Macros and Limits

Macros for math limits.

Description

The macro names given in the following list must use the values specified. These constant expressions are suitable for use in #if preprocessing directives.

`#define FLT_DIG`	`6`
`#define FLT_MANT_DIG`	`24`
`#define FLT_MAX_10_EXP`	`+38`
`#define FLT_MAX_EXP`	`+128`
`#define FLT_MIN_10_EXP`	`-37`
`#define FLT_MIN_EXP`	`-125`
`#define FLT_RADIX`	`2`
`#define FLT_MAX`	`0x1.fffffep127f`
`#define FLT_MIN`	`0x1.0p-126f`
`#define FLT_EPSILON`	`0x1.0p-23f`

The macro names given in the following list (available if the double precision option is supported) must use the values specified. These constant expressions are suitable for use in #if preprocessing directives.

`#define DBL_DIG`	`15`
`#define DBL_MANT_DIG`	`53`
`#define DBL_MAX_10_EXP`	`+308`
`#define DBL_MAX_EXP`	`+1024`
`#define DBL_MIN_10_EXP`	`-307`
`#define DBL_MIN_EXP`	`-1021`
`#define DBL_MAX`	`0x1.fffffffffffffp1023`
`#define DBL_MIN`	`0x1.0p-1022`
`#define DBL_EPSILON`	`0x1.0p-52`

The macro names given in the following list must use the values specified. These constant expressions are suitable for use in #if preprocessing directives. An application that wants to use half and halfn types will need to include the #pragma OPENCL EXTENSION cl_khr_fp16 : enable directive.

`#define HALF_DIG`	`3`
`#define HALF_MANT_DIG`	`11`
`#define HALF_MAX_10_EXP`	`+4`
`#define HALF_MAX_EXP`	`+16`
`#define HALF_MIN_10_EXP`	`-4`
`#define HALF_MIN_EXP`	`-13`
`#define HALF_MAX`	`0x1.ffcp15h`
`#define HALF_MIN`	`0x1.0p-14h`
`#define HALF_EPSILON`	`0x1.0p-10h`

The macro names given in the following list must use the values specified. These constant expressions are suitable for use in #if preprocessing directives.

`#define CHAR_BIT`	`8`
`#define CHAR_MAX`	`SCHAR_MAX`
`#define CHAR_MIN`	`SCHAR_MIN`
`#define INT_MAX`	`2147483647`
`#define INT_MIN`	`(-2147483647- 1)`
`#define LONG_MAX`	`0x7fffffffffffffffL`
`#define LONG_MIN`	`(-0x7fffffffffffffffL- 1)`
`#define SCHAR_MAX`	`127`
`#define SCHAR_MIN`	`(-127 - 1)`
`#define SHRT_MAX`	`32767`
`#define SHRT_MIN`	`(-32767- 1)`
`#define UCHAR_MAX`	`255`
`#define USHRT_MAX`	`65535`
`#define UINT_MAX`	`0xffffffff`
`#define ULONG_MAX`	`0xffffffffffffffffUL`

Specification

OpenCL Specification

Also see

Math Functions, Symbolic Math Constants, Floating Point Pragma, Scalar Data Types, Vector Data Types, Reserved Data Types, Other Data Types

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