## table of contents

SYMBOLIC MATH CONSTA(3clc) | OpenCL Manual | SYMBOLIC MATH CONSTA(3clc) |

# NAME¶

Symbolic_Math_Constants - The following symbolic constants are available.# BUILT-IN MATH CONSTANTS¶

The following symbolic constants are available. Their values are of type**float**and are accurate within the precision of a single precision floating-point number.

Constant Name | Description |

MAXFLOAT | Value of maximum non-infinite single-precision floating-point number. |

HUGE_VALF | A positive float constant expression. HUGE_VALF evaluates to
+infinity. Used as an error value returned by the
mathFunctions(3clc). |

INFINITY | A constant expression of type float representing positive or
unsigned infinity. |

NAN | A constant expression of type float representing a quiet
NaN. |

Constant Name | Description |

HUGE_VAL | A positive double constant expression. HUGE_VAL evaluates to
+infinity. Used as an error value returned by the built-in math
functions. |

**float**and are accurate within the precision of the

**float**type.

Constant Name | Description |

M_E_F | Value of e |

M_LOG2E_F | Value of log<sub>2</sub>e |

M_LOG10E_F | Value of log<sub>10</sub>e |

M_LN2_F | Value of log<sub>e</sub>2 |

M_LN10_F | Value of log<sub>e</sub>10 |

M_PI_F | Value of pi |

M_PI_2_F | Value of pi / 2 |

M_PI_4_F | Value of pi / 4 |

M_1_PI_F | Value of 1 / pi |

M_2_PI_F | Value of 2 / pi |

M_2_SQRTPI_F | Value of 2 / (square root of pi) |

M_SQRT2_F | Value of square root of 2 |

M_SQRT1_2_F | Value of 1 / (square root of 2) |

**double**and are accurate within the precision of the

**double**type.

Constant Name | Description |

M_E | Value of e |

M_LOG2E | Value of log<sub>2</sub>e |

M_LOG10E | Value of log<sub>10</sub>e |

M_LN2 | Value of log<sub>e</sub>2 |

M_LN10 | Value of log<sub>e</sub>10 |

M_PI | Value of pi |

M_PI_2 | Value of pi / 2 |

M_PI_4 | Value of pi / 4 |

M_1_PI | Value of 1 / pi |

M_2_PI | Value of 2 / pi |

M_2_SQRTPI | Value of 2 / (square root of pi) |

M_SQRT2 | Value of square root of 2 |

M_SQRT1_2 | Value of 1 / (square root of 2) |

**half**and are accurate within the precision of the

**half**type. An application that wants to use

**half**and

**half**

*n*types will need to include the #pragma OPENCL EXTENSION

**cl_khr_fp16**(3clc) : enable directive.

Constant | Description |

M_E_H | Value of e |

M_LOG2E_H | Value of log<sub>2</sub>e |

M_LOG10E_H | Value of log<sub>10</sub>e |

M_LN2_H | Value of log<sub>e</sub>2 |

M_LN10_H | Value of log<sub>e</sub>10 |

M_PI_H | Value of pi |

M_PI_2_H | Value of pi / 2 |

M_PI_4_H | Value of pi / 4 |

M_1_PI_H | Value of 1 / pi |

M_2_PI_H | Value of 2 / pi |

M_2_SQRTPI_H | Value of 2 / (square root of pi) |

M_SQRT2_H | Value of square root of 2 |

M_SQRT1_2_H | Value of 1 / (square root of 2) |

# SPECIFICATION¶

**OpenCL Specification**[1]

# SEE ALSO¶

**mathFunctions**(3clc),

**FP_CONTRACT**(3clc),

**macroLimits**(3clc)

# AUTHORS¶

**The Khronos Group**

# COPYRIGHT¶

Copyright © 2007-2011 The Khronos Group Inc.# NOTES¶

- 1.
- OpenCL Specification

page 251, section 6.12.2 - Table at end of Math
Functions

06/18/2014 | The Khronos Group |