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39 /* -------------------------------------------------------------- */
40 /* PROLOG END TAG zYx */
41 #ifdef __SPU__
42 #ifndef _TRUNCF4_H_
43 #define _TRUNCF4_H_ 1
44
45 #include <spu_intrinsics.h>
46
47 /*
48 * FUNCTION
49 * vector float _truncf4(vector float x)
50 *
51 * DESCRIPTION
52 * The _truncf4 function truncates the elements of the input vector
53 * downwards (towards zero) to the nearest integer.
54 *
55 */
_truncf4(vector float x)56 static __inline vector float _truncf4(vector float x)
57 {
58 vec_int4 exp;
59 vec_uint4 or_mask, and_mask, mask;
60 vec_float4 out;
61
62 // Construct a mask to remove the fraction bits. The mask
63 // depends on the exponent of the floating point
64 // input value.
65 exp = spu_sub(127, spu_and(spu_rlmask((vec_int4) x, -23), 0xFF));
66
67 // Be sure to always preserve the sign bit
68 or_mask = spu_rlmask(spu_cmpgt(exp, 0),-1);
69
70 and_mask = spu_rlmask(spu_splats((unsigned int)0x7FFFFF), exp);
71 mask = spu_or(spu_and(and_mask, spu_cmpgt(exp, -31)), or_mask);
72
73 // Apply the mask and return the result.
74
75 out = spu_andc(x, (vec_float4) (mask));
76 return (out);
77 }
78 #endif /* _TRUNCF4_H_ */
79 #endif /* __SPU__ */
80
