 & 0b11), ret, 3);
        return ret;
    }
 
    // Specializations
    template <>
    JPH_INLINE float32x4_t NeonShuffleFloat32x4<0, 1, 2, 2>(float32x4_t inV1, float32x4_t inV2)
    {
        return vcombine_f32(vget_low_f32(inV1), vdup_lane_s32(vget_high_f32(inV1), 0));
    }
 
    template <>
    JPH_INLINE float32x4_t NeonShuffleFloat32x4<0, 1, 3, 3>(float32x4_t inV1, float32x4_t inV2)
    {
        return vcombine_f32(vget_low_f32(inV1), vdup_lane_s32(vget_high_f32(inV1), 1));
    }
 
    template <>
    JPH_INLINE float32x4_t NeonShuffleFloat32x4<0, 1, 2, 3>(float32x4_t inV1, float32x4_t inV2)
    {
        return inV1;
    }
 
    template <>
    JPH_INLINE float32x4_t NeonShuffleFloat32x4<1, 0, 3, 2>(float32x4_t inV1, float32x4_t inV2)
    {
        return vcombine_f32(vrev64_f32(vget_low_f32(inV1)), vrev64_f32(vget_high_f32(inV1)));
    }
 
    template <>
    JPH_INLINE float32x4_t NeonShuffleFloat32x4<2, 2, 1, 0>(float32x4_t inV1, float32x4_t inV2)
    {
        return vcombine_f32(vdup_lane_s32(vget_high_f32(inV1), 0), vrev64_f32(vget_low_f32(inV1)));
    }
 
    template <>
    JPH_INLINE float32x4_t NeonShuffleFloat32x4<2, 3, 0, 1>(float32x4_t inV1, float32x4_t inV2)
    {
        return vcombine_f32(vget_high_f32(inV1), vget_low_f32(inV1));
    }
 
    // Used extensively by cross product
    template <>
    JPH_INLINE float32x4_t NeonShuffleFloat32x4<1, 2, 0, 0>(float32x4_t inV1, float32x4_t inV2)
    {
        static int8x16_t table = JPH_NEON_INT8x16(0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x00, 0x01, 0x02, 0x03, 0x00, 0x01, 0x02, 0x03);
        return vreinterpretq_f32_u8(vqtbl1q_u8(vreinterpretq_u8_f32(inV1), table));
    }
 
    // Shuffle a vector
    #define JPH_NEON_SHUFFLE_F32x4(vec1, vec2, index1, index2, index3, index4) NeonShuffleFloat32x4<index1, index2, index3, index4>(vec1, vec2)
 
    JPH_NAMESPACE_END
#else
    // Constructing NEON values
    #define JPH_NEON_INT32x4(v1, v2, v3, v4) { v1, v2, v3, v4 }
    #define JPH_NEON_UINT32x4(v1, v2, v3, v4) { v1, v2, v3, v4 }
    #define JPH_NEON_INT8x16(v1, v2, v3, v4, v5, v6, v7, v8, v9, v10, v11, v12, v13, v14, v15, v16) { v1, v2, v3, v4, v5, v6, v7, v8, v9, v10, v11, v12, v13, v14, v15, v16 }
 
    // Shuffle a vector
    #define JPH_NEON_SHUFFLE_F32x4(vec1, vec2, index1, index2, index3, index4) __builtin_shufflevector(vec1, vec2, index1, index2, index3, index4)
#endif
 
#endif // JPH_USE_NEON