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Scalar_Data_Types - Built-in scalar data types.
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Copyright
Copyright © 2007-2011 The Khronos Group Inc.
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and/or
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Description
These are the data types available in the OpenCL C programming language used to create kernels that are
executed on OpenCL device(s). The OpenCL C programming language (also referred to as OpenCL C) is based
on the ISO/IEC 9899:1999 C language specification (a.k.a. C99 specification) with specific extensions and
restrictions. Please refer to the ISO/IEC 9899:1999 specification for a detailed description of the
language grammar. This section describes modifications and restrictions to ISO/IEC 9899:1999 supported in
OpenCL C.
Most built-in scalar data types are also declared as appropriate types in the OpenCL API (and header
files) that can be used by an application. The following table describes the built-in scalar data type in
the OpenCL C programming language and the corresponding data type available to the application:
┌────────────────────────────┬──────────────────────────────┬──────────────────────────┐
│ TypeinOpenCLCLanguage │ Description │ APItypeforapplication │
├────────────────────────────┼──────────────────────────────┼──────────────────────────┤
│ bool │ A conditional data type │ n/a │
│ │ which is either true or │ │
│ │ false. The value true │ │
│ │ expands to the integer │ │
│ │ constant 1 and the value │ │
│ │ false expands to the integer │ │
│ │ constant 0. When any scalar │ │
│ │ value is converted to bool, │ │
│ │ the result is 0 if the value │ │
│ │ compares equal to 0; │ │
│ │ otherwise, the result is 1. │ │
├────────────────────────────┼──────────────────────────────┼──────────────────────────┤
│ char │ A signed two's complement │ cl_char │
│ │ 8-bit integer. │ │
├────────────────────────────┼──────────────────────────────┼──────────────────────────┤
│ unsignedchar, │ An unsigned 8-bit integer. │ cl_uchar │
│ uchar │ │ │
│ │ │ │
├────────────────────────────┼──────────────────────────────┼──────────────────────────┤
│ short │ A signed two's complement │ cl_short │
│ │ 16-bit integer. │ │
├────────────────────────────┼──────────────────────────────┼──────────────────────────┤
│ unsignedshort, │ An unsigned 16-bit integer. │ cl_ushort │
│ ushort │ │ │
│ │ │ │
├────────────────────────────┼──────────────────────────────┼──────────────────────────┤
│ int │ A signed two's complement │ cl_int │
│ │ 32-bit integer. │ │
├────────────────────────────┼──────────────────────────────┼──────────────────────────┤
│ unsignedint, │ An unsigned 32-bit integer. │ cl_uint │
│ uint │ │ │
│ │ │ │
├────────────────────────────┼──────────────────────────────┼──────────────────────────┤
│ long │ A signed two's complement │ cl_long │
│ │ 64-bit integer. │ │
├────────────────────────────┼──────────────────────────────┼──────────────────────────┤
│ unsignedlong, │ An unsigned 64-bit integer. │ cl_ulong │
│ ulong │ │ │
│ │ │ │
├────────────────────────────┼──────────────────────────────┼──────────────────────────┤
│ float │ A 32-bit floating point. The │ cl_float │
│ │ float data type must conform │ │
│ │ to the IEEE 754 single │ │
│ │ precision storage format. │ │
├────────────────────────────┼──────────────────────────────┼──────────────────────────┤
│ double │ A 64-bit floating point. The │ cl_double │
│ │ double data type must │ │
│ │ conform to the IEEE 754 │ │
│ │ double precision storage │ │
│ │ format. The double scalar │ │
│ │ type is an optional type │ │
│ │ that is supported if │ │
│ │ CL_DEVICE_DOUBLE_FP_CONFIG │ │
│ │ for a device is not zero. │ │
│ │ See the table for param_name │ │
│ │ for clGetDeviceInfo(3clc) │ │
│ │ for details. │ │
├────────────────────────────┼──────────────────────────────┼──────────────────────────┤
│ half │ A 16-bit float. The half │ cl_half │
│ │ data type must conform to │ │
│ │ the IEEE 754-2008 half │ │
│ │ precision storage format. │ │
├────────────────────────────┼──────────────────────────────┼──────────────────────────┤
│ size_t │ The unsigned integer type of │ n/a │
│ │ the result of the sizeof │ │
│ │ operator. This is a 32-bit │ │
│ │ unsigned integer if │ │
│ │ CL_DEVICE_ADDRESS_BITS │ │
│ │ defined in │ │
│ │ clGetDeviceInfo(3clc) is │ │
│ │ 32-bits and is a 64-bit │ │
│ │ unsigned integer if │ │
│ │ CL_DEVICE_ADDRESS_BITS is │ │
│ │ 64-bits. │ │
├────────────────────────────┼──────────────────────────────┼──────────────────────────┤
│ ptrdiff_t │ A signed integer type that │ n/a │
│ │ is the result of subtracting │ │
│ │ two pointers. This is a │ │
│ │ 32-bit signed integer if │ │
│ │ CL_DEVICE_ADDRESS_BITS │ │
│ │ defined in │ │
│ │ clGetDeviceInfo(3clc) is │ │
│ │ 32-bits and is a 64-bit │ │
│ │ signed integer if │ │
│ │ CL_DEVICE_ADDRESS_BITS is │ │
│ │ 64-bits. │ │
├────────────────────────────┼──────────────────────────────┼──────────────────────────┤
│ intptr_t │ A signed integer type with │ n/a │
│ │ the property that any valid │ │
│ │ pointer to void can be │ │
│ │ converted to this type, then │ │
│ │ converted back to pointer to │ │
│ │ void, and the result will │ │
│ │ compare equal to the │ │
│ │ original pointer. This is a │ │
│ │ 32-bit signed integer if │ │
│ │ CL_DEVICE_ADDRESS_BITS │ │
│ │ defined in table 4.3 is │ │
│ │ 32-bits and is a 64-bit │ │
│ │ signed integer if │ │
│ │ CL_DEVICE_ADDRESS_BITS is │ │
│ │ 64-bits. │ │
├────────────────────────────┼──────────────────────────────┼──────────────────────────┤
│ uintptr_t │ An unsigned integer type │ n/a │
│ │ with the property that any │ │
│ │ valid pointer to void can be │ │
│ │ converted to this type, then │ │
│ │ converted back to pointer to │ │
│ │ void, and the result will │ │
│ │ compare equal to the │ │
│ │ original pointer. This is a │ │
│ │ 32-bit signed integer if │ │
│ │ CL_DEVICE_ADDRESS_BITS │ │
│ │ defined in table 4.3 is │ │
│ │ 32-bits and is a 64-bit │ │
│ │ signed integer if │ │
│ │ CL_DEVICE_ADDRESS_BITS is │ │
│ │ 64-bits. │ │
├────────────────────────────┼──────────────────────────────┼──────────────────────────┤
│ void │ The void type comprises an │ void │
│ │ empty set of values; it is │ │
│ │ an incomplete type that │ │
│ │ cannot be completed. │ │
└────────────────────────────┴──────────────────────────────┴──────────────────────────┘
Name
Scalar_Data_Types - Built-in scalar data types.
Notes
1. OpenCL Specification
page 195, section 6.1.1 - Built-in Scalar Data Types
The Khronos Group 11/18/2024 SCALARDATATYPES(3clc)
Optional Half Floating Point
The half floating-point is supported as an optional extension. An application that wants to use half and
halfn will need to include the cl_khr_fp16(3clc) directive. This will extended the list of built-in
vector and scalar data types to include the following:
┌─────────────────────────┬──────────────────────────────┬──────────────────────────┐
│ TypeinOpenCLLanguage │ Description │ APItypeforapplication │
├─────────────────────────┼──────────────────────────────┼──────────────────────────┤
│ half2 │ A 2-component half-precision │ cl_half2 │
│ │ floating-point vector. │ │
├─────────────────────────┼──────────────────────────────┼──────────────────────────┤
│ half3 │ A 3-component half-precision │ cl_half3 │
│ │ floating-point vector. │ │
├─────────────────────────┼──────────────────────────────┼──────────────────────────┤
│ half4 │ A 4-component half-precision │ cl_half4 │
│ │ floating-point vector. │ │
├─────────────────────────┼──────────────────────────────┼──────────────────────────┤
│ half8 │ An 8-component │ cl_half8 │
│ │ half-precision │ │
│ │ floating-point vector. │ │
├─────────────────────────┼──────────────────────────────┼──────────────────────────┤
│ half16 │ A 16-component │ cl_half16 │
│ │ half-precision │ │
│ │ floating-point vector. │ │
└─────────────────────────┴──────────────────────────────┴──────────────────────────┘
The relational, equality, logical and logical unary operators can be used with half scalar and halfn
vector types and shall produce a scalar int and vector shortn result respectively.
The OpenCL compiler accepts an h and H suffix on floating point literals, indicating the literal is typed
as a half.
See Also
macroLimits(3clc), vectorDataTypes(3clc), reservedDataTypes(3clc), otherDataTypes(3clc), abstractDataTypes(3clc), enums(3clc), cl_khr_fp16(3clc), cl_khr_fp64(3clc)
Specification
OpenCLSpecification[1]
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