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AMDGPUSupport.rst

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AMDGPU Support

Clang supports OpenCL, HIP and OpenMP on AMD GPU targets.

Predefined Macros

Macro Description
__AMDGPU__ Indicates that the code is being compiled for an AMD GPU.
__AMDGCN__ Defined if the GPU target is AMDGCN.
__R600__ Defined if the GPU target is R600.
__<ArchName>__ Defined with the name of the architecture (e.g., __gfx906__ for the gfx906 architecture).
__<GFXN>__ Defines the GFX family (e.g., for gfx906, this macro would be __GFX9__).
__amdgcn_processor__ Defined with the processor name as a string (e.g., "gfx906").
__amdgcn_target_id__ Defined with the target ID as a string.
__amdgcn_feature_<feature-name>__ Defined for each supported target feature. The value is 1 if the feature is enabled and 0 if it is disabled. Allowed feature names are sramecc and xnack.
__AMDGCN_CDNA_VERSION__ Defined with the CDNA version as an integer if the processor belongs to the CDNA generation.
__AMDGCN_CUMODE__ Defined as 1 if the CU mode is enabled and 0 if the WGP mode is enabled.
__AMDGCN_UNSAFE_FP_ATOMICS__ Defined if unsafe floating-point atomics are allowed.
__AMDGCN_WAVEFRONT_SIZE__ Defines the wavefront size. Allowed values are 32 and 64.
__AMDGCN_WAVEFRONT_SIZE Alias to __AMDGCN_WAVEFRONT_SIZE__. To be deprecated.
__HAS_FMAF__ Defined if FMAF instruction is available (deprecated).
__HAS_LDEXPF__ Defined if LDEXPF instruction is available (deprecated).
__HAS_FP64__ Defined if FP64 instruction is available (deprecated).

Please note that the specific architecture and feature names will vary depending on the GPU. Also, some macros are deprecated and may be removed in future releases.