text: /*
   * Copyright (c) 2014 Advanced Micro Devices, Inc.
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */
  
  #include <clc/clc.h>
  
  _CLC_OVERLOAD _CLC_DEF float length(float p) {
    return fabs(p);
  }
  
  #define V_FLENGTH(p)                     \
    float l2 = dot(p, p);                  \
                                           \
    if (l2 < FLT_MIN) {                    \
      p *= 0x1.0p+86F;                     \
      return sqrt(dot(p, p)) * 0x1.0p-86F; \
    } else if (l2 == INFINITY) {           \
      p *= 0x1.0p-65F;                     \
      return sqrt(dot(p, p)) * 0x1.0p+65F; \
    }                                      \
                                           \
    return sqrt(l2);
  
  _CLC_OVERLOAD _CLC_DEF float length(float2 p) {
    V_FLENGTH(p);
  }
  
  _CLC_OVERLOAD _CLC_DEF float length(float3 p) {
    V_FLENGTH(p);
  }
  
  _CLC_OVERLOAD _CLC_DEF float length(float4 p) {
    V_FLENGTH(p);
  }
  
  #ifdef cl_khr_fp64
  #pragma OPENCL EXTENSION cl_khr_fp64 : enable
  
  _CLC_OVERLOAD _CLC_DEF double length(double p){
    return fabs(p);
  }
  
  #define V_DLENGTH(p)                       \
    double l2 = dot(p, p);                   \
                                             \
    if (l2 < DBL_MIN) {                      \
        p *= 0x1.0p+563;                     \
        return sqrt(dot(p, p)) * 0x1.0p-563; \
    } else if (l2 == INFINITY) {             \
        p *= 0x1.0p-513;                     \
        return sqrt(dot(p, p)) * 0x1.0p+513; \
    }                                        \
                                             \
    return sqrt(l2);
  
  _CLC_OVERLOAD _CLC_DEF double length(double2 p) {
    V_DLENGTH(p);
  }
  
  _CLC_OVERLOAD _CLC_DEF double length(double3 p) {
    V_DLENGTH(p);
  }
  
  _CLC_OVERLOAD _CLC_DEF double length(double4 p) {
    V_DLENGTH(p);
  }
  
  #endif
  
  #ifdef cl_khr_fp16
  #pragma OPENCL EXTENSION cl_khr_fp16 : enable
  
  _CLC_OVERLOAD _CLC_DEF half length(half p){
    return fabs(p);
  }
  
  // Only available in CLC1.2
  #ifndef HALF_MIN
  #define HALF_MIN   0x1.0p-14h
  #endif
  
  #define V_HLENGTH(p)                       \
    half l2 = dot(p, p);                     \
                                             \
    if (l2 < HALF_MIN) {                     \
        p *= 0x1.0p+12h;                     \
        return sqrt(dot(p, p)) * 0x1.0p-12h; \
    } else if (l2 == INFINITY) {             \
        p *= 0x1.0p-7h;                      \
        return sqrt(dot(p, p)) * 0x1.0p+7h;  \
    }                                        \
                                             \
    return sqrt(l2);
  
  _CLC_OVERLOAD _CLC_DEF half length(half2 p) {
    V_HLENGTH(p);
  }
  
  _CLC_OVERLOAD _CLC_DEF half length(half3 p) {
    V_HLENGTH(p);
  }
  
  _CLC_OVERLOAD _CLC_DEF half length(half4 p) {
    V_HLENGTH(p);
  }
  
  #endif
  