Deinterleave.h

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#ifndef DEINTERLEAVE_H
#define DEINTERLEAVE_H
 
/** \file
 *
 * Defines methods for splitting up a vector into the even lanes and
 * the odd lanes. Useful for optimizing expressions such as select(x %
 * 2, f(x/2), g(x/2))
 */
 
#include "Expr.h"
 
namespace Halide {
namespace Internal {
 
/** Extract the odd-numbered lanes in a vector */
Expr extract_odd_lanes(const Expr &a);
 
/** Extract the even-numbered lanes in a vector */
Expr extract_even_lanes(const Expr &a);
 
/** Extract the nth lane of a vector */
Expr extract_lane(const Expr &vec, int lane);
 
/** Look through a statement for expressions of the form select(ramp %
 * 2 == 0, a, b) and replace them with calls to an interleave
 * intrinsic */
Stmt rewrite_interleavings(const Stmt &s);
 
void deinterleave_vector_test();
 
}  // namespace Internal
}  // namespace Halide
 
#endif