Built-in Math Constants
| 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 built-in math functions. |
| HUGE_VAL | A positive double expression that evaluates to + infinity. Used as an error value returned by the built-in math functions. (Available if the built-in math functions are extended with cl_khr_fp64.) |
| INFINITY | A constant expression of type float representing positive or unsigned infinity. |
| NAN | A constant expression of type float representing a quiet NaN. |
Float and Double Math Constants
The following constants are also available. They are of type 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 log2e |
| M_LOG10E_F | Value of log10e |
| M_LN2_F | Value of loge2 |
| M_LN10_F | Value of loge10 |
| 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) |
The following constants are available if the built-in math functions are extended with cl_khr_fp64. They are of type double and are accurate within the precision of the double type.
| Constant Name | Description |
|---|---|
| M_E | Value of e |
| M_LOG2E | Value of log2e |
| M_LOG10E | Value of log10e |
| M_LN2 | Value of loge2 |
| M_LN10 | Value of loge10 |
| 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) |
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