Major new features:
-* Start of implementing vector math library libmvec on PPC64/POWER8.
- The double-precision cosine now has a vector version.
+* Implementation of vector math library libmvec on PPC64/POWER8.
+
+ The following functions now have vector versions.
+ - double-precision cosine: cos
+ - single-precision cosine: cosf
+
GCC support for auto-vectorization of functions on PPC64 is not yet
available. Until that is done, the new vector math functions are
inaccessible to applications.
+
Library libmvec is built by default for PPC64. Disable its creation by
passing flag --disable-mathvec to configure.
+
The library ABI specification is x86_64 Vector Function ABI.
More information on libmvec including a link to the ABI document is at:
<https://sourceware.org/glibc/wiki/libmvec>
Function: "cos_vlen2":
double: 2
+Function: "cos_vlen4":
+float: 1
+
Function: "cosh":
double: 1
float: 1
libmvec {
GLIBC_2.30 {
- _ZGVbN2v_cos;
+ _ZGVbN2v_cos; _ZGVbN4v_cosf;
}
}
ifeq ($(subdir),mathvec)
-libmvec-sysdep_routines += vec_d_cos2_vsx
+libmvec-sysdep_routines += vec_d_cos2_vsx vec_s_cosf4_vsx
CFLAGS-vec_d_cos2_vsx.c += -mabi=altivec -maltivec -mvsx
+CFLAGS-vec_s_cosf4_vsx.c += -mabi=altivec -maltivec -mvsx
endif
# Variables for libmvec tests.
ifeq ($(subdir),math)
ifeq ($(build-mathvec),yes)
-libmvec-tests += double-vlen2
+libmvec-tests += double-vlen2 float-vlen4
double-vlen2-funcs = cos
+float-vlen4-funcs = cos
double-vlen2-arch-ext-cflags = -mabi=altivec -maltivec -mvsx -DREQUIRE_VSX
+float-vlen4-arch-ext-cflags = -mabi=altivec -maltivec -mvsx -DREQUIRE_VSX
+
CFLAGS-test-double-vlen2-wrappers.c += -mabi=altivec -maltivec -mvsx -DREQUIRE_VSX
+CFLAGS-test-float-vlen4-wrappers.c += -mabi=altivec -maltivec -mvsx -DREQUIRE_VSX
+
endif
endif
--- /dev/null
+/* Wrapper part of tests for VSX ISA versions of vector math functions.
+ Copyright (C) 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
+ <http://www.gnu.org/licenses/>. */
+
+#include "test-float-vlen4.h"
+#include <altivec.h>
+
+#define VEC_TYPE vector float
+
+VECTOR_WRAPPER (WRAPPER_NAME (cosf), _ZGVbN4v_cosf)
--- /dev/null
+/* Function cosf vectorized with VSX.
+ Copyright (C) 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
+ <http://www.gnu.org/licenses/>. */
+
+#include <math.h>
+#include "vec_s_trig_data.h"
+
+vector float
+_ZGVbN4v_cosf (vector float x)
+{
+
+ /*
+ ALGORITHM DESCRIPTION:
+
+ 1) Range reduction to [-Pi/2; +Pi/2] interval
+ a) We remove sign using absolute value operation
+ b) Add Pi/2 value to argument X for Cos to Sin transformation
+ c) Getting octant Y by 1/Pi multiplication
+ d) Add "Right Shifter" value
+ e) Treat obtained value as integer for destination sign setting.
+ Shift first bit of this value to the last (sign) position
+ f) Subtract "Right Shifter" value
+ g) Subtract 0.5 from result for octant correction
+ h) Subtract Y*PI from X argument, where PI divided to 4 parts:
+ X = X - Y*PI1 - Y*PI2 - Y*PI3 - Y*PI4;
+ 2) Polynomial (minimax for sin within [-Pi/2; +Pi/2] interval)
+ a) Calculate X^2 = X * X
+ b) Calculate polynomial:
+ R = X + X * X^2 * (A3 + x^2 * (A5 + .....
+ 3) Destination sign setting
+ a) Set shifted destination sign using XOR operation:
+ R = XOR( R, S ). */
+
+ /*
+ ARGUMENT RANGE REDUCTION:
+ Add Pi/2 to argument: X' = X+Pi/2. Transforms cos to sin. */
+ vector float x_prime = __s_half_pi + x;
+
+ /* Y = X'*InvPi + RS : right shifter add. */
+ vector float y = (x_prime * __s_inv_pi) + __s_rshifter;
+
+ /* N = Y - RS : right shifter sub. */
+ vector float n = y - __s_rshifter;
+
+ /* SignRes = Y<<31 : shift LSB to MSB place for result sign. */
+ vector float sign_res = (vector float)
+ vec_sl ((vector signed int) y, (vector unsigned int) vec_splats (31));
+
+ /* N = N - 0.5. */
+ n = n - __s_one_half;
+
+ /* Get absolute argument value: X = |X|. */
+ vector float abs_x = vec_abs (x);
+
+ /* Check for large arguments path. */
+ vector bool int large_in = vec_cmpgt (abs_x, __s_rangeval);
+
+ /* R = X - N*Pi1. */
+ vector float r = x - (n * __s_pi1_fma);
+
+ /* R = R - N*Pi2. */
+ r = r - (n * __s_pi2_fma);
+
+ /* R = R - N*Pi3. */
+ r = r - (n * __s_pi3_fma);
+
+ /* R2 = R*R. */
+ vector float r2 = r * r;
+
+ /* RECONSTRUCTION:
+ Final sign setting: Res = Poly^SignRes. */
+ vector float res = (vector float)
+ ((vector signed int) r ^ (vector signed int) sign_res);
+
+ /* Poly = R + R * R2*(A3+R2*(A5+R2*(A7+R2*A9))). */
+ vector float poly = r2 * __s_a9_fma + __s_a7_fma;
+ poly = poly * r2 + __s_a5_fma;
+ poly = poly * r2 + __s_a3;
+ poly = poly * r2 * res + res;
+
+ if (large_in[0])
+ poly[0] = cosf (x[0]);
+
+ if (large_in[1])
+ poly[1] = cosf (x[1]);
+
+ if (large_in[2])
+ poly[2] = cosf (x[2]);
+
+ if (large_in[3])
+ poly[3] = cosf (x[3]);
+
+ return poly;
+
+} /* Function _ZGVbN4v_cosf. */
--- /dev/null
+/* Constants used in polynomial approximations for vectorized sinf, cosf,
+ and sincosf functions.
+ Copyright (C) 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
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef S_TRIG_DATA_H
+#define S_TRIG_DATA_H
+
+#include <altivec.h>
+
+/* PI/2. */
+const vector float __s_half_pi =
+{ 0x1.921fb6p+0, 0x1.921fb6p+0, 0x1.921fb6p+0, 0x1.921fb6p+0 };
+
+/* Inverse PI. */
+const vector float __s_inv_pi =
+{ 0x1.45f306p-2, 0x1.45f306p-2, 0x1.45f306p-2, 0x1.45f306p-2 };
+
+/* Right-shifter constant. */
+const vector float __s_rshifter =
+{ 0x1.8p+23, 0x1.8p+23, 0x1.8p+23, 0x1.8p+23 };
+
+/* One-half. */
+const vector float __s_one_half =
+{ 0x1p-1, 0x1p-1, 0x1p-1, 0x1p-1 };
+
+/* Threshold for out-of-range values. */
+const vector float __s_rangeval =
+{ 0x1.388p+13, 0x1.388p+13, 0x1.388p+13, 0x1.388p+13 };
+
+/* PI1, PI2, and PI3 when FMA is available
+ PI high part (when FMA available). */
+const vector float __s_pi1_fma =
+{ 0x1.921fb6p+1, 0x1.921fb6p+1, 0x1.921fb6p+1, 0x1.921fb6p+1 };
+
+/* PI mid part (when FMA available). */
+const vector float __s_pi2_fma =
+{ -0x1.777a5cp-24, -0x1.777a5cp-24, -0x1.777a5cp-24, -0x1.777a5cp-24 };
+
+/* PI low part (when FMA available). */
+const vector float __s_pi3_fma =
+{ -0x1.ee59dap-49, -0x1.ee59dap-49, -0x1.ee59dap-49, -0x1.ee59dap-49 };
+
+/* Polynomial constants for work w/o FMA, relative error ~ 2^(-26.625). */
+const vector float __s_a3 =
+{ -0x1.55554cp-3, -0x1.55554cp-3, -0x1.55554cp-3, -0x1.55554cp-3 };
+
+/* Polynomial constants, work with FMA, relative error ~ 2^(-26.417). */
+const vector float __s_a5_fma =
+{ 0x1.110edp-7, 0x1.110edp-7, 0x1.110edp-7, 0x1.110edp-7 };
+
+const vector float __s_a7_fma =
+{ -0x1.9f6d9ep-13, -0x1.9f6d9ep-13, -0x1.9f6d9ep-13, -0x1.9f6d9ep-13 };
+
+const vector float __s_a9_fma =
+{ 0x1.5d866ap-19, 0x1.5d866ap-19, 0x1.5d866ap-19, 0x1.5d866ap-19 };
+
+#endif /* S_TRIG_DATA_H. */
GLIBC_2.30 _ZGVbN2v_cos F
+GLIBC_2.30 _ZGVbN4v_cosf F
projects / thirdparty / glibc.git / commitdiff
