GpuThreadIndex¶
The index of the running thread within its block.
Declaration¶
Syntax¶
GpuThreadIndex(int dim, ttype type, expr? value)
Arguments¶
Argument |
Description |
|---|---|
|
which dimension to report, counting from zero. |
|
the type of the expression. |
|
the compile time value of the expression, when the frontend could fold it; |
Return values¶
The value of the expression.
Description¶
Every thread of a kernel runs the same body, and this is what tells them
apart. The index counts from zero within the block; the position in the whole
grid is GpuBlockIndex * GpuBlockSize + GpuThreadIndex.
Examples¶
(GpuThreadIndex
:dim 0
:type (Integer
:kind 4
)
:value nil
)
It comes from this complete ASR text document:
(TranslationUnit
:symtab (SymbolTable
:id 0
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"m" (Module
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:symbols {
"scale" (GpuKernelFunction
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)
:name "scale"
:function_signature (FunctionType
:arg_types [
(Array
:type (Real
:kind 4
)
:dims [
(dimension
:start (IntegerConstant
:n 1
:type (Integer
:kind 4
)
:intboz_type :Decimal
)
:length (IntegerConstant
:n 256
:type (Integer
:kind 4
)
:intboz_type :Decimal
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:physical_type :FixedSizeArray
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:return_var_type nil
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)
:dependencies []
:args [
(Var
:v (SymbolRef 2 "a")
)
]
:body [
(Assignment
:target (Var
:v (SymbolRef 2 "i")
)
:value (IntegerBinOp
:left (GpuThreadIndex
:dim 0
:type (Integer
:kind 4
)
:value nil
)
:op :Add
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:n 1
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)
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(Assignment
:target (Var
:v (SymbolRef 2 "i")
)
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:dim 0
:type (Integer
:kind 4
)
:value nil
)
:op :Mul
:right (GpuBlockSize
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:type (Integer
:kind 4
)
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:kind 4
)
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)
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)
(Assignment
:target (ArrayItem
:v (Var
:v (SymbolRef 2 "a")
)
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(array_index
:left nil
:right (Var
:v (SymbolRef 2 "i")
)
:step nil
)
]
:type (Real
:kind 4
)
:storage_format :ColMajor
:value nil
)
:value (RealConstant
:r 0.0
:type (Real
:kind 4
)
)
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:realloc_lhs false
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)
]
:access :Public
)
}
)
:name "m"
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)
"main" (Program
:symtab (SymbolTable
:id 3
:symbols {}
)
:name "main"
:dependencies []
:body []
)
}
)
:items []
)
See Also¶
GpuKernelFunction, GpuKernelLaunch, GpuThreadIndex, GpuBlockIndex, GpuBlockSize