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
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