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| /* PROLOG END TAG zYx */ |
| #ifdef __SPU__ |
| #ifndef _SINHF4_H_ |
| #define _SINHF4_H_ 1 |
| |
| #include <spu_intrinsics.h> |
| |
| #include "expf4.h" |
| #include "recipf4.h" |
| |
| |
| /* |
| * FUNCTION |
| * vector float _sinhf4(vector float angle) |
| * |
| * DESCRIPTION |
| * The _sinhf4 function computes the hyperbolic sine of a vector of |
| * angles (expressed in radians) to an accuracy of a single precision |
| * floating point. |
| * |
| */ |
| static __inline vector float _sinhf4(vector float x) |
| { |
| // 1.0000 (above this number, use sinh(x) = 0.5 * (e^x - e^-x) |
| vec_uint4 threshold = (vec_uint4)spu_splats(0x3F800000); |
| |
| vec_uint4 sign_mask = (vec_uint4)spu_splats(0x80000000); |
| |
| // Coefficents for the Taylor series |
| vec_float4 f03 = spu_splats(1.6666666666666667E-1f); // 1/3! |
| vec_float4 f05 = spu_splats(8.3333333333333333E-3f); // 1/5! |
| vec_float4 f07 = spu_splats(1.9841269841269841E-4f); // 1/7! |
| vec_float4 f09 = spu_splats(2.7557319223985891E-6f); // 1/9! |
| vec_float4 f11 = spu_splats(2.5052108385441719E-8f); // 1/11! |
| |
| |
| // Perform the calculation as a Taylor series |
| vec_float4 result; |
| vec_float4 x2 = spu_mul(x,x); |
| result = spu_madd(x2,f11,f09); |
| result = spu_madd(x2,result,f07); |
| result = spu_madd(x2,result,f05); |
| result = spu_madd(x2,result,f03); |
| result = spu_madd(x2,result,spu_splats(1.0f)); |
| result = spu_mul(x,result); |
| |
| |
| // Perform calculation as a function of 0.5 * (e^x - e^-x) |
| vec_float4 ex =_expf4(x); |
| vec_float4 ex_inv = _recipf4(ex); |
| |
| vec_float4 r2= spu_sub(ex,ex_inv); |
| r2 = spu_mul(r2,spu_splats(0.5f)); |
| |
| vec_uint4 xabs = spu_andc((vec_uint4)x,sign_mask); |
| vec_uint4 use_exp = spu_cmpgt(xabs,threshold); |
| |
| // Select either the Taylor or exp version |
| result = spu_sel(result,r2,use_exp); |
| |
| // Flip the sign if needed |
| result = (vec_float4)spu_or((vec_uint4)result,spu_and((vec_uint4)x,sign_mask)); |
| |
| return result; |
| |
| } |
| #endif /* _SINHF4_H_ */ |
| #endif /* __SPU__ */ |