copy from fdlibm and pass the cft after refined
Signed-off-by: rander <[email protected]>
---
backend/src/libocl/tmpl/ocl_math_common.tmpl.cl | 26 +++++++++++++++++++++++++
backend/src/libocl/tmpl/ocl_math_common.tmpl.h | 1 +
2 files changed, 27 insertions(+)
diff --git a/backend/src/libocl/tmpl/ocl_math_common.tmpl.cl
b/backend/src/libocl/tmpl/ocl_math_common.tmpl.cl
index 3a3e708..611c2e3 100644
--- a/backend/src/libocl/tmpl/ocl_math_common.tmpl.cl
+++ b/backend/src/libocl/tmpl/ocl_math_common.tmpl.cl
@@ -120,6 +120,32 @@ OVERLOADABLE double acospi(double x)
return acos(x)/M_PI;
}
+OVERLOADABLE double acosh(double x)
+{
+ double one = 1.0,
+ ln2 = 6.93147180559945286227e-01; /* 0x3FE62E42, 0xFEFA39EF */
+
+ double t;
+ int hx;
+ hx = __HI(x);
+ if(hx<0x3ff00000) { /* x < 1 */
+ return (x-x)/(x-x);
+ } else if(hx >=0x41b00000) { /* x > 2**28 */
+ if(hx >=0x7ff00000) { /* x is inf of NaN */
+ return x+x;
+ } else
+ return log(x)+ln2; /* acosh(huge)=log(2x) */
+ } else if(((hx-0x3ff00000)|__LO(x))==0) {
+ return 0.0; /* acosh(1) = 0 */
+ } else if (hx > 0x40000000) { /* 2**28 > x > 2 */
+ t=x*x;
+ return log(2.0*x-one/(x+sqrt(t-one)));
+ } else { /* 1<x<2 */
+ t = x-one;
+ return log1p(t+sqrt(2.0*t+t*t));
+ }
+}
+
OVERLOADABLE double ceil(double x)
{
double ret;
diff --git a/backend/src/libocl/tmpl/ocl_math_common.tmpl.h
b/backend/src/libocl/tmpl/ocl_math_common.tmpl.h
index 6d2f678..5bd5b36 100644
--- a/backend/src/libocl/tmpl/ocl_math_common.tmpl.h
+++ b/backend/src/libocl/tmpl/ocl_math_common.tmpl.h
@@ -22,6 +22,7 @@
OVERLOADABLE double acos(double x);
OVERLOADABLE double acospi(double x);
+OVERLOADABLE double acosh(double x);
OVERLOADABLE double ceil(double x);
OVERLOADABLE double copysign(double x, double y);
OVERLOADABLE double fabs(double x);
--
2.7.4
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