diff options
Diffstat (limited to 'sysdeps/powerpc/fpu/k_rem_pio2f.c')
| -rw-r--r-- | sysdeps/powerpc/fpu/k_rem_pio2f.c | 273 |
1 files changed, 0 insertions, 273 deletions
diff --git a/sysdeps/powerpc/fpu/k_rem_pio2f.c b/sysdeps/powerpc/fpu/k_rem_pio2f.c deleted file mode 100644 index 7e5a08ba5a..0000000000 --- a/sysdeps/powerpc/fpu/k_rem_pio2f.c +++ /dev/null @@ -1,273 +0,0 @@ -/* k_rem_pio2f.c -- float version of e_rem_pio2.c - Copyright (C) 2011-2018 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Adhemerval Zanella <azanella@br.ibm.com>, 2011 - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Library General Public License as - published by the Free Software Foundation; either version 2 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Library General Public License for more details. - - You should have received a copy of the GNU Library General Public - License along with the GNU C Library; see the file COPYING.LIB. If - not, see <http://www.gnu.org/licenses/>. */ - -#include <math.h> - -#include <math_private.h> -#include "s_float_bitwise.h" - - -static const float two_over_pi[] = { - 1.62000000e+02, 2.49000000e+02, 1.31000000e+02, 1.10000000e+02, - 7.80000000e+01, 6.80000000e+01, 2.10000000e+01, 4.10000000e+01, - 2.52000000e+02, 3.90000000e+01, 8.70000000e+01, 2.09000000e+02, - 2.45000000e+02, 5.20000000e+01, 2.21000000e+02, 1.92000000e+02, - 2.19000000e+02, 9.80000000e+01, 1.49000000e+02, 1.53000000e+02, - 6.00000000e+01, 6.70000000e+01, 1.44000000e+02, 6.50000000e+01, - 2.54000000e+02, 8.10000000e+01, 9.90000000e+01, 1.71000000e+02, - 2.22000000e+02, 1.87000000e+02, 1.97000000e+02, 9.70000000e+01, - 1.83000000e+02, 3.60000000e+01, 1.10000000e+02, 5.80000000e+01, - 6.60000000e+01, 7.70000000e+01, 2.10000000e+02, 2.24000000e+02, - 6.00000000e+00, 7.30000000e+01, 4.60000000e+01, 2.34000000e+02, - 9.00000000e+00, 2.09000000e+02, 1.46000000e+02, 2.80000000e+01, - 2.54000000e+02, 2.90000000e+01, 2.35000000e+02, 2.80000000e+01, - 1.77000000e+02, 4.10000000e+01, 1.67000000e+02, 6.20000000e+01, - 2.32000000e+02, 1.30000000e+02, 5.30000000e+01, 2.45000000e+02, - 4.60000000e+01, 1.87000000e+02, 6.80000000e+01, 1.32000000e+02, - 2.33000000e+02, 1.56000000e+02, 1.12000000e+02, 3.80000000e+01, - 1.80000000e+02, 9.50000000e+01, 1.26000000e+02, 6.50000000e+01, - 5.70000000e+01, 1.45000000e+02, 2.14000000e+02, 5.70000000e+01, - 1.31000000e+02, 8.30000000e+01, 5.70000000e+01, 2.44000000e+02, - 1.56000000e+02, 1.32000000e+02, 9.50000000e+01, 1.39000000e+02, - 1.89000000e+02, 2.49000000e+02, 4.00000000e+01, 5.90000000e+01, - 3.10000000e+01, 2.48000000e+02, 1.51000000e+02, 2.55000000e+02, - 2.22000000e+02, 5.00000000e+00, 1.52000000e+02, 1.50000000e+01, - 2.39000000e+02, 4.70000000e+01, 1.70000000e+01, 1.39000000e+02, - 9.00000000e+01, 1.00000000e+01, 1.09000000e+02, 3.10000000e+01, - 1.09000000e+02, 5.40000000e+01, 1.26000000e+02, 2.07000000e+02, - 3.90000000e+01, 2.03000000e+02, 9.00000000e+00, 1.83000000e+02, - 7.90000000e+01, 7.00000000e+01, 6.30000000e+01, 1.02000000e+02, - 1.58000000e+02, 9.50000000e+01, 2.34000000e+02, 4.50000000e+01, - 1.17000000e+02, 3.90000000e+01, 1.86000000e+02, 1.99000000e+02, - 2.35000000e+02, 2.29000000e+02, 2.41000000e+02, 1.23000000e+02, - 6.10000000e+01, 7.00000000e+00, 5.70000000e+01, 2.47000000e+02, - 1.38000000e+02, 8.20000000e+01, 1.46000000e+02, 2.34000000e+02, - 1.07000000e+02, 2.51000000e+02, 9.50000000e+01, 1.77000000e+02, - 3.10000000e+01, 1.41000000e+02, 9.30000000e+01, 8.00000000e+00, - 8.60000000e+01, 3.00000000e+00, 4.80000000e+01, 7.00000000e+01, - 2.52000000e+02, 1.23000000e+02, 1.07000000e+02, 1.71000000e+02, - 2.40000000e+02, 2.07000000e+02, 1.88000000e+02, 3.20000000e+01, - 1.54000000e+02, 2.44000000e+02, 5.40000000e+01, 2.90000000e+01, - 1.69000000e+02, 2.27000000e+02, 1.45000000e+02, 9.70000000e+01, - 9.40000000e+01, 2.30000000e+02, 2.70000000e+01, 8.00000000e+00, - 1.01000000e+02, 1.53000000e+02, 1.33000000e+02, 9.50000000e+01, - 2.00000000e+01, 1.60000000e+02, 1.04000000e+02, 6.40000000e+01, - 1.41000000e+02, 2.55000000e+02, 2.16000000e+02, 1.28000000e+02, - 7.70000000e+01, 1.15000000e+02, 3.90000000e+01, 4.90000000e+01, - 6.00000000e+00, 6.00000000e+00, 2.10000000e+01, 8.60000000e+01, - 2.02000000e+02, 1.15000000e+02, 1.68000000e+02, 2.01000000e+02, - 9.60000000e+01, 2.26000000e+02, 1.23000000e+02, 1.92000000e+02, - 1.40000000e+02, 1.07000000e+02 -}; - - -static const float PIo2[] = { - 1.5703125000e+00, /* 0x3fc90000 */ - 4.5776367188e-04, /* 0x39f00000 */ - 2.5987625122e-05, /* 0x37da0000 */ - 7.5437128544e-08, /* 0x33a20000 */ - 6.0026650317e-11, /* 0x2e840000 */ - 7.3896444519e-13, /* 0x2b500000 */ - 5.3845816694e-15, /* 0x27c20000 */ - 5.6378512969e-18, /* 0x22d00000 */ - 8.3009228831e-20, /* 0x1fc40000 */ - 3.2756352257e-22, /* 0x1bc60000 */ - 6.3331015649e-25, /* 0x17440000 */ -}; - - -static const float zero = 0.0000000000e+00; -static const float one = 1.0000000000; -static const float twon8 = 3.9062500000e-03; -static const float two8 = 2.5600000000e+02; - - -int32_t -__fp_kernel_rem_pio2f (float *x, float *y, float e0, int32_t nx) -{ - int32_t jz, jx, jv, jp, jk, carry, n, iq[20], i, j, k, m, q0, ih, exp; - float z, fw, f[20], fq[20], q[20]; - - /* initialize jk */ - jp = jk = 9; - - /* determine jx,jv,q0, note that 3>q0 */ - jx = nx - 1; - exp = __float_get_exp (e0) - 127; - jv = (exp - 3) / 8; - if (jv < 0) - jv = 0; - q0 = exp - 8 * (jv + 1); - - /* set up f[0] to f[jx+jk] where f[jx+jk] = two_over_pi[jv+jk] */ - j = jv - jx; - m = jx + jk; - for (i = 0; i <= m; i++, j++) - f[i] = (j < 0) ? zero : two_over_pi[j]; - - /* compute q[0],q[1],...q[jk] */ - for (i = 0; i <= jk; i++) - { - for (j = 0, fw = 0.0; j <= jx; j++) - fw += x[j] * f[jx + i - j]; - q[i] = fw; - } - - jz = jk; -recompute: - /* distill q[] into iq[] reversingly */ - for (i = 0, j = jz, z = q[jz]; j > 0; i++, j--) - { - fw = __truncf (twon8 * z); - iq[i] = (int32_t) (z - two8 * fw); - z = q[j - 1] + fw; - } - - /* compute n */ - z = __scalbnf (z, q0); /* actual value of z */ - z -= 8.0 * __floorf (z * 0.125); /* trim off integer >= 8 */ - n = (int32_t) z; - z -= __truncf (z); - ih = 0; - if (q0 > 0) - { /* need iq[jz-1] to determine n */ - i = (iq[jz - 1] >> (8 - q0)); - n += i; - iq[jz - 1] -= i << (8 - q0); - ih = iq[jz - 1] >> (7 - q0); - } - else if (q0 == 0) - ih = iq[jz - 1] >> 7; - else if (z >= 0.5) - ih = 2; - - if (ih > 0) - { /* q > 0.5 */ - n += 1; - carry = 0; - for (i = 0; i < jz; i++) - { /* compute 1-q */ - j = iq[i]; - if (carry == 0) - { - if (j != 0) - { - carry = 1; - iq[i] = 0x100 - j; - } - } - else - iq[i] = 0xff - j; - } - if (q0 > 0) - { /* rare case: chance is 1 in 12 */ - switch (q0) - { - case 1: - iq[jz - 1] &= 0x7f; - break; - case 2: - iq[jz - 1] &= 0x3f; - break; - } - } - if (ih == 2) - { - z = one - z; - if (carry != 0) - z -= __scalbnf (one, q0); - } - } - - /* check if recomputation is needed */ - if (z == zero) - { - j = 0; - for (i = jz - 1; i >= jk; i--) - j |= iq[i]; - if (j == 0) - { /* need recomputation */ - for (k = 1; iq[jk - k] == 0; k++); /* k = no. of terms needed */ - - for (i = jz + 1; i <= jz + k; i++) - { /* add q[jz+1] to q[jz+k] */ - f[jx + i] = two_over_pi[jv + i]; - for (j = 0, fw = 0.0; j <= jx; j++) - fw += x[j] * f[jx + i - j]; - q[i] = fw; - } - jz += k; - goto recompute; - } - } - - /* chop off zero terms */ - if (z == 0.0) - { - jz -= 1; - q0 -= 8; - while (iq[jz] == 0) - { - jz--; - q0 -= 8; - } - } - else - { /* break z into 8-bit if necessary */ - z = __scalbnf (z, -q0); - if (z >= two8) - { - fw = __truncf (twon8 * z); - iq[jz] = (int32_t) (z - two8 * fw); - jz += 1; - q0 += 8; - iq[jz] = (int32_t) fw; - } - else - iq[jz] = (int32_t) z; - } - - /* convert integer "bit" chunk to floating-point value */ - fw = __scalbnf (one, q0); - for (i = jz; i >= 0; i--) - { - q[i] = fw * (float) iq[i]; - fw *= twon8; - } - - /* compute PIo2[0,...,jp]*q[jz,...,0] */ - for (i = jz; i >= 0; i--) - { - for (fw = 0.0, k = 0; k <= jp && k <= jz - i; k++) - fw += PIo2[k] * q[i + k]; - fq[jz - i] = fw; - } - - /* compress fq[] into y[] */ - fw = 0.0; - for (i = jz; i >= 0; i--) - fw += fq[i]; - y[0] = (ih == 0) ? fw : -fw; - fw = fq[0] - fw; - for (i = 1; i <= jz; i++) - fw += fq[i]; - y[1] = (ih == 0) ? fw : -fw; - - return n & 7; -} |