Eigen::internal::count_bits_impl< BitsType, EnableIf > Struct Template Reference

#include <MathFunctions.h>

Static Public Member Functions
static EIGEN_DEVICE_FUNC int	clz (BitsType bits)
static EIGEN_DEVICE_FUNC int	ctz (BitsType bits)

Member Function Documentation

clz()

template<typename BitsType , typename EnableIf = void>

static EIGEN_DEVICE_FUNC int Eigen::internal::count_bits_impl< BitsType, EnableIf >::clz ( BitsType  bits )

inlinestatic

                                                         {
    int n = CHAR_BIT * sizeof(BitsType);
    int shift = n / 2;
    while (bits > 0 && shift > 0) {
      BitsType y = bits >> shift;
      if (y > 0) {
        n -= shift;
        bits = y;
      }
      shift /= 2;
    }
    if (shift == 0) {
      --n;
    }
    return n;
  }

References Eigen::test::bits(), n, and Eigen::internal::y.

Referenced by Eigen::internal::clz().

ctz()

template<typename BitsType , typename EnableIf = void>

static EIGEN_DEVICE_FUNC int Eigen::internal::count_bits_impl< BitsType, EnableIf >::ctz ( BitsType  bits )

inlinestatic

                                                         {
    int n = CHAR_BIT * sizeof(BitsType);
    int shift = n / 2;
    while (bits > 0 && shift > 0) {
      BitsType y = bits << shift;
      if (y > 0) {
        n -= shift;
        bits = y;
      }
      shift /= 2;
    }
    if (shift == 0) {
      --n;
    }
    return n;
  }

References Eigen::test::bits(), n, and Eigen::internal::y.

Referenced by Eigen::internal::ctz().

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The documentation for this struct was generated from the following file:

• MathFunctions.h