Revision 5deee77b677da97c4dadc966f76d8bf01d855c57 authored by Steven Johnson on 01 April 2020, 00:47:39 UTC, committed by Steven Johnson on 01 April 2020, 00:47:39 UTC
1 parent cb6f4a9
CodeGen_Internal.h
#ifndef HALIDE_CODEGEN_INTERNAL_H
#define HALIDE_CODEGEN_INTERNAL_H
/** \file
*
* Defines functionality that's useful to multiple target-specific
* CodeGen paths, but shouldn't live in CodeGen_LLVM.h (because that's the
* front-end-facing interface to CodeGen).
*/
#include <stdint.h>
#include <memory>
#include <string>
#include "Expr.h"
#include "Scope.h"
namespace llvm {
class ConstantFolder;
class Function;
class IRBuilderDefaultInserter;
class LLVMContext;
class Module;
class StructType;
class TargetMachine;
class TargetOptions;
class Type;
class Value;
template<typename, typename>
class IRBuilder;
} // namespace llvm
namespace Halide {
struct Target;
struct Type;
namespace Internal {
class Closure;
/** The llvm type of a struct containing all of the externally referenced state of a Closure. */
llvm::StructType *build_closure_type(const Closure &closure, llvm::StructType *halide_buffer_t_type, llvm::LLVMContext *context);
/** Emit code that builds a struct containing all the externally
* referenced state. Requires you to pass it a type and struct to fill in,
* a scope to retrieve the llvm values from and a builder to place
* the packing code. */
void pack_closure(llvm::StructType *type,
llvm::Value *dst,
const Closure &closure,
const Scope<llvm::Value *> &src,
llvm::StructType *halide_buffer_t_type,
llvm::IRBuilder<llvm::ConstantFolder, llvm::IRBuilderDefaultInserter> *builder);
/** Emit code that unpacks a struct containing all the externally
* referenced state into a symbol table. Requires you to pass it a
* state struct type and value, a scope to fill, and a builder to place the
* unpacking code. */
void unpack_closure(const Closure &closure,
Scope<llvm::Value *> &dst,
llvm::StructType *type,
llvm::Value *src,
llvm::IRBuilder<llvm::ConstantFolder, llvm::IRBuilderDefaultInserter> *builder);
/** Get the llvm type equivalent to a given halide type */
llvm::Type *llvm_type_of(llvm::LLVMContext *context, Halide::Type t);
/** Which built-in functions require a user-context first argument? */
bool function_takes_user_context(const std::string &name);
/** Given a size (in bytes), return True if the allocation size can fit
* on the stack; otherwise, return False. This routine asserts if size is
* non-positive. */
bool can_allocation_fit_on_stack(int64_t size);
/** Given a Halide Euclidean division/mod operation, do constant optimizations
* and possibly call lower_euclidean_div/lower_euclidean_mod if necessary.
* Can introduce mulhi_shr and sorted_avg intrinsics as well as those from the
* lower_euclidean_ operation -- div_round_to_zero or mod_round_to_zero. */
///@{
Expr lower_int_uint_div(const Expr &a, const Expr &b);
Expr lower_int_uint_mod(const Expr &a, const Expr &b);
///@}
/** Given a Halide Euclidean division/mod operation, define it in terms of
* div_round_to_zero or mod_round_to_zero. */
///@{
Expr lower_euclidean_div(Expr a, Expr b);
Expr lower_euclidean_mod(Expr a, Expr b);
///@}
/** Given a Halide shift operation with a signed shift amount (may be negative), define
* an equivalent expression using only shifts by unsigned amounts. */
///@{
Expr lower_signed_shift_left(const Expr &a, const Expr &b);
Expr lower_signed_shift_right(const Expr &a, const Expr &b);
///@}
/** Given an llvm::Module, set llvm:TargetOptions, cpu and attr information */
void get_target_options(const llvm::Module &module, llvm::TargetOptions &options, std::string &mcpu, std::string &mattrs);
/** Given two llvm::Modules, clone target options from one to the other */
void clone_target_options(const llvm::Module &from, llvm::Module &to);
/** Given an llvm::Module, get or create an llvm:TargetMachine */
std::unique_ptr<llvm::TargetMachine> make_target_machine(const llvm::Module &module);
/** Set the appropriate llvm Function attributes given a Target. */
void set_function_attributes_for_target(llvm::Function *, Target);
/** Save a copy of the llvm IR currently represented by the module as
* data in the __LLVM,__bitcode section. Emulates clang's
* -fembed-bitcode flag and is useful to satisfy Apple's bitcode
* inclusion requirements. */
void embed_bitcode(llvm::Module *M, const std::string &halide_command);
} // namespace Internal
} // namespace Halide
#endif
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