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/* PROLOG END TAG zYx */
#ifdef __SPU__
#ifndef _TRUNCD2_H_
#define _TRUNCD2_H_ 1
#include <spu_intrinsics.h>
/*
* FUNCTION
* vector double _truncd2(vector double x)
*
* DESCRIPTION
* The _truncd2 function truncates the elements of the input vector
* downwards (towards zero) to the nearest integer.
*/
static __inline vector double _truncd2(vector double in)
{
vec_uchar16 splat_hi = (vec_uchar16) { 0,1,2,3,0,1,2,3, 8,9,10,11, 8,9,10,11 };
vec_int4 exp, shift;
vec_uint4 sign = (vec_uint4) { 0x80000000, 0, 0x80000000, 0 };
vec_uint4 or_mask, and_mask, mask;
vec_double2 in_hi, out;
/* Construct a mask to remove the fraction bits. The mask
* depends on the exponent of the floating point
* input value.
in_hi = spu_shuffle(in, in, splat_hi);
exp = spu_and(spu_rlmask((vec_int4)in_hi, -20), 0x7FF);
shift = spu_sub(((vec_int4) { 1023, 1043, 1023, 1043 }), exp);
or_mask = spu_andc(spu_cmpgt(shift, 0), sign);
and_mask = spu_rlmask(((vec_uint4) { 0xFFFFF, -1, 0xFFFFF, -1 }), shift);
mask = spu_or(spu_and(and_mask, spu_cmpgt(shift, -32)), or_mask);
/* Apply the mask and return the result.
out = spu_andc(in, (vec_double2)(mask));
return (out);
}
#endif /* _TRUNCD2_H_ */
#endif /* __SPU__ */
