Simplify.h

Go to the documentation of this file.

#ifndef HALIDE_SIMPLIFY_H
#define HALIDE_SIMPLIFY_H
 
/** \file
 * Methods for simplifying halide statements and expressions
 */
 
#include "Expr.h"
#include "Interval.h"
#include "ModulusRemainder.h"
#include "Scope.h"
 
namespace Halide {
namespace Internal {
 
/** Perform a wide range of simplifications to expressions and statements,
 * including constant folding, substituting in trivial values, arithmetic
 * rearranging, etc. Simplifies across let statements, so must not be called on
 * stmts with dangling or repeated variable names. Can optionally be passed
 * known bounds of any variables, known alignment properties, and any other
 * Exprs that should be assumed to be true.
 */
// @{
Stmt simplify(const Stmt &,
              bool remove_dead_code = true,
              const Scope<Interval> &bounds = Scope<Interval>::empty_scope(),
              const Scope<ModulusRemainder> &alignment = Scope<ModulusRemainder>::empty_scope(),
              const std::vector<Expr> &assumptions = std::vector<Expr>());
Expr simplify(const Expr &,
              bool remove_dead_code = true,
              const Scope<Interval> &bounds = Scope<Interval>::empty_scope(),
              const Scope<ModulusRemainder> &alignment = Scope<ModulusRemainder>::empty_scope(),
              const std::vector<Expr> &assumptions = std::vector<Expr>());
// @}
 
/** Attempt to statically prove an expression is true using the simplifier. */
bool can_prove(Expr e, const Scope<Interval> &bounds = Scope<Interval>::empty_scope());
 
/** Simplify expressions found in a statement, but don't simplify
 * across different statements. This is safe to perform at an earlier
 * stage in lowering than full simplification of a stmt. */
Stmt simplify_exprs(const Stmt &);
 
}  // namespace Internal
}  // namespace Halide
 
#endif