Retro68/gcc/newlib/libm/machine/spu/headers/ldexpd2.h
2012-03-27 01:51:53 +02:00

98 lines
4.2 KiB
C

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#ifdef __SPU__
#ifndef _LDEXPD2_H_
#define _LDEXPD2_H_ 1
#include <spu_intrinsics.h>
/*
* FUNCTION
* vector double _ldexpd2(vector double x, vector signed long long exp)
*
* DESCRIPTION
* The _ldexpd2 function Computes x * 2^exp for each of the two elements
* of x using the corresponding elements of exp.
*
*/
static __inline vector double _ldexpd2(vector double x, vector signed long long llexp)
{
vec_uchar16 odd_to_even = ((vec_uchar16) { 4,5,6,7, 0x80,0x80,0x80,0x80,
12,13,14,15, 0x80,0x80,0x80,0x80 });
vec_int4 exp;
vec_int4 e1, e2;
vec_int4 min = spu_splats(-2044);
vec_int4 max = spu_splats(2046);
vec_uint4 cmp_min, cmp_max;
vec_uint4 shift = (vec_uint4) { 20, 32, 20, 32 };
vec_double2 f1, f2;
vec_double2 out;
exp = (vec_int4)spu_shuffle(llexp, llexp, odd_to_even);
/* Clamp the specified exponent to the range -2044 to 2046.
*/
cmp_min = spu_cmpgt(exp, min);
cmp_max = spu_cmpgt(exp, max);
exp = spu_sel(min, exp, cmp_min);
exp = spu_sel(exp, max, cmp_max);
/* Generate the factors f1 = 2^e1 and f2 = 2^e2
*/
e1 = spu_rlmaska(exp, -1);
e2 = spu_sub(exp, e1);
f1 = (vec_double2)spu_sl(spu_add(e1, 1023), shift);
f2 = (vec_double2)spu_sl(spu_add(e2, 1023), shift);
/* Compute the product x * 2^e1 * 2^e2
*/
out = spu_mul(spu_mul(x, f1), f2);
return (out);
}
#endif /* _LDEXPD2_H_ */
#endif /* __SPU__ */