Halide 22.0.0 Halide compiler and libraries

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Argument.h
Go to the documentation of this file.
1#ifndef HALIDE_ARGUMENT_H
2#define HALIDE_ARGUMENT_H
3
4/** \file
5 * Defines a type used for expressing the type signature of a
6 * generated halide pipeline
7 */
8
9#include "Expr.h"
10#include "Type.h"
11#include "runtime/HalideRuntime.h"
12
13 namespace Halide {
14
15 template<typename T, int Dims>
16 class Buffer;
17
18 struct ArgumentEstimates {
19 /** If this is a scalar argument, then these are its default, min, max, and estimated values.
20 * For buffer arguments, all should be undefined. */
21 Expr scalar_def, scalar_min, scalar_max, scalar_estimate;
22
23 /** If this is a buffer argument, these are the estimated min and
24 * extent for each dimension. If there are no estimates,
25 * buffer_estimates.size() can be zero; otherwise, it must always
26 * equal the dimensions */
27 Region buffer_estimates;
28
29 bool operator==(const ArgumentEstimates &rhs) const;
30};
31
32/**
33 * A struct representing an argument to a halide-generated
34 * function. Used for specifying the function signature of
35 * generated code.
36 */
37 struct Argument {
38 /** The name of the argument */
39 std::string name;
40
41 /** An argument is either a primitive type (for parameters), or a
42 * buffer pointer.
43 *
44 * If kind == InputScalar, then type fully encodes the expected type
45 * of the scalar argument.
46 *
47 * If kind == InputBuffer|OutputBuffer, then type.bytes() should be used
48 * to determine* elem_size of the buffer; additionally, type.code *should*
49 * reflect the expected interpretation of the buffer data (e.g. float vs int),
50 * but there is no runtime enforcement of this at present.
51 */
52 enum Kind {
53 InputScalar = halide_argument_kind_input_scalar,
54 InputBuffer = halide_argument_kind_input_buffer,
55 OutputBuffer = halide_argument_kind_output_buffer
56 };
57 Kind kind = InputScalar;
58
59 /** If kind == InputBuffer|OutputBuffer, this is the dimensionality of the buffer.
60 * If kind == InputScalar, this value is ignored (and should always be set to zero) */
61 uint8_t dimensions = 0;
62
63 /** If this is a scalar parameter, then this is its type.
64 *
65 * If this is a buffer parameter, this this is the type of its
66 * elements.
67 *
68 * Note that type.lanes should always be 1 here. */
69 Type type;
70
71 /* The estimates (if any) and default/min/max values (if any) for this Argument. */
72 ArgumentEstimates argument_estimates;
73
74 Argument() = default;
75 Argument(const std::string &_name, Kind _kind, const Type &_type, int _dimensions,
76 const ArgumentEstimates &argument_estimates);
77
78 // Not explicit, so that you can put Buffer in an argument list,
79 // to indicate that it shouldn't be baked into the object file,
80 // but instead received as an argument at runtime
81 template<typename T, int Dims>
82 Argument(const Buffer<T, Dims> &im)
83 : name(im.name()),
84 kind(InputBuffer),
85 dimensions(im.dimensions()),
86 type(im.type()) {
87 }
88
89 bool is_buffer() const {
90 return kind == InputBuffer || kind == OutputBuffer;
91 }
92 bool is_scalar() const {
93 return kind == InputScalar;
94 }
95
96 bool is_input() const {
97 return kind == InputScalar || kind == InputBuffer;
98 }
99 bool is_output() const {
100 return kind == OutputBuffer;
101 }
102
103 bool operator==(const Argument &rhs) const {
104 return name == rhs.name &&
105 kind == rhs.kind &&
106 dimensions == rhs.dimensions &&
107 type == rhs.type &&
108 argument_estimates == rhs.argument_estimates;
109 }
110};
111
112} // namespace Halide
113
114#endif
Expr.h
Base classes for Halide expressions (Halide::Expr) and statements (Halide::Internal::Stmt)
HalideRuntime.h
This file declares the routines used by Halide internally in its runtime.
halide_argument_kind_output_buffer
@ halide_argument_kind_output_buffer
Definition HalideRuntime.h:1766
halide_argument_kind_input_scalar
@ halide_argument_kind_input_scalar
Definition HalideRuntime.h:1764
halide_argument_kind_input_buffer
@ halide_argument_kind_input_buffer
Definition HalideRuntime.h:1765
Type.h
Defines halide types.
Halide::Buffer
A Halide::Buffer is a named shared reference to a Halide::Runtime::Buffer.
Definition Buffer.h:122
Halide::Internal::ArgInfoKind::Buffer
@ Buffer
Halide
This file defines the class FunctionDAG, which is our representation of a Halide pipeline,...
Definition AbstractGenerator.h:19
Halide::cast
Internal::ConstantInterval cast(Type t, const Internal::ConstantInterval &a)
Cast operators for ConstantIntervals.
Halide::Region
std::vector< Range > Region
A multi-dimensional box.
Definition Expr.h:350
uint8_t
unsigned __INT8_TYPE__ uint8_t
Definition runtime_internal.h:29
Halide::ArgumentEstimates
Definition Argument.h:18
Halide::ArgumentEstimates::buffer_estimates
Region buffer_estimates
If this is a buffer argument, these are the estimated min and extent for each dimension.
Definition Argument.h:27
Halide::ArgumentEstimates::operator==
bool operator==(const ArgumentEstimates &rhs) const
Halide::ArgumentEstimates::scalar_min
Expr scalar_min
Definition Argument.h:21
Halide::ArgumentEstimates::scalar_def
Expr scalar_def
If this is a scalar argument, then these are its default, min, max, and estimated values.
Definition Argument.h:21
Halide::ArgumentEstimates::scalar_estimate
Expr scalar_estimate
Definition Argument.h:21
Halide::ArgumentEstimates::scalar_max
Expr scalar_max
Definition Argument.h:21
Halide::Argument
A struct representing an argument to a halide-generated function.
Definition Argument.h:37
Halide::Argument::is_input
bool is_input() const
Definition Argument.h:96
Halide::Argument::is_buffer
bool is_buffer() const
Definition Argument.h:89
Halide::Argument::is_scalar
bool is_scalar() const
Definition Argument.h:92
Halide::Argument::Argument
Argument(const std::string &_name, Kind _kind, const Type &_type, int _dimensions, const ArgumentEstimates &argument_estimates)
Halide::Argument::kind
Kind kind
Definition Argument.h:57
Halide::Argument::Argument
Argument()=default
Halide::Argument::is_output
bool is_output() const
Definition Argument.h:99
Halide::Argument::name
std::string name
The name of the argument.
Definition Argument.h:39
Halide::Argument::type
Type type
If this is a scalar parameter, then this is its type.
Definition Argument.h:69
Halide::Argument::Argument
Argument(const Buffer< T, Dims > &im)
Definition Argument.h:82
Halide::Argument::operator==
bool operator==(const Argument &rhs) const
Definition Argument.h:103
Halide::Argument::Kind
Kind
An argument is either a primitive type (for parameters), or a buffer pointer.
Definition Argument.h:52
Halide::Argument::InputBuffer
@ InputBuffer
Definition Argument.h:54
Halide::Argument::InputScalar
@ InputScalar
Definition Argument.h:53
Halide::Argument::OutputBuffer
@ OutputBuffer
Definition Argument.h:55
Halide::Argument::dimensions
uint8_t dimensions
If kind == InputBuffer|OutputBuffer, this is the dimensionality of the buffer.
Definition Argument.h:61
Halide::Argument::argument_estimates
ArgumentEstimates argument_estimates
Definition Argument.h:72
Halide::Expr
A fragment of Halide syntax.
Definition Expr.h:258
Halide::Type
Types in the halide type system.
Definition Type.h:283