Halide 22.0.0 Halide compiler and libraries

Loading...
Searching...
No Matches
Parameter.h
Go to the documentation of this file.
1#ifndef HALIDE_PARAMETER_H
2#define HALIDE_PARAMETER_H
3
4/** \file
5 * Defines the internal representation of parameters to halide piplines
6 */
7#include <optional>
8#include <string>
9
10#include "Buffer.h"
11#include "IntrusivePtr.h"
12#include "Type.h"
13#include "Util.h" // for HALIDE_NO_USER_CODE_INLINE
14#include "runtime/HalideRuntime.h" // for HALIDE_ALWAYS_INLINE
15
16 namespace Halide {
17
18 struct ArgumentEstimates;
19 struct Expr;
20 struct Type;
21 enum class MemoryType;
22
23 struct BufferConstraint {
24 Expr min, extent, stride;
25 Expr min_estimate, extent_estimate;
26};
27
28 namespace Internal {
29
30#ifdef WITH_SERIALIZATION
31 class Deserializer;
32 class Serializer;
33#endif
34 struct ParameterContents;
35
36} // namespace Internal
37
38/** A reference-counted handle to a parameter to a halide
39 * pipeline. May be a scalar parameter or a buffer */
40 class Parameter {
41 void check_defined() const;
42 void check_is_buffer() const;
43 void check_is_scalar() const;
44 void check_dim_ok(int dim) const;
45 void check_type(const Type &t) const;
46
47 protected:
48 Internal::IntrusivePtr<Internal::ParameterContents> contents;
49
50#ifdef WITH_SERIALIZATION
51 friend class Internal::Deserializer; //< for scalar_data()
52 friend class Internal::Serializer; //< for scalar_data()
53#endif
54 friend class Pipeline; //< for read_only_scalar_address()
55
56 /** Get the raw currently-bound buffer. null if unbound */
57 const halide_buffer_t *raw_buffer() const;
58
59 /** Get the pointer to the current value of the scalar
60 * parameter. For a given parameter, this address will never
61 * change. Note that this can only be used to *read* from -- it must
62 * not be written to, so don't cast away the constness. Only relevant when jitting. */
63 const void *read_only_scalar_address() const;
64
65 /** If the Parameter is a scalar, and the scalar data is valid, return
66 * the scalar data. Otherwise, return nullopt. */
67 std::optional<halide_scalar_value_t> scalar_data() const;
68
69 /** If the Parameter is a scalar and has a valid scalar value, return it.
70 * Otherwise, assert-fail. */
71 halide_scalar_value_t scalar_data_checked() const;
72
73 /** If the Parameter is a scalar *of the given type* and has a valid scalar value, return it.
74 * Otherwise, assert-fail. */
75 halide_scalar_value_t scalar_data_checked(const Type &val_type) const;
76
77 /** Construct a new buffer parameter via deserialization. */
78 Parameter(const Type &t, int dimensions, const std::string &name,
79 const Buffer<void> &buffer, int host_alignment, const std::vector<BufferConstraint> &buffer_constraints,
80 MemoryType memory_type);
81
82 /** Construct a new scalar parameter via deserialization. */
83 Parameter(const Type &t, int dimensions, const std::string &name,
84 const std::optional<halide_scalar_value_t> &scalar_data, const Expr &scalar_default, const Expr &scalar_min,
85 const Expr &scalar_max, const Expr &scalar_estimate);
86
87 public:
88 /** Construct a new undefined handle */
89 Parameter() = default;
90
91 /** Construct a new parameter of the given type. If the second
92 * argument is true, this is a buffer parameter of the given
93 * dimensionality, otherwise, it is a scalar parameter (and the
94 * dimensionality should be zero). The parameter will be given a
95 * unique auto-generated name. */
96 Parameter(const Type &t, bool is_buffer, int dimensions);
97
98 /** Construct a new parameter of the given type with name given by
99 * the third argument. If the second argument is true, this is a
100 * buffer parameter, otherwise, it is a scalar parameter. The
101 * third argument gives the dimensionality of the buffer
102 * parameter. It should be zero for scalar parameters. If the
103 * fifth argument is true, the the name being passed in was
104 * explicitly specified (as opposed to autogenerated). */
105 Parameter(const Type &t, bool is_buffer, int dimensions, const std::string &name);
106
107 Parameter(const Parameter &) = default;
108 Parameter &operator=(const Parameter &) = default;
109 Parameter(Parameter &&) = default;
110 Parameter &operator=(Parameter &&) = default;
111
112 /** Get the type of this parameter */
113 Type type() const;
114
115 /** Get the dimensionality of this parameter. Zero for scalars. */
116 int dimensions() const;
117
118 /** Get the name of this parameter */
119 const std::string &name() const;
120
121 /** Does this parameter refer to a buffer/image? */
122 bool is_buffer() const;
123
124 /** If the parameter is a scalar parameter, get its currently
125 * bound value. Only relevant when jitting */
126 template<typename T>
127 HALIDE_NO_USER_CODE_INLINE T scalar() const {
128 static_assert(sizeof(T) <= sizeof(halide_scalar_value_t));
129 const auto sv = scalar_data_checked(type_of<T>());
130 T t;
131 memcpy(&t, &sv.u.u64, sizeof(t));
132 return t;
133 }
134
135 /** This returns the current value of scalar<type()>() as an Expr.
136 * If the Parameter is not scalar, or its scalar data is not valid, this will assert-fail. */
137 Expr scalar_expr() const;
138
139 /** This returns true if scalar_expr() would return a valid Expr,
140 * false if not. */
141 bool has_scalar_value() const;
142
143 /** If the parameter is a scalar parameter, set its current
144 * value. Only relevant when jitting */
145 template<typename T>
146 HALIDE_NO_USER_CODE_INLINE void set_scalar(T val) {
147 halide_scalar_value_t sv;
148 memcpy(&sv.u.u64, &val, sizeof(val));
149 set_scalar(type_of<T>(), sv);
150 }
151
152 /** If the parameter is a scalar parameter, set its current
153 * value. Only relevant when jitting */
154 void set_scalar(const Type &val_type, halide_scalar_value_t val);
155
156 /** If the parameter is a buffer parameter, get its currently
157 * bound buffer. Only relevant when jitting */
158 Buffer<void> buffer() const;
159
160 /** If the parameter is a buffer parameter, set its current
161 * value. Only relevant when jitting */
162 void set_buffer(const Buffer<void> &b);
163
164 /** Tests if this handle is the same as another handle */
165 bool same_as(const Parameter &other) const;
166
167 /** Tests if this handle is non-nullptr */
168 bool defined() const;
169
170 /** Get and set constraints for the min, extent, stride, and estimates on
171 * the min/extent. */
172 //@{
173 void set_min_constraint(int dim, const Expr &e);
174 void set_extent_constraint(int dim, const Expr &e);
175 void set_stride_constraint(int dim, const Expr &e);
176 void set_min_constraint_estimate(int dim, const Expr &min);
177 void set_extent_constraint_estimate(int dim, const Expr &extent);
178 void set_host_alignment(int bytes);
179 Expr min_constraint(int dim) const;
180 Expr extent_constraint(int dim) const;
181 Expr stride_constraint(int dim) const;
182 Expr min_constraint_estimate(int dim) const;
183 Expr extent_constraint_estimate(int dim) const;
184 int host_alignment() const;
185 //@}
186
187 /** Get buffer constraints for all dimensions,
188 * only relevant when serializing. */
189 const std::vector<BufferConstraint> &buffer_constraints() const;
190
191 /** Get and set constraints for scalar parameters. These are used
192 * directly by Param, so they must be exported. */
193 // @{
194 void set_min_value(const Expr &e);
195 Expr min_value() const;
196 void set_max_value(const Expr &e);
197 Expr max_value() const;
198 void set_estimate(Expr e);
199 Expr estimate() const;
200 // @}
201
202 /** Get and set the default values for scalar parameters. At present, these
203 * are used only to emit the default values in the metadata. There isn't
204 * yet a public API in Param<> for them (this is used internally by the
205 * Generator code). */
206 // @{
207 void set_default_value(const Expr &e);
208 Expr default_value() const;
209 // @}
210
211 /** Order Parameters by their IntrusivePtr so they can be used
212 * to index maps. */
213 bool operator<(const Parameter &other) const {
214 return contents < other.contents;
215 }
216
217 /** Get the ArgumentEstimates appropriate for this Parameter. */
218 ArgumentEstimates get_argument_estimates() const;
219
220 void store_in(MemoryType memory_type);
221 MemoryType memory_type() const;
222
223 void trace_loads();
224 bool is_tracing_loads() const;
225
226 void add_trace_tag(const std::string &trace_tag);
227 std::vector<std::string> get_trace_tags() const;
228};
229
230 namespace Internal {
231
232/** Validate arguments to a call to a func, image or imageparam. */
233 void check_call_arg_types(const std::string &name, std::vector<Expr> *args, int dims);
234
235} // namespace Internal
236} // namespace Halide
237
238#endif
Buffer.h
HalideRuntime.h
This file declares the routines used by Halide internally in its runtime.
IntrusivePtr.h
Support classes for reference-counting via intrusive shared pointers.
Type.h
Defines halide types.
Util.h
Various utility functions used internally Halide.
HALIDE_NO_USER_CODE_INLINE
#define HALIDE_NO_USER_CODE_INLINE
Definition Util.h:47
Halide::Buffer
A Halide::Buffer is a named shared reference to a Halide::Runtime::Buffer.
Definition Buffer.h:122
Halide::Parameter
A reference-counted handle to a parameter to a halide pipeline.
Definition Parameter.h:40
Halide::Parameter::set_stride_constraint
void set_stride_constraint(int dim, const Expr &e)
Halide::Parameter::set_default_value
void set_default_value(const Expr &e)
Get and set the default values for scalar parameters.
Halide::Parameter::operator=
Parameter & operator=(Parameter &&)=default
Halide::Parameter::set_min_constraint_estimate
void set_min_constraint_estimate(int dim, const Expr &min)
Halide::Parameter::store_in
void store_in(MemoryType memory_type)
Halide::Parameter::set_extent_constraint_estimate
void set_extent_constraint_estimate(int dim, const Expr &extent)
Halide::Parameter::default_value
Expr default_value() const
Halide::Parameter::dimensions
int dimensions() const
Get the dimensionality of this parameter.
Halide::Parameter::estimate
Expr estimate() const
Halide::Parameter::set_max_value
void set_max_value(const Expr &e)
Halide::Parameter::set_min_constraint
void set_min_constraint(int dim, const Expr &e)
Get and set constraints for the min, extent, stride, and estimates on the min/extent.
Halide::Parameter::add_trace_tag
void add_trace_tag(const std::string &trace_tag)
Halide::Parameter::name
const std::string & name() const
Get the name of this parameter.
Halide::Parameter::max_value
Expr max_value() const
Halide::Parameter::set_extent_constraint
void set_extent_constraint(int dim, const Expr &e)
Halide::Parameter::Parameter
Parameter(const Type &t, bool is_buffer, int dimensions, const std::string &name)
Construct a new parameter of the given type with name given by the third argument.
Halide::Parameter::scalar
HALIDE_NO_USER_CODE_INLINE T scalar() const
If the parameter is a scalar parameter, get its currently bound value.
Definition Parameter.h:127
Halide::Parameter::get_trace_tags
std::vector< std::string > get_trace_tags() const
Halide::Parameter::defined
bool defined() const
Tests if this handle is non-nullptr.
Halide::Parameter::set_buffer
void set_buffer(const Buffer< void > &b)
If the parameter is a buffer parameter, set its current value.
Halide::Parameter::is_tracing_loads
bool is_tracing_loads() const
Halide::Parameter::stride_constraint
Expr stride_constraint(int dim) const
Halide::Parameter::Parameter
Parameter(const Type &t, int dimensions, const std::string &name, const Buffer< void > &buffer, int host_alignment, const std::vector< BufferConstraint > &buffer_constraints, MemoryType memory_type)
Construct a new buffer parameter via deserialization.
Halide::Parameter::set_min_value
void set_min_value(const Expr &e)
Get and set constraints for scalar parameters.
Halide::Parameter::min_constraint
Expr min_constraint(int dim) const
Halide::Parameter::has_scalar_value
bool has_scalar_value() const
This returns true if scalar_expr() would return a valid Expr, false if not.
Halide::Parameter::scalar_data_checked
halide_scalar_value_t scalar_data_checked(const Type &val_type) const
If the Parameter is a scalar of the given type and has a valid scalar value, return it.
Halide::Parameter::is_buffer
bool is_buffer() const
Does this parameter refer to a buffer/image?
Halide::Parameter::min_value
Expr min_value() const
Halide::Parameter::set_scalar
HALIDE_NO_USER_CODE_INLINE void set_scalar(T val)
If the parameter is a scalar parameter, set its current value.
Definition Parameter.h:146
Halide::Parameter::operator=
Parameter & operator=(const Parameter &)=default
Halide::Parameter::set_host_alignment
void set_host_alignment(int bytes)
Halide::Parameter::set_estimate
void set_estimate(Expr e)
Halide::Parameter::contents
Internal::IntrusivePtr< Internal::ParameterContents > contents
Definition Parameter.h:48
Halide::Parameter::Parameter
Parameter(Parameter &&)=default
Halide::Parameter::scalar_data_checked
halide_scalar_value_t scalar_data_checked() const
If the Parameter is a scalar and has a valid scalar value, return it.
Halide::Parameter::type
Type type() const
Get the type of this parameter.
Halide::Parameter::extent_constraint_estimate
Expr extent_constraint_estimate(int dim) const
Halide::Parameter::read_only_scalar_address
const void * read_only_scalar_address() const
Get the pointer to the current value of the scalar parameter.
Halide::Parameter::get_argument_estimates
ArgumentEstimates get_argument_estimates() const
Get the ArgumentEstimates appropriate for this Parameter.
Halide::Parameter::min_constraint_estimate
Expr min_constraint_estimate(int dim) const
Halide::Parameter::raw_buffer
const halide_buffer_t * raw_buffer() const
Get the raw currently-bound buffer.
Halide::Parameter::host_alignment
int host_alignment() const
Halide::Parameter::buffer
Buffer< void > buffer() const
If the parameter is a buffer parameter, get its currently bound buffer.
Halide::Parameter::memory_type
MemoryType memory_type() const
Halide::Parameter::extent_constraint
Expr extent_constraint(int dim) const
Halide::Parameter::set_scalar
void set_scalar(const Type &val_type, halide_scalar_value_t val)
If the parameter is a scalar parameter, set its current value.
Halide::Parameter::Parameter
Parameter(const Type &t, bool is_buffer, int dimensions)
Construct a new parameter of the given type.
Halide::Parameter::trace_loads
void trace_loads()
Halide::Parameter::scalar_data
std::optional< halide_scalar_value_t > scalar_data() const
If the Parameter is a scalar, and the scalar data is valid, return the scalar data.
Halide::Parameter::Parameter
Parameter(const Type &t, int dimensions, const std::string &name, const std::optional< halide_scalar_value_t > &scalar_data, const Expr &scalar_default, const Expr &scalar_min, const Expr &scalar_max, const Expr &scalar_estimate)
Construct a new scalar parameter via deserialization.
Halide::Parameter::scalar_expr
Expr scalar_expr() const
This returns the current value of scalar<type()>() as an Expr.
Halide::Parameter::buffer_constraints
const std::vector< BufferConstraint > & buffer_constraints() const
Get buffer constraints for all dimensions, only relevant when serializing.
Halide::Parameter::Parameter
Parameter(const Parameter &)=default
Halide::Parameter::operator<
bool operator<(const Parameter &other) const
Order Parameters by their IntrusivePtr so they can be used to index maps.
Definition Parameter.h:213
Halide::Parameter::same_as
bool same_as(const Parameter &other) const
Tests if this handle is the same as another handle.
Halide::Parameter::Parameter
Parameter()=default
Construct a new undefined handle.
Halide::Pipeline
A class representing a Halide pipeline.
Definition Pipeline.h:107
Halide::Internal::check_call_arg_types
void check_call_arg_types(const std::string &name, std::vector< Expr > *args, int dims)
Validate arguments to a call to a func, image or imageparam.
Halide::Internal::SyntheticParamType::Type
@ Type
Halide
This file defines the class FunctionDAG, which is our representation of a Halide pipeline,...
Definition AbstractGenerator.h:19
Halide::LinkageType::Internal
@ Internal
Not visible externally, similar to 'static' linkage in C.
Halide::cast
Internal::ConstantInterval cast(Type t, const Internal::ConstantInterval &a)
Cast operators for ConstantIntervals.
Halide::MemoryType
MemoryType
An enum describing different address spaces to be used with Func::store_in.
Definition Expr.h:353
memcpy
void * memcpy(void *s1, const void *s2, size_t n)
Halide::ArgumentEstimates
Definition Argument.h:18
Halide::BufferConstraint
Definition Parameter.h:23
Halide::BufferConstraint::min_estimate
Expr min_estimate
Definition Parameter.h:25
Halide::BufferConstraint::stride
Expr stride
Definition Parameter.h:24
Halide::BufferConstraint::extent_estimate
Expr extent_estimate
Definition Parameter.h:25
Halide::BufferConstraint::min
Expr min
Definition Parameter.h:24
Halide::BufferConstraint::extent
Expr extent
Definition Parameter.h:24
Halide::Expr
A fragment of Halide syntax.
Definition Expr.h:258
Halide::Internal::IntrusivePtr
Intrusive shared pointers have a reference count (a RefCount object) stored in the class itself.
Definition IntrusivePtr.h:71
Halide::Type
Types in the halide type system.
Definition Type.h:281
halide_buffer_t
The raw representation of an image passed around by generated Halide code.
Definition HalideRuntime.h:1569
halide_scalar_value_t
halide_scalar_value_t is a simple union able to represent all the well-known scalar values in a filte...
Definition HalideRuntime.h:1741