Signed-off-by: rander <rander.w...@intel.com> --- backend/src/libocl/tmpl/ocl_math.tmpl.cl | 68 +++++++++++++++++++++++++++++ backend/src/libocl/tmpl/ocl_math_20.tmpl.cl | 68 +++++++++++++++++++++++++++++ 2 files changed, 136 insertions(+)
diff --git a/backend/src/libocl/tmpl/ocl_math.tmpl.cl b/backend/src/libocl/tmpl/ocl_math.tmpl.cl index a3428c8..f0c40fc 100644 --- a/backend/src/libocl/tmpl/ocl_math.tmpl.cl +++ b/backend/src/libocl/tmpl/ocl_math.tmpl.cl @@ -4103,3 +4103,71 @@ OVERLOADABLE double log(double x) } +OVERLOADABLE double log2(double x) +{ + double ln2 = 0.69314718055994530942, + zero = 0, + two54 = 1.80143985094819840000e+16, /* 43500000 00000000 */ + Lg1 = 6.666666666666735130e-01, /* 3FE55555 55555593 */ + Lg2 = 3.999999999940941908e-01, /* 3FD99999 9997FA04 */ + Lg3 = 2.857142874366239149e-01, /* 3FD24924 94229359 */ + Lg4 = 2.222219843214978396e-01, /* 3FCC71C5 1D8E78AF */ + Lg5 = 1.818357216161805012e-01, /* 3FC74664 96CB03DE */ + Lg6 = 1.531383769920937332e-01, /* 3FC39A09 D078C69F */ + Lg7 = 1.479819860511658591e-01; /* 3FC2F112 DF3E5244 */ + + double hfsq,f,s,z,R,w,t1,t2,dk; + int k,hx,i,j; + uint lx; + + hx = __HI(x); + lx = __LO(x); + + k=0; + if (hx < 0x00100000) + { /* x < 2**-1022 */ + if (((hx&0x7fffffff)|lx)==0) + return -two54/(x-x); /* log(+-0)=-inf */ + + if (hx<0) return (x-x)/(x-x); /* log(-#) = NaN */ + + k -= 54; x *= two54; /* subnormal number, scale up x */ + hx = __HI(x); + } + + if (hx >= 0x7ff00000) return x+x; + k += (hx>>20)-1023; + hx &= 0x000fffff; + i = (hx+0x95f64)&0x100000; + __setHigh(&x,hx|(i^0x3ff00000)); /* normalize x or x/2 */ + k += (i>>20); + dk = (double) k; + f = x-1.0; + + if((0x000fffff&(2+hx))<3) + { /* |f| < 2**-20 */ + if(f==zero) return dk; + R = f*f*(0.5-0.33333333333333333*f); + return dk-(R-f)/ln2; + } + + s = f/(2.0+f); + z = s*s; + i = hx-0x6147a; + w = z*z; + j = 0x6b851-hx; + t1= w*(Lg2+w*(Lg4+w*Lg6)); + t2= z*(Lg1+w*(Lg3+w*(Lg5+w*Lg7))); + i |= j; + R = t2+t1; + if(i>0) + { + hfsq=0.5*f*f; + return dk-((hfsq-(s*(hfsq+R)))-f)/ln2; + } + else + { + return dk-((s*(f-R))-f)/ln2; + } +} + diff --git a/backend/src/libocl/tmpl/ocl_math_20.tmpl.cl b/backend/src/libocl/tmpl/ocl_math_20.tmpl.cl index 0f355b1..ea2ee37 100644 --- a/backend/src/libocl/tmpl/ocl_math_20.tmpl.cl +++ b/backend/src/libocl/tmpl/ocl_math_20.tmpl.cl @@ -3979,5 +3979,73 @@ OVERLOADABLE double log(double x) } +OVERLOADABLE double log2(double x) +{ + double ln2 = 0.69314718055994530942, + zero = 0, + two54 = 1.80143985094819840000e+16, /* 43500000 00000000 */ + Lg1 = 6.666666666666735130e-01, /* 3FE55555 55555593 */ + Lg2 = 3.999999999940941908e-01, /* 3FD99999 9997FA04 */ + Lg3 = 2.857142874366239149e-01, /* 3FD24924 94229359 */ + Lg4 = 2.222219843214978396e-01, /* 3FCC71C5 1D8E78AF */ + Lg5 = 1.818357216161805012e-01, /* 3FC74664 96CB03DE */ + Lg6 = 1.531383769920937332e-01, /* 3FC39A09 D078C69F */ + Lg7 = 1.479819860511658591e-01; /* 3FC2F112 DF3E5244 */ + + double hfsq,f,s,z,R,w,t1,t2,dk; + int k,hx,i,j; + uint lx; + + hx = __HI(x); + lx = __LO(x); + + k=0; + if (hx < 0x00100000) + { /* x < 2**-1022 */ + if (((hx&0x7fffffff)|lx)==0) + return -two54/(x-x); /* log(+-0)=-inf */ + + if (hx<0) return (x-x)/(x-x); /* log(-#) = NaN */ + + k -= 54; x *= two54; /* subnormal number, scale up x */ + hx = __HI(x); + } + + if (hx >= 0x7ff00000) return x+x; + k += (hx>>20)-1023; + hx &= 0x000fffff; + i = (hx+0x95f64)&0x100000; + __setHigh(&x,hx|(i^0x3ff00000)); /* normalize x or x/2 */ + k += (i>>20); + dk = (double) k; + f = x-1.0; + + if((0x000fffff&(2+hx))<3) + { /* |f| < 2**-20 */ + if(f==zero) return dk; + R = f*f*(0.5-0.33333333333333333*f); + return dk-(R-f)/ln2; + } + + s = f/(2.0+f); + z = s*s; + i = hx-0x6147a; + w = z*z; + j = 0x6b851-hx; + t1= w*(Lg2+w*(Lg4+w*Lg6)); + t2= z*(Lg1+w*(Lg3+w*(Lg5+w*Lg7))); + i |= j; + R = t2+t1; + if(i>0) + { + hfsq=0.5*f*f; + return dk-((hfsq-(s*(hfsq+R)))-f)/ln2; + } + else + { + return dk-((s*(f-R))-f)/ln2; + } +} + -- 2.7.4 _______________________________________________ Beignet mailing list Beignet@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/beignet