[Beignet] [PATCH] [PATCH]GBE: improve precision of atanh
Zhigang Gong
zhigang.gong at linux.intel.com
Mon Dec 30 22:00:00 PST 2013
Pushed, thanks.
On Tue, Dec 31, 2013 at 06:05:14AM +0000, Song, Ruiling wrote:
> Tested ok.
>
> -----Original Message-----
> From: beignet-bounces at lists.freedesktop.org [mailto:beignet-bounces at lists.freedesktop.org] On Behalf Of Lv Meng
> Sent: Monday, December 23, 2013 12:09 PM
> To: beignet at lists.freedesktop.org
> Cc: Lv, Meng
> Subject: [Beignet] [PATCH] [PATCH]GBE: improve precision of atanh
>
>
> Signed-off-by: Lv Meng <meng.lv at intel.com>
> ---
> backend/src/ocl_stdlib.tmpl.h | 20 +++++++++++++++++---
> 1 file changed, 17 insertions(+), 3 deletions(-)
>
> diff --git a/backend/src/ocl_stdlib.tmpl.h b/backend/src/ocl_stdlib.tmpl.h index 6ae7cd8..0dc6b0f 100755
> --- a/backend/src/ocl_stdlib.tmpl.h
> +++ b/backend/src/ocl_stdlib.tmpl.h
> @@ -1793,9 +1793,6 @@ INLINE_OVERLOADABLE float __gen_ocl_internal_atan(float x) { INLINE_OVERLOADABLE float __gen_ocl_internal_atanpi(float x) {
> return __gen_ocl_internal_atan(x) / M_PI_F; } -INLINE_OVERLOADABLE float __gen_ocl_internal_atanh(float x) {
> - return 0.5f * native_sqrt((1 + x) / (1 - x)); -} INLINE_OVERLOADABLE float __gen_ocl_internal_erf(float x) {
> return M_2_SQRTPI_F * (x - __gen_ocl_pow(x, 3) / 3 + __gen_ocl_pow(x, 5) / 10 - __gen_ocl_pow(x, 7) / 42 + __gen_ocl_pow(x, 9) / 216); } @@ -2352,6 +2349,23 @@ INLINE_OVERLOADABLE float __gen_ocl_internal_ldexp(float x, int n) {
> return x;
> }
>
> +INLINE_OVERLOADABLE float __gen_ocl_internal_atanh(float x) {
> + //return 0.5f * native_sqrt((1 + x) / (1 - x));
> + float xa = __gen_ocl_fabs (x);
> + float t;
> + if (isless (xa, 0.5f)){
> + if (xa < 0x1.0p-28f) return x;
> + t = xa + xa;
> + t = 0.5f * log1p (t + t * xa / (1.0f - xa));
> + } else if (isless (xa, 1.0f)){
> + t = 0.5f * log1p ((xa + xa) / (1.0f - xa));
> + } else{
> + if (isgreater (xa, 1.0f)) return (x - x) / (x - x);
> + return x / 0.0f;
> + }
> + return __gen_ocl_internal_copysign(t, x); }
> +
> // TODO use llvm intrinsics definitions #define cos native_cos #define cospi __gen_ocl_internal_cospi
> --
> 1.7.10.4
>
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