OMPReduction¶
reduction: private copies combined with an operator at the end.
声明¶
语法¶
OMPReduction(reduction_op operator, expr* vars)
参数¶
Argument |
描述 |
|---|---|
|
the operator; see reduction_op. |
|
the variables the clause applies to. |
返回值¶
无。
描述¶
Each thread accumulates into its own copy, initialised to the identity of the operator, and the copies are combined into the original when the region ends. The operators are associative, so the order the copies are combined in does not matter.
示例¶
(OMPReduction
:operator :ReduceAdd
:vars [
(Var
:v (SymbolRef 1 "total")
)
]
)
It comes from this complete ASR text document:
(TranslationUnit
:symtab (SymbolTable
:id 0
:symbols {
"main" (Program
:symtab (SymbolTable
:id 1
:symbols {
"a" (Variable
:parent_symtab 1
:name "a"
:dependencies []
:intent :Local
:symbolic_value nil
:value nil
:storage :Default
:type (Array
:type (Integer
:kind 4
)
:dims [
(dimension
:start (IntegerConstant
:n 1
:type (Integer
:kind 4
)
:intboz_type :Decimal
)
:length (IntegerConstant
:n 3
:type (Integer
:kind 4
)
:intboz_type :Decimal
)
)
]
:physical_type :FixedSizeArray
:memory_space :Global
)
:type_declaration nil
:abi :Source
:access :Public
:presence :Required
:value_attr false
:target_attr false
:contiguous_attr false
:bindc_name nil
:is_volatile false
:is_protected false
:pass_attr :NotMethod
:self_argument nil
:codims []
)
"i" (Variable
:parent_symtab 1
:name "i"
:dependencies []
:intent :Local
:symbolic_value nil
:value nil
:storage :Default
:type (Integer
:kind 4
)
:type_declaration nil
:abi :Source
:access :Public
:presence :Required
:value_attr false
:target_attr false
:contiguous_attr false
:bindc_name nil
:is_volatile false
:is_protected false
:pass_attr :NotMethod
:self_argument nil
:codims []
)
"n" (Variable
:parent_symtab 1
:name "n"
:dependencies []
:intent :Local
:symbolic_value nil
:value nil
:storage :Default
:type (Integer
:kind 4
)
:type_declaration nil
:abi :Source
:access :Public
:presence :Required
:value_attr false
:target_attr false
:contiguous_attr false
:bindc_name nil
:is_volatile false
:is_protected false
:pass_attr :NotMethod
:self_argument nil
:codims []
)
"run" (Variable
:parent_symtab 1
:name "run"
:dependencies []
:intent :Local
:symbolic_value nil
:value nil
:storage :Default
:type (Logical
:kind 4
)
:type_declaration nil
:abi :Source
:access :Public
:presence :Required
:value_attr false
:target_attr false
:contiguous_attr false
:bindc_name nil
:is_volatile false
:is_protected false
:pass_attr :NotMethod
:self_argument nil
:codims []
)
"total" (Variable
:parent_symtab 1
:name "total"
:dependencies []
:intent :Local
:symbolic_value nil
:value nil
:storage :Default
:type (Integer
:kind 4
)
:type_declaration nil
:abi :Source
:access :Public
:presence :Required
:value_attr false
:target_attr false
:contiguous_attr false
:bindc_name nil
:is_volatile false
:is_protected false
:pass_attr :NotMethod
:self_argument nil
:codims []
)
}
)
:name "main"
:dependencies []
:body [
(OMPRegion
:region :Parallel
:clauses [
(OMPPrivate
:vars [
(Var
:v (SymbolRef 1 "i")
)
]
)
(OMPShared
:vars [
(Var
:v (SymbolRef 1 "a")
)
]
)
(OMPFirstPrivate
:vars [
(Var
:v (SymbolRef 1 "n")
)
]
)
(OMPNumThreads
:num_threads (IntegerConstant
:n 4
:type (Integer
:kind 4
)
:intboz_type :Decimal
)
)
(OMPIf
:condition (Var
:v (SymbolRef 1 "run")
)
)
]
:body [
(OMPRegion
:region :Do
:clauses [
(OMPSchedule
:kind :Static
:chunk_size (IntegerConstant
:n 1
:type (Integer
:kind 4
)
:intboz_type :Decimal
)
)
(OMPCollapse
:count (IntegerConstant
:n 1
:type (Integer
:kind 4
)
:intboz_type :Decimal
)
)
(OMPReduction
:operator :ReduceAdd
:vars [
(Var
:v (SymbolRef 1 "total")
)
]
)
(OMPLastPrivate
:vars [
(Var
:v (SymbolRef 1 "i")
)
]
)
(OMPNowait)
]
:body [
(DoLoop
:name nil
:head (do_loop_head
:v (Var
:v (SymbolRef 1 "i")
)
:start (IntegerConstant
:n 1
:type (Integer
:kind 4
)
:intboz_type :Decimal
)
:end (IntegerConstant
:n 3
:type (Integer
:kind 4
)
:intboz_type :Decimal
)
:increment (IntegerConstant
:n 1
:type (Integer
:kind 4
)
:intboz_type :Decimal
)
)
:body [
(Assignment
:target (Var
:v (SymbolRef 1 "total")
)
:value (IntegerBinOp
:left (Var
:v (SymbolRef 1 "total")
)
:op :Add
:right (Var
:v (SymbolRef 1 "i")
)
:type (Integer
:kind 4
)
:value nil
)
:overloaded nil
:realloc_lhs false
:move_allocation false
)
]
:orelse []
)
]
:exec_target :ExecAuto
)
]
:exec_target :ExecAuto
)
(OMPRegion
:region :Target
:clauses [
(OMPMap
:type :ToFrom
:vars [
(Var
:v (SymbolRef 1 "a")
)
]
)
(OMPDevice
:device (IntegerConstant
:n 0
:type (Integer
:kind 4
)
:intboz_type :Decimal
)
)
]
:body [
(OMPRegion
:region :Teams
:clauses [
(OMPNumTeams
:num_teams (IntegerConstant
:n 2
:type (Integer
:kind 4
)
:intboz_type :Decimal
)
)
(OMPThreadLimit
:thread_limit (IntegerConstant
:n 64
:type (Integer
:kind 4
)
:intboz_type :Decimal
)
)
]
:body [
(Assignment
:target (Var
:v (SymbolRef 1 "total")
)
:value (IntegerConstant
:n 0
:type (Integer
:kind 4
)
:intboz_type :Decimal
)
:overloaded nil
:realloc_lhs false
:move_allocation false
)
]
:exec_target :ExecAuto
)
]
:exec_target :ExecAuto
)
]
)
}
)
:items []
)
也可以看看¶
reduction_op, OMPPrivate, reduction_expr, OMPRegion, omp_clause