[Beignet] [Patch for Release_v0.9.x 4/6] GBE: fix bug in pow/pown.
Zhigang Gong
zhigang.gong at linux.intel.com
Tue Nov 4 21:43:18 PST 2014
The subject is incorrect, should be fix bug in tgamma.
On Wed, Nov 05, 2014 at 01:14:43PM +0800, Zhigang Gong wrote:
> tgamma is actually lgamma, a related but very different function.
>
> This patch is from:
> https://bugs.debian.org/cgi-bin/bugreport.cgi?msg=5;filename=Fix-pow-erf-tgamma.patch;att=3;bug=768090
>
> Signed-off-by: Zhigang Gong <zhigang.gong at intel.com>
> ---
> backend/src/ocl_stdlib.tmpl.h | 189 ++----------------------------------------
> 1 file changed, 7 insertions(+), 182 deletions(-)
>
> diff --git a/backend/src/ocl_stdlib.tmpl.h b/backend/src/ocl_stdlib.tmpl.h
> index cacba85..1b89109 100755
> --- a/backend/src/ocl_stdlib.tmpl.h
> +++ b/backend/src/ocl_stdlib.tmpl.h
> @@ -1565,188 +1565,6 @@ INLINE_OVERLOADABLE float native_log2(float x) { return __gen_ocl_log(x); }
> INLINE_OVERLOADABLE float native_log(float x) {
> return native_log2(x) * 0.6931472002f;
> }
> -INLINE_OVERLOADABLE float tgamma(float x) {
> -/*
> - * ====================================================
> - * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
> - *
> - * Developed at SunPro, a Sun Microsystems, Inc. business.
> - * Permission to use, copy, modify, and distribute this
> - * software is freely granted, provided that this notice
> - * is preserved.
> - * ====================================================
> - */
> - float pi = 3.1415927410e+00,
> - a0 = 7.7215664089e-02,
> - a1 = 3.2246702909e-01,
> - a2 = 6.7352302372e-02,
> - a3 = 2.0580807701e-02,
> - a4 = 7.3855509982e-03,
> - a5 = 2.8905137442e-03,
> - a6 = 1.1927076848e-03,
> - a7 = 5.1006977446e-04,
> - a8 = 2.2086278477e-04,
> - a9 = 1.0801156895e-04,
> - a10 = 2.5214456400e-05,
> - a11 = 4.4864096708e-05,
> - tc = 1.4616321325e+00,
> - tf = -1.2148628384e-01,
> - tt = 6.6971006518e-09,
> - t0 = 4.8383611441e-01,
> - t1 = -1.4758771658e-01,
> - t2 = 6.4624942839e-02,
> - t3 = -3.2788541168e-02,
> - t4 = 1.7970675603e-02,
> - t5 = -1.0314224288e-02,
> - t6 = 6.1005386524e-03,
> - t7 = -3.6845202558e-03,
> - t8 = 2.2596477065e-03,
> - t9 = -1.4034647029e-03,
> - t10 = 8.8108185446e-04,
> - t11 = -5.3859531181e-04,
> - t12 = 3.1563205994e-04,
> - t13 = -3.1275415677e-04,
> - t14 = 3.3552918467e-04,
> - u0 = -7.7215664089e-02,
> - u1 = 6.3282704353e-01,
> - u2 = 1.4549225569e+00,
> - u3 = 9.7771751881e-01,
> - u4 = 2.2896373272e-01,
> - u5 = 1.3381091878e-02,
> - v1 = 2.4559779167e+00,
> - v2 = 2.1284897327e+00,
> - v3 = 7.6928514242e-01,
> - v4 = 1.0422264785e-01,
> - v5 = 3.2170924824e-03,
> - s0 = -7.7215664089e-02,
> - s1 = 2.1498242021e-01,
> - s2 = 3.2577878237e-01,
> - s3 = 1.4635047317e-01,
> - s4 = 2.6642270386e-02,
> - s5 = 1.8402845599e-03,
> - s6 = 3.1947532989e-05,
> - r1 = 1.3920053244e+00,
> - r2 = 7.2193557024e-01,
> - r3 = 1.7193385959e-01,
> - r4 = 1.8645919859e-02,
> - r5 = 7.7794247773e-04,
> - r6 = 7.3266842264e-06,
> - w0 = 4.1893854737e-01,
> - w1 = 8.3333335817e-02,
> - w2 = -2.7777778450e-03,
> - w3 = 7.9365057172e-04,
> - w4 = -5.9518753551e-04,
> - w5 = 8.3633989561e-04,
> - w6 = -1.6309292987e-03;
> - float t, y, z, nadj, p, p1, p2, p3, q, r, w;
> - int i, hx, ix;
> - nadj = 0;
> - hx = *(int *) (&x);
> - ix = hx & 0x7fffffff;
> - if (ix >= 0x7f800000)
> - return x * x;
> - if (ix == 0)
> - return INFINITY;
> - if (ix < 0x1c800000) {
> - if (hx < 0) {
> - return - native_log(-x);
> - } else
> - return - native_log(x);
> - }
> - if (hx < 0) {
> - if (ix >= 0x4b000000)
> - return INFINITY;
> - t = __gen_ocl_internal_sinpi(x);
> - if (__gen_ocl_fabs(t) < 1e-8f)
> - return INFINITY;
> - nadj = native_log(M_PI_F / __gen_ocl_fabs(t * x));
> - x = -x;
> - }
> -
> - if (ix == 0x3f800000 || ix == 0x40000000)
> - r = 0;
> - else if (ix < 0x40000000) {
> - if (ix <= 0x3f666666) {
> - r = - native_log(x);
> - if (ix >= 0x3f3b4a20) {
> - y = 1 - x;
> - i = 0;
> - } else if (ix >= 0x3e6d3308) {
> - y = x - (tc - 1);
> - i = 1;
> - } else {
> - y = x;
> - i = 2;
> - }
> - } else {
> - r = 0;
> - if (ix >= 0x3fdda618) {
> - y = 2 - x;
> - i = 0;
> - } else if (ix >= 0x3F9da620) {
> - y = x - tc;
> - i = 1;
> - } else {
> - y = x - 1;
> - i = 2;
> - }
> - }
> - switch (i) {
> - case 0:
> - z = y * y;
> - p1 = a0 + z * (a2 + z * (a4 + z * (a6 + z * (a8 + z * a10))));
> - p2 = z * (a1 + z * (a3 + z * (a5 + z * (a7 + z * (a9 + z * a11)))));
> - p = y * p1 + p2;
> - r += (p - .5f * y);
> - break;
> - case 1:
> - z = y * y;
> - w = z * y;
> - p1 = t0 + w * (t3 + w * (t6 + w * (t9 + w * t12)));
> - p2 = t1 + w * (t4 + w * (t7 + w * (t10 + w * t13)));
> - p3 = t2 + w * (t5 + w * (t8 + w * (t11 + w * t14)));
> - p = z * p1 - (tt - w * (p2 + y * p3));
> - r += (tf + p);
> - break;
> - case 2:
> - p1 = y * (u0 + y * (u1 + y * (u2 + y * (u3 + y * (u4 + y * u5)))));
> - p2 = 1 + y * (v1 + y * (v2 + y * (v3 + y * (v4 + y * v5))));
> - r += (-.5f * y + p1 / p2);
> - }
> - } else if (ix < 0x41000000) {
> - i = x;
> - t = 0;
> - y = x - i;
> - p = y*(s0+y*(s1+y*(s2+y*(s3+y*(s4+y*(s5+y*s6))))));
> - q = 1 + y * (r1 + y * (r2 + y * (r3 + y * (r4 + y * (r5 + y * r6)))));
> - r = .5f * y + p / q;
> - z = 1;
> - switch (i) {
> - case 7:
> - z *= (y + 6.f);
> - case 6:
> - z *= (y + 5.f);
> - case 5:
> - z *= (y + 4.f);
> - case 4:
> - z *= (y + 3.f);
> - case 3:
> - z *= (y + 2.f);
> - r += native_log(z);
> - break;
> - }
> - } else if (ix < 0x5c800000) {
> - t = native_log(x);
> - z = 1 / x;
> - y = z * z;
> - w = w0 + z * (w1 + y * (w2 + y * (w3 + y * (w4 + y * (w5 + y * w6)))));
> - r = (x - .5f) * (t - 1) + w;
> - } else
> - r = x * (native_log(x) - 1);
> - if (hx < 0)
> - r = nadj - r;
> - return r;
> -}
>
> INLINE_OVERLOADABLE float lgamma(float x) {
> /*
> @@ -2721,6 +2539,13 @@ INLINE_OVERLOADABLE float __gen_ocl_internal_exp(float x) {
> }
> }
>
> +INLINE_OVERLOADABLE float tgamma(float x) {
> + float y;
> + int s;
> + y=lgamma_r(x,&s);
> + return __gen_ocl_internal_exp(y)*s;
> +}
> +
> /* erf,erfc from glibc s_erff.c -- float version of s_erf.c.
> * Conversion to float by Ian Lance Taylor, Cygnus Support, ian at cygnus.com.
> */
> --
> 1.8.3.2
>
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