Retro68/gcc/newlib/libm/machine/spu/headers/floorf4.h
2012-03-27 01:51:53 +02:00

106 lines
4.5 KiB
C

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/* PROLOG END TAG zYx */
#ifdef __SPU__
#ifndef _FLOORF4_H_
#define _FLOORF4_H_ 1
#include <spu_intrinsics.h>
/*
* FUNCTION
* vector float _floorf4(vector float value)
*
* DESCRIPTION
* The _floorf4 routine rounds a vector of input values "value" downwards
* to their nearest integer returning the result as a vector of floats.
*
* The full range form (default) provides floor computation on
* all IEEE floating point values. The floor of NANs remain NANs.
* The floor of denorms results in zero.
*
*/
static __inline vector float _floorf4(vector float value)
{
/* FULL FLOATING-POINT RANGE
*/
vec_int4 exp, shift;
vec_uint4 mask, frac_mask, addend, insert, pos;
vec_float4 out;
/* This function generates the following component
* based upon the inputs.
*
* mask = bits of the input that need to be replaced.
* insert = value of the bits that need to be replaced
* addend = value to be added to perform function.
*
* These are applied as follows:.
*
* out = ((in & mask) | insert) + addend
*/
pos = spu_cmpgt((vec_int4)value, -1);
exp = spu_and(spu_rlmask((vec_int4)value, -23), 0xFF);
shift = spu_sub(127, exp);
frac_mask = spu_and(spu_rlmask(spu_splats((unsigned int)0x7FFFFF), shift),
spu_cmpgt((vec_int4)shift, -31));
mask = spu_orc(frac_mask, spu_cmpgt(exp, 126));
addend = spu_andc(spu_andc(spu_add(mask, 1), pos), spu_cmpeq(spu_and((vec_uint4)value, mask), 0));
insert = spu_andc(spu_andc(spu_splats((unsigned int)0xBF800000), pos),
spu_cmpgt((vec_uint4)spu_add(exp, -1), 126));
out = (vec_float4)spu_add(spu_sel((vec_uint4)value, insert, mask), addend);
/* Preserve orignal sign bit (for -0 case)
*/
out = spu_sel(out, value, spu_splats((unsigned int)0x80000000));
return (out);
}
#endif /* _FLOORF4_H_ */
#endif /* __SPU__ */