FindIntrinsics.h

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#ifndef HALIDE_FIND_INTRINSICS_H
#define HALIDE_FIND_INTRINSICS_H
 
/** \file
 * Tools to replace common patterns with more readily recognizable intrinsics.
 */
 
#include "IR.h"
 
namespace Halide {
namespace Internal {
 
/** Implement intrinsics with non-intrinsic using equivalents. */
Expr lower_widen_right_add(const Expr &a, const Expr &b);
Expr lower_widen_right_mul(const Expr &a, const Expr &b);
Expr lower_widen_right_sub(const Expr &a, const Expr &b);
Expr lower_widening_add(const Expr &a, const Expr &b);
Expr lower_widening_mul(const Expr &a, const Expr &b);
Expr lower_widening_sub(const Expr &a, const Expr &b);
Expr lower_widening_shift_left(const Expr &a, const Expr &b);
Expr lower_widening_shift_right(const Expr &a, const Expr &b);
 
Expr lower_rounding_shift_left(const Expr &a, const Expr &b);
Expr lower_rounding_shift_right(const Expr &a, const Expr &b);
 
Expr lower_saturating_add(const Expr &a, const Expr &b);
Expr lower_saturating_sub(const Expr &a, const Expr &b);
Expr lower_saturating_cast(const Type &t, const Expr &a);
 
Expr lower_halving_add(const Expr &a, const Expr &b);
Expr lower_halving_sub(const Expr &a, const Expr &b);
Expr lower_rounding_halving_add(const Expr &a, const Expr &b);
 
Expr lower_mul_shift_right(const Expr &a, const Expr &b, const Expr &q);
Expr lower_rounding_mul_shift_right(const Expr &a, const Expr &b, const Expr &q);
 
/** Replace one of the above ops with equivalent arithmetic. */
Expr lower_intrinsic(const Call *op);
 
/** Replace common arithmetic patterns with intrinsics. */
Stmt find_intrinsics(const Stmt &s);
Expr find_intrinsics(const Expr &e);
 
/** The reverse of find_intrinsics. */
Expr lower_intrinsics(const Expr &e);
Stmt lower_intrinsics(const Stmt &s);
 
}  // namespace Internal
}  // namespace Halide
 
#endif