glibc/sysdeps/x86/fpu/sincosf_poly.h
Paul Eggert 5a82c74822 Prefer https to http for gnu.org and fsf.org URLs
Also, change sources.redhat.com to sourceware.org.
This patch was automatically generated by running the following shell
script, which uses GNU sed, and which avoids modifying files imported
from upstream:

sed -ri '
  s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g
  s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g
' \
  $(find $(git ls-files) -prune -type f \
      ! -name '*.po' \
      ! -name 'ChangeLog*' \
      ! -path COPYING ! -path COPYING.LIB \
      ! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \
      ! -path manual/texinfo.tex ! -path scripts/config.guess \
      ! -path scripts/config.sub ! -path scripts/install-sh \
      ! -path scripts/mkinstalldirs ! -path scripts/move-if-change \
      ! -path INSTALL ! -path  locale/programs/charmap-kw.h \
      ! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \
      ! '(' -name configure \
            -execdir test -f configure.ac -o -f configure.in ';' ')' \
      ! '(' -name preconfigure \
            -execdir test -f preconfigure.ac ';' ')' \
      -print)

and then by running 'make dist-prepare' to regenerate files built
from the altered files, and then executing the following to cleanup:

  chmod a+x sysdeps/unix/sysv/linux/riscv/configure
  # Omit irrelevant whitespace and comment-only changes,
  # perhaps from a slightly-different Autoconf version.
  git checkout -f \
    sysdeps/csky/configure \
    sysdeps/hppa/configure \
    sysdeps/riscv/configure \
    sysdeps/unix/sysv/linux/csky/configure
  # Omit changes that caused a pre-commit check to fail like this:
  # remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines
  git checkout -f \
    sysdeps/powerpc/powerpc64/ppc-mcount.S \
    sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
  # Omit change that caused a pre-commit check to fail like this:
  # remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline
  git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 02:43:31 -07:00

112 lines
3.1 KiB
C

/* Used by sinf, cosf and sincosf functions. X86-64 version.
Copyright (C) 2018-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
typedef double v2df_t __attribute__ ((vector_size (2 * sizeof (double))));
#ifdef __SSE2_MATH__
typedef float v4sf_t __attribute__ ((vector_size (4 * sizeof (float))));
static inline void
v2df_to_sf (v2df_t v2df, float *f0p, float *f1p)
{
v4sf_t v4sf = __builtin_ia32_cvtpd2ps (v2df);
*f0p = v4sf[0];
*f1p = v4sf[1];
}
#else
static inline void
v2df_to_sf (v2df_t v2df, float *f0p, float *f1p)
{
*f0p = (float) v2df[0];
*f1p = (float) v2df[1];
}
#endif
/* The constants and polynomials for sine and cosine. */
typedef struct
{
double sign[4]; /* Sign of sine in quadrants 0..3. */
double hpi_inv; /* 2 / PI ( * 2^24 if !TOINT_INTRINSICS). */
double hpi; /* PI / 2. */
/* Cosine polynomial: c0, c1, c2, c3, c4.
Sine polynomial: s1, s2, s3. */
double c0, c1;
v2df_t s1c2, s2c3, s3c4;
} sincos_t;
/* Compute the sine and cosine of inputs X and X2 (X squared), using the
polynomial P and store the results in SINP and COSP. N is the quadrant,
if odd the cosine and sine polynomials are swapped. */
static inline void
sincosf_poly (double x, double x2, const sincos_t *p, int n, float *sinp,
float *cosp)
{
v2df_t vx2x2 = { x2, x2 };
v2df_t vxx2 = { x, x2 };
v2df_t vx3x4, vs1c2;
vx3x4 = vx2x2 * vxx2;
vs1c2 = p->s2c3 + vx2x2 * p->s3c4;
/* Swap sin/cos result based on quadrant. */
if (n & 1)
{
float *tmp = cosp;
cosp = sinp;
sinp = tmp;
}
double c1 = p->c0 + x2 * p->c1;
v2df_t vxc1 = { x, c1 };
v2df_t vx5x6 = vx3x4 * vx2x2;
v2df_t vsincos = vxc1 + vx3x4 * p->s1c2;
vsincos = vsincos + vx5x6 * vs1c2;
v2df_to_sf (vsincos, sinp, cosp);
}
/* Return the sine of inputs X and X2 (X squared) using the polynomial P.
N is the quadrant, and if odd the cosine polynomial is used. */
static inline float
sinf_poly (double x, double x2, const sincos_t *p, int n)
{
double x3, x4, x6, x7, s, c, c1, c2, s1;
if ((n & 1) == 0)
{
x3 = x * x2;
s1 = p->s2c3[0] + x2 * p->s3c4[0];
x7 = x3 * x2;
s = x + x3 * p->s1c2[0];
return s + x7 * s1;
}
else
{
x4 = x2 * x2;
c2 = p->s2c3[1] + x2 * p->s3c4[1];
c1 = p->c0 + x2 * p->c1;
x6 = x4 * x2;
c = c1 + x4 * p->s1c2[1];
return c + x6 * c2;
}
}