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/* PROLOG END TAG zYx                                              */
#ifdef __SPU__
#ifndef _TRUNCF4_H_
#define _TRUNCF4_H_ 1

#include <spu_intrinsics.h>

/*
 * FUNCTION
 *      vector float _truncf4(vector float x)
 *
 * DESCRIPTION
 *      The _truncf4 function truncates the elements of the input vector
 *      downwards (towards zero) to the nearest integer.
 *
 */
static __inline vector float
_truncf4(vector float x)
{
    vec_int4   exp;
    vec_uint4  or_mask, and_mask, mask;
    vec_float4 out;

    // Construct a mask to remove the fraction bits. The mask
    // depends on the exponent of the floating point
    // input value.
    exp = spu_sub(127, spu_and(spu_rlmask((vec_int4)x, -23), 0xFF));

    // Be sure to always preserve the sign bit
    or_mask = spu_rlmask(spu_cmpgt(exp, 0), -1);

    and_mask = spu_rlmask(spu_splats((unsigned int)0x7FFFFF), exp);
    mask = spu_or(spu_and(and_mask, spu_cmpgt(exp, -31)), or_mask);

    // Apply the mask and return the result.

    out = spu_andc(x, (vec_float4)(mask));
    return (out);
}
#endif /* _TRUNCF4_H_ */
#endif /* __SPU__ */
