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glibc/soft-fp/op-2.h
Siddhesh Poyarekar 30891f35fa Remove "Contributed by" lines 
We stopped adding "Contributed by" or similar lines in sources in 2012
in favour of git logs and keeping the Contributors section of the
glibc manual up to date.  Removing these lines makes the license
header a bit more consistent across files and also removes the
possibility of error in attribution when license blocks or files are
copied across since the contributed-by lines don't actually reflect
reality in those cases.

Move all "Contributed by" and similar lines (Written by, Test by,
etc.) into a new file CONTRIBUTED-BY to retain record of these
contributions.  These contributors are also mentioned in
manual/contrib.texi, so we just maintain this additional record as a
courtesy to the earlier developers.

The following scripts were used to filter a list of files to edit in
place and to clean up the CONTRIBUTED-BY file respectively.  These
were not added to the glibc sources because they're not expected to be
of any use in future given that this is a one time task:

https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc
https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
2021-09-03 22:06:44 +05:30

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/* Software floating-point emulation.
Basic two-word fraction declaration and manipulation.
Copyright (C) 1997-2021 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.
In addition to the permissions in the GNU Lesser General Public
License, the Free Software Foundation gives you unlimited
permission to link the compiled version of this file into
combinations with other programs, and to distribute those
combinations without any restriction coming from the use of this
file. (The Lesser General Public License restrictions do apply in
other respects; for example, they cover modification of the file,
and distribution when not linked into a combine executable.)
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/>. */
#ifndef SOFT_FP_OP_2_H
#define SOFT_FP_OP_2_H 1
#define _FP_FRAC_DECL_2(X) \
_FP_W_TYPE X##_f0 _FP_ZERO_INIT, X##_f1 _FP_ZERO_INIT
#define _FP_FRAC_COPY_2(D, S) (D##_f0 = S##_f0, D##_f1 = S##_f1)
#define _FP_FRAC_SET_2(X, I) __FP_FRAC_SET_2 (X, I)
#define _FP_FRAC_HIGH_2(X) (X##_f1)
#define _FP_FRAC_LOW_2(X) (X##_f0)
#define _FP_FRAC_WORD_2(X, w) (X##_f##w)
#define _FP_FRAC_SLL_2(X, N) \
(void) (((N) < _FP_W_TYPE_SIZE) \
? ({ \
if (__builtin_constant_p (N) && (N) == 1) \
{ \
X##_f1 = X##_f1 + X##_f1 + (((_FP_WS_TYPE) (X##_f0)) < 0); \
X##_f0 += X##_f0; \
} \
else \
{ \
X##_f1 = X##_f1 << (N) | X##_f0 >> (_FP_W_TYPE_SIZE - (N)); \
X##_f0 <<= (N); \
} \
0; \
}) \
: ({ \
X##_f1 = X##_f0 << ((N) - _FP_W_TYPE_SIZE); \
X##_f0 = 0; \
}))
#define _FP_FRAC_SRL_2(X, N) \
(void) (((N) < _FP_W_TYPE_SIZE) \
? ({ \
X##_f0 = X##_f0 >> (N) | X##_f1 << (_FP_W_TYPE_SIZE - (N)); \
X##_f1 >>= (N); \
}) \
: ({ \
X##_f0 = X##_f1 >> ((N) - _FP_W_TYPE_SIZE); \
X##_f1 = 0; \
}))
/* Right shift with sticky-lsb. */
#define _FP_FRAC_SRST_2(X, S, N, sz) \
(void) (((N) < _FP_W_TYPE_SIZE) \
? ({ \
S = (__builtin_constant_p (N) && (N) == 1 \
? X##_f0 & 1 \
: (X##_f0 << (_FP_W_TYPE_SIZE - (N))) != 0); \
X##_f0 = (X##_f1 << (_FP_W_TYPE_SIZE - (N)) | X##_f0 >> (N)); \
X##_f1 >>= (N); \
}) \
: ({ \
S = ((((N) == _FP_W_TYPE_SIZE \
? 0 \
: (X##_f1 << (2*_FP_W_TYPE_SIZE - (N)))) \
| X##_f0) != 0); \
X##_f0 = (X##_f1 >> ((N) - _FP_W_TYPE_SIZE)); \
X##_f1 = 0; \
}))
#define _FP_FRAC_SRS_2(X, N, sz) \
(void) (((N) < _FP_W_TYPE_SIZE) \
? ({ \
X##_f0 = (X##_f1 << (_FP_W_TYPE_SIZE - (N)) | X##_f0 >> (N) \
| (__builtin_constant_p (N) && (N) == 1 \
? X##_f0 & 1 \
: (X##_f0 << (_FP_W_TYPE_SIZE - (N))) != 0)); \
X##_f1 >>= (N); \
}) \
: ({ \
X##_f0 = (X##_f1 >> ((N) - _FP_W_TYPE_SIZE) \
| ((((N) == _FP_W_TYPE_SIZE \
? 0 \
: (X##_f1 << (2*_FP_W_TYPE_SIZE - (N)))) \
| X##_f0) != 0)); \
X##_f1 = 0; \
}))
#define _FP_FRAC_ADDI_2(X, I) \
__FP_FRAC_ADDI_2 (X##_f1, X##_f0, I)
#define _FP_FRAC_ADD_2(R, X, Y) \
__FP_FRAC_ADD_2 (R##_f1, R##_f0, X##_f1, X##_f0, Y##_f1, Y##_f0)
#define _FP_FRAC_SUB_2(R, X, Y) \
__FP_FRAC_SUB_2 (R##_f1, R##_f0, X##_f1, X##_f0, Y##_f1, Y##_f0)
#define _FP_FRAC_DEC_2(X, Y) \
__FP_FRAC_DEC_2 (X##_f1, X##_f0, Y##_f1, Y##_f0)
#define _FP_FRAC_CLZ_2(R, X) \
do \
{ \
if (X##_f1) \
__FP_CLZ ((R), X##_f1); \
else \
{ \
__FP_CLZ ((R), X##_f0); \
(R) += _FP_W_TYPE_SIZE; \
} \
} \
while (0)
/* Predicates. */
#define _FP_FRAC_NEGP_2(X) ((_FP_WS_TYPE) X##_f1 < 0)
#define _FP_FRAC_ZEROP_2(X) ((X##_f1 | X##_f0) == 0)
#define _FP_FRAC_OVERP_2(fs, X) (_FP_FRAC_HIGH_##fs (X) & _FP_OVERFLOW_##fs)
#define _FP_FRAC_CLEAR_OVERP_2(fs, X) (_FP_FRAC_HIGH_##fs (X) &= ~_FP_OVERFLOW_##fs)
#define _FP_FRAC_HIGHBIT_DW_2(fs, X) \
(_FP_FRAC_HIGH_DW_##fs (X) & _FP_HIGHBIT_DW_##fs)
#define _FP_FRAC_EQ_2(X, Y) (X##_f1 == Y##_f1 && X##_f0 == Y##_f0)
#define _FP_FRAC_GT_2(X, Y) \
(X##_f1 > Y##_f1 || (X##_f1 == Y##_f1 && X##_f0 > Y##_f0))
#define _FP_FRAC_GE_2(X, Y) \
(X##_f1 > Y##_f1 || (X##_f1 == Y##_f1 && X##_f0 >= Y##_f0))
#define _FP_ZEROFRAC_2 0, 0
#define _FP_MINFRAC_2 0, 1
#define _FP_MAXFRAC_2 (~(_FP_WS_TYPE) 0), (~(_FP_WS_TYPE) 0)
/* Internals. */
#define __FP_FRAC_SET_2(X, I1, I0) (X##_f0 = I0, X##_f1 = I1)
#define __FP_CLZ_2(R, xh, xl) \
do \
{ \
if (xh) \
__FP_CLZ ((R), xh); \
else \
{ \
__FP_CLZ ((R), xl); \
(R) += _FP_W_TYPE_SIZE; \
} \
} \
while (0)
#if 0
# ifndef __FP_FRAC_ADDI_2
# define __FP_FRAC_ADDI_2(xh, xl, i) \
(xh += ((xl += i) < i))
# endif
# ifndef __FP_FRAC_ADD_2
# define __FP_FRAC_ADD_2(rh, rl, xh, xl, yh, yl) \
(rh = xh + yh + ((rl = xl + yl) < xl))
# endif
# ifndef __FP_FRAC_SUB_2
# define __FP_FRAC_SUB_2(rh, rl, xh, xl, yh, yl) \
(rh = xh - yh - ((rl = xl - yl) > xl))
# endif
# ifndef __FP_FRAC_DEC_2
# define __FP_FRAC_DEC_2(xh, xl, yh, yl) \
do \
{ \
UWtype __FP_FRAC_DEC_2_t = xl; \
xh -= yh + ((xl -= yl) > __FP_FRAC_DEC_2_t); \
} \
while (0)
# endif
#else
# undef __FP_FRAC_ADDI_2
# define __FP_FRAC_ADDI_2(xh, xl, i) add_ssaaaa (xh, xl, xh, xl, 0, i)
# undef __FP_FRAC_ADD_2
# define __FP_FRAC_ADD_2 add_ssaaaa
# undef __FP_FRAC_SUB_2
# define __FP_FRAC_SUB_2 sub_ddmmss
# undef __FP_FRAC_DEC_2
# define __FP_FRAC_DEC_2(xh, xl, yh, yl) \
sub_ddmmss (xh, xl, xh, xl, yh, yl)
#endif
/* Unpack the raw bits of a native fp value. Do not classify or
normalize the data. */
#define _FP_UNPACK_RAW_2(fs, X, val) \
do \
{ \
union _FP_UNION_##fs _FP_UNPACK_RAW_2_flo; \
_FP_UNPACK_RAW_2_flo.flt = (val); \
\
X##_f0 = _FP_UNPACK_RAW_2_flo.bits.frac0; \
X##_f1 = _FP_UNPACK_RAW_2_flo.bits.frac1; \
X##_e = _FP_UNPACK_RAW_2_flo.bits.exp; \
X##_s = _FP_UNPACK_RAW_2_flo.bits.sign; \
} \
while (0)
#define _FP_UNPACK_RAW_2_P(fs, X, val) \
do \
{ \
union _FP_UNION_##fs *_FP_UNPACK_RAW_2_P_flo \
= (union _FP_UNION_##fs *) (val); \
\
X##_f0 = _FP_UNPACK_RAW_2_P_flo->bits.frac0; \
X##_f1 = _FP_UNPACK_RAW_2_P_flo->bits.frac1; \
X##_e = _FP_UNPACK_RAW_2_P_flo->bits.exp; \
X##_s = _FP_UNPACK_RAW_2_P_flo->bits.sign; \
} \
while (0)
/* Repack the raw bits of a native fp value. */
#define _FP_PACK_RAW_2(fs, val, X) \
do \
{ \
union _FP_UNION_##fs _FP_PACK_RAW_2_flo; \
\
_FP_PACK_RAW_2_flo.bits.frac0 = X##_f0; \
_FP_PACK_RAW_2_flo.bits.frac1 = X##_f1; \
_FP_PACK_RAW_2_flo.bits.exp = X##_e; \
_FP_PACK_RAW_2_flo.bits.sign = X##_s; \
\
(val) = _FP_PACK_RAW_2_flo.flt; \
} \
while (0)
#define _FP_PACK_RAW_2_P(fs, val, X) \
do \
{ \
union _FP_UNION_##fs *_FP_PACK_RAW_2_P_flo \
= (union _FP_UNION_##fs *) (val); \
\
_FP_PACK_RAW_2_P_flo->bits.frac0 = X##_f0; \
_FP_PACK_RAW_2_P_flo->bits.frac1 = X##_f1; \
_FP_PACK_RAW_2_P_flo->bits.exp = X##_e; \
_FP_PACK_RAW_2_P_flo->bits.sign = X##_s; \
} \
while (0)
/* Multiplication algorithms: */
/* Given a 1W * 1W => 2W primitive, do the extended multiplication. */
#define _FP_MUL_MEAT_DW_2_wide(wfracbits, R, X, Y, doit) \
do \
{ \
_FP_FRAC_DECL_2 (_FP_MUL_MEAT_DW_2_wide_b); \
_FP_FRAC_DECL_2 (_FP_MUL_MEAT_DW_2_wide_c); \
\
doit (_FP_FRAC_WORD_4 (R, 1), _FP_FRAC_WORD_4 (R, 0), \
X##_f0, Y##_f0); \
doit (_FP_MUL_MEAT_DW_2_wide_b_f1, _FP_MUL_MEAT_DW_2_wide_b_f0, \
X##_f0, Y##_f1); \
doit (_FP_MUL_MEAT_DW_2_wide_c_f1, _FP_MUL_MEAT_DW_2_wide_c_f0, \
X##_f1, Y##_f0); \
doit (_FP_FRAC_WORD_4 (R, 3), _FP_FRAC_WORD_4 (R, 2), \
X##_f1, Y##_f1); \
\
__FP_FRAC_ADD_3 (_FP_FRAC_WORD_4 (R, 3), _FP_FRAC_WORD_4 (R, 2), \
_FP_FRAC_WORD_4 (R, 1), 0, \
_FP_MUL_MEAT_DW_2_wide_b_f1, \
_FP_MUL_MEAT_DW_2_wide_b_f0, \
_FP_FRAC_WORD_4 (R, 3), _FP_FRAC_WORD_4 (R, 2), \
_FP_FRAC_WORD_4 (R, 1)); \
__FP_FRAC_ADD_3 (_FP_FRAC_WORD_4 (R, 3), _FP_FRAC_WORD_4 (R, 2), \
_FP_FRAC_WORD_4 (R, 1), 0, \
_FP_MUL_MEAT_DW_2_wide_c_f1, \
_FP_MUL_MEAT_DW_2_wide_c_f0, \
_FP_FRAC_WORD_4 (R, 3), _FP_FRAC_WORD_4 (R, 2), \
_FP_FRAC_WORD_4 (R, 1)); \
} \
while (0)
#define _FP_MUL_MEAT_2_wide(wfracbits, R, X, Y, doit) \
do \
{ \
_FP_FRAC_DECL_4 (_FP_MUL_MEAT_2_wide_z); \
\
_FP_MUL_MEAT_DW_2_wide ((wfracbits), _FP_MUL_MEAT_2_wide_z, \
X, Y, doit); \
\
/* Normalize since we know where the msb of the multiplicands \
were (bit B), we know that the msb of the of the product is \
at either 2B or 2B-1. */ \
_FP_FRAC_SRS_4 (_FP_MUL_MEAT_2_wide_z, (wfracbits)-1, \
2*(wfracbits)); \
R##_f0 = _FP_FRAC_WORD_4 (_FP_MUL_MEAT_2_wide_z, 0); \
R##_f1 = _FP_FRAC_WORD_4 (_FP_MUL_MEAT_2_wide_z, 1); \
} \
while (0)
/* Given a 1W * 1W => 2W primitive, do the extended multiplication.
Do only 3 multiplications instead of four. This one is for machines
where multiplication is much more expensive than subtraction. */
#define _FP_MUL_MEAT_DW_2_wide_3mul(wfracbits, R, X, Y, doit) \
do \
{ \
_FP_FRAC_DECL_2 (_FP_MUL_MEAT_DW_2_wide_3mul_b); \
_FP_FRAC_DECL_2 (_FP_MUL_MEAT_DW_2_wide_3mul_c); \
_FP_W_TYPE _FP_MUL_MEAT_DW_2_wide_3mul_d; \
int _FP_MUL_MEAT_DW_2_wide_3mul_c1; \
int _FP_MUL_MEAT_DW_2_wide_3mul_c2; \
\
_FP_MUL_MEAT_DW_2_wide_3mul_b_f0 = X##_f0 + X##_f1; \
_FP_MUL_MEAT_DW_2_wide_3mul_c1 \
= _FP_MUL_MEAT_DW_2_wide_3mul_b_f0 < X##_f0; \
_FP_MUL_MEAT_DW_2_wide_3mul_b_f1 = Y##_f0 + Y##_f1; \
_FP_MUL_MEAT_DW_2_wide_3mul_c2 \
= _FP_MUL_MEAT_DW_2_wide_3mul_b_f1 < Y##_f0; \
doit (_FP_MUL_MEAT_DW_2_wide_3mul_d, _FP_FRAC_WORD_4 (R, 0), \
X##_f0, Y##_f0); \
doit (_FP_FRAC_WORD_4 (R, 2), _FP_FRAC_WORD_4 (R, 1), \
_FP_MUL_MEAT_DW_2_wide_3mul_b_f0, \
_FP_MUL_MEAT_DW_2_wide_3mul_b_f1); \
doit (_FP_MUL_MEAT_DW_2_wide_3mul_c_f1, \
_FP_MUL_MEAT_DW_2_wide_3mul_c_f0, X##_f1, Y##_f1); \
\
_FP_MUL_MEAT_DW_2_wide_3mul_b_f0 \
&= -_FP_MUL_MEAT_DW_2_wide_3mul_c2; \
_FP_MUL_MEAT_DW_2_wide_3mul_b_f1 \
&= -_FP_MUL_MEAT_DW_2_wide_3mul_c1; \
__FP_FRAC_ADD_3 (_FP_FRAC_WORD_4 (R, 3), _FP_FRAC_WORD_4 (R, 2), \
_FP_FRAC_WORD_4 (R, 1), \
(_FP_MUL_MEAT_DW_2_wide_3mul_c1 \
& _FP_MUL_MEAT_DW_2_wide_3mul_c2), 0, \
_FP_MUL_MEAT_DW_2_wide_3mul_d, \
0, _FP_FRAC_WORD_4 (R, 2), _FP_FRAC_WORD_4 (R, 1)); \
__FP_FRAC_ADDI_2 (_FP_FRAC_WORD_4 (R, 3), _FP_FRAC_WORD_4 (R, 2), \
_FP_MUL_MEAT_DW_2_wide_3mul_b_f0); \
__FP_FRAC_ADDI_2 (_FP_FRAC_WORD_4 (R, 3), _FP_FRAC_WORD_4 (R, 2), \
_FP_MUL_MEAT_DW_2_wide_3mul_b_f1); \
__FP_FRAC_DEC_3 (_FP_FRAC_WORD_4 (R, 3), _FP_FRAC_WORD_4 (R, 2), \
_FP_FRAC_WORD_4 (R, 1), \
0, _FP_MUL_MEAT_DW_2_wide_3mul_d, \
_FP_FRAC_WORD_4 (R, 0)); \
__FP_FRAC_DEC_3 (_FP_FRAC_WORD_4 (R, 3), _FP_FRAC_WORD_4 (R, 2), \
_FP_FRAC_WORD_4 (R, 1), 0, \
_FP_MUL_MEAT_DW_2_wide_3mul_c_f1, \
_FP_MUL_MEAT_DW_2_wide_3mul_c_f0); \
__FP_FRAC_ADD_2 (_FP_FRAC_WORD_4 (R, 3), _FP_FRAC_WORD_4 (R, 2), \
_FP_MUL_MEAT_DW_2_wide_3mul_c_f1, \
_FP_MUL_MEAT_DW_2_wide_3mul_c_f0, \
_FP_FRAC_WORD_4 (R, 3), _FP_FRAC_WORD_4 (R, 2)); \
} \
while (0)
#define _FP_MUL_MEAT_2_wide_3mul(wfracbits, R, X, Y, doit) \
do \
{ \
_FP_FRAC_DECL_4 (_FP_MUL_MEAT_2_wide_3mul_z); \
\
_FP_MUL_MEAT_DW_2_wide_3mul ((wfracbits), \
_FP_MUL_MEAT_2_wide_3mul_z, \
X, Y, doit); \
\
/* Normalize since we know where the msb of the multiplicands \
were (bit B), we know that the msb of the of the product is \
at either 2B or 2B-1. */ \
_FP_FRAC_SRS_4 (_FP_MUL_MEAT_2_wide_3mul_z, \
(wfracbits)-1, 2*(wfracbits)); \
R##_f0 = _FP_FRAC_WORD_4 (_FP_MUL_MEAT_2_wide_3mul_z, 0); \
R##_f1 = _FP_FRAC_WORD_4 (_FP_MUL_MEAT_2_wide_3mul_z, 1); \
} \
while (0)
#define _FP_MUL_MEAT_DW_2_gmp(wfracbits, R, X, Y) \
do \
{ \
_FP_W_TYPE _FP_MUL_MEAT_DW_2_gmp_x[2]; \
_FP_W_TYPE _FP_MUL_MEAT_DW_2_gmp_y[2]; \
_FP_MUL_MEAT_DW_2_gmp_x[0] = X##_f0; \
_FP_MUL_MEAT_DW_2_gmp_x[1] = X##_f1; \
_FP_MUL_MEAT_DW_2_gmp_y[0] = Y##_f0; \
_FP_MUL_MEAT_DW_2_gmp_y[1] = Y##_f1; \
\
mpn_mul_n (R##_f, _FP_MUL_MEAT_DW_2_gmp_x, \
_FP_MUL_MEAT_DW_2_gmp_y, 2); \
} \
while (0)
#define _FP_MUL_MEAT_2_gmp(wfracbits, R, X, Y) \
do \
{ \
_FP_FRAC_DECL_4 (_FP_MUL_MEAT_2_gmp_z); \
\
_FP_MUL_MEAT_DW_2_gmp ((wfracbits), _FP_MUL_MEAT_2_gmp_z, X, Y); \
\
/* Normalize since we know where the msb of the multiplicands \
were (bit B), we know that the msb of the of the product is \
at either 2B or 2B-1. */ \
_FP_FRAC_SRS_4 (_FP_MUL_MEAT_2_gmp_z, (wfracbits)-1, \
2*(wfracbits)); \
R##_f0 = _FP_MUL_MEAT_2_gmp_z_f[0]; \
R##_f1 = _FP_MUL_MEAT_2_gmp_z_f[1]; \
} \
while (0)
/* Do at most 120x120=240 bits multiplication using double floating
point multiplication. This is useful if floating point
multiplication has much bigger throughput than integer multiply.
It is supposed to work for _FP_W_TYPE_SIZE 64 and wfracbits
between 106 and 120 only.
Caller guarantees that X and Y has (1LLL << (wfracbits - 1)) set.
SETFETZ is a macro which will disable all FPU exceptions and set rounding
towards zero, RESETFE should optionally reset it back. */
#define _FP_MUL_MEAT_2_120_240_double(wfracbits, R, X, Y, setfetz, resetfe) \
do \
{ \
static const double _const[] = \
{ \
/* 2^-24 */ 5.9604644775390625e-08, \
/* 2^-48 */ 3.5527136788005009e-15, \
/* 2^-72 */ 2.1175823681357508e-22, \
/* 2^-96 */ 1.2621774483536189e-29, \
/* 2^28 */ 2.68435456e+08, \
/* 2^4 */ 1.600000e+01, \
/* 2^-20 */ 9.5367431640625e-07, \
/* 2^-44 */ 5.6843418860808015e-14, \
/* 2^-68 */ 3.3881317890172014e-21, \
/* 2^-92 */ 2.0194839173657902e-28, \
/* 2^-116 */ 1.2037062152420224e-35 \
}; \
double _a240, _b240, _c240, _d240, _e240, _f240, \
_g240, _h240, _i240, _j240, _k240; \
union { double d; UDItype i; } _l240, _m240, _n240, _o240, \
_p240, _q240, _r240, _s240; \
UDItype _t240, _u240, _v240, _w240, _x240, _y240 = 0; \
\
_FP_STATIC_ASSERT ((wfracbits) >= 106 && (wfracbits) <= 120, \
"wfracbits out of range"); \
\
setfetz; \
\
_e240 = (double) (long) (X##_f0 & 0xffffff); \
_j240 = (double) (long) (Y##_f0 & 0xffffff); \
_d240 = (double) (long) ((X##_f0 >> 24) & 0xffffff); \
_i240 = (double) (long) ((Y##_f0 >> 24) & 0xffffff); \
_c240 = (double) (long) (((X##_f1 << 16) & 0xffffff) | (X##_f0 >> 48)); \
_h240 = (double) (long) (((Y##_f1 << 16) & 0xffffff) | (Y##_f0 >> 48)); \
_b240 = (double) (long) ((X##_f1 >> 8) & 0xffffff); \
_g240 = (double) (long) ((Y##_f1 >> 8) & 0xffffff); \
_a240 = (double) (long) (X##_f1 >> 32); \
_f240 = (double) (long) (Y##_f1 >> 32); \
_e240 *= _const[3]; \
_j240 *= _const[3]; \
_d240 *= _const[2]; \
_i240 *= _const[2]; \
_c240 *= _const[1]; \
_h240 *= _const[1]; \
_b240 *= _const[0]; \
_g240 *= _const[0]; \
_s240.d = _e240*_j240; \
_r240.d = _d240*_j240 + _e240*_i240; \
_q240.d = _c240*_j240 + _d240*_i240 + _e240*_h240; \
_p240.d = _b240*_j240 + _c240*_i240 + _d240*_h240 + _e240*_g240; \
_o240.d = _a240*_j240 + _b240*_i240 + _c240*_h240 + _d240*_g240 + _e240*_f240; \
_n240.d = _a240*_i240 + _b240*_h240 + _c240*_g240 + _d240*_f240; \
_m240.d = _a240*_h240 + _b240*_g240 + _c240*_f240; \
_l240.d = _a240*_g240 + _b240*_f240; \
_k240 = _a240*_f240; \
_r240.d += _s240.d; \
_q240.d += _r240.d; \
_p240.d += _q240.d; \
_o240.d += _p240.d; \
_n240.d += _o240.d; \
_m240.d += _n240.d; \
_l240.d += _m240.d; \
_k240 += _l240.d; \
_s240.d -= ((_const[10]+_s240.d)-_const[10]); \
_r240.d -= ((_const[9]+_r240.d)-_const[9]); \
_q240.d -= ((_const[8]+_q240.d)-_const[8]); \
_p240.d -= ((_const[7]+_p240.d)-_const[7]); \
_o240.d += _const[7]; \
_n240.d += _const[6]; \
_m240.d += _const[5]; \
_l240.d += _const[4]; \
if (_s240.d != 0.0) \
_y240 = 1; \
if (_r240.d != 0.0) \
_y240 = 1; \
if (_q240.d != 0.0) \
_y240 = 1; \
if (_p240.d != 0.0) \
_y240 = 1; \
_t240 = (DItype) _k240; \
_u240 = _l240.i; \
_v240 = _m240.i; \
_w240 = _n240.i; \
_x240 = _o240.i; \
R##_f1 = ((_t240 << (128 - (wfracbits - 1))) \
| ((_u240 & 0xffffff) >> ((wfracbits - 1) - 104))); \
R##_f0 = (((_u240 & 0xffffff) << (168 - (wfracbits - 1))) \
| ((_v240 & 0xffffff) << (144 - (wfracbits - 1))) \
| ((_w240 & 0xffffff) << (120 - (wfracbits - 1))) \
| ((_x240 & 0xffffff) >> ((wfracbits - 1) - 96)) \
| _y240); \
resetfe; \
} \
while (0)
/* Division algorithms: */
#define _FP_DIV_MEAT_2_udiv(fs, R, X, Y) \
do \
{ \
_FP_W_TYPE _FP_DIV_MEAT_2_udiv_n_f2; \
_FP_W_TYPE _FP_DIV_MEAT_2_udiv_n_f1; \
_FP_W_TYPE _FP_DIV_MEAT_2_udiv_n_f0; \
_FP_W_TYPE _FP_DIV_MEAT_2_udiv_r_f1; \
_FP_W_TYPE _FP_DIV_MEAT_2_udiv_r_f0; \
_FP_W_TYPE _FP_DIV_MEAT_2_udiv_m_f1; \
_FP_W_TYPE _FP_DIV_MEAT_2_udiv_m_f0; \
if (_FP_FRAC_GE_2 (X, Y)) \
{ \
_FP_DIV_MEAT_2_udiv_n_f2 = X##_f1 >> 1; \
_FP_DIV_MEAT_2_udiv_n_f1 \
= X##_f1 << (_FP_W_TYPE_SIZE - 1) | X##_f0 >> 1; \
_FP_DIV_MEAT_2_udiv_n_f0 \
= X##_f0 << (_FP_W_TYPE_SIZE - 1); \
} \
else \
{ \
R##_e--; \
_FP_DIV_MEAT_2_udiv_n_f2 = X##_f1; \
_FP_DIV_MEAT_2_udiv_n_f1 = X##_f0; \
_FP_DIV_MEAT_2_udiv_n_f0 = 0; \
} \
\
/* Normalize, i.e. make the most significant bit of the \
denominator set. */ \
_FP_FRAC_SLL_2 (Y, _FP_WFRACXBITS_##fs); \
\
udiv_qrnnd (R##_f1, _FP_DIV_MEAT_2_udiv_r_f1, \
_FP_DIV_MEAT_2_udiv_n_f2, _FP_DIV_MEAT_2_udiv_n_f1, \
Y##_f1); \
umul_ppmm (_FP_DIV_MEAT_2_udiv_m_f1, _FP_DIV_MEAT_2_udiv_m_f0, \
R##_f1, Y##_f0); \
_FP_DIV_MEAT_2_udiv_r_f0 = _FP_DIV_MEAT_2_udiv_n_f0; \
if (_FP_FRAC_GT_2 (_FP_DIV_MEAT_2_udiv_m, _FP_DIV_MEAT_2_udiv_r)) \
{ \
R##_f1--; \
_FP_FRAC_ADD_2 (_FP_DIV_MEAT_2_udiv_r, Y, \
_FP_DIV_MEAT_2_udiv_r); \
if (_FP_FRAC_GE_2 (_FP_DIV_MEAT_2_udiv_r, Y) \
&& _FP_FRAC_GT_2 (_FP_DIV_MEAT_2_udiv_m, \
_FP_DIV_MEAT_2_udiv_r)) \
{ \
R##_f1--; \
_FP_FRAC_ADD_2 (_FP_DIV_MEAT_2_udiv_r, Y, \
_FP_DIV_MEAT_2_udiv_r); \
} \
} \
_FP_FRAC_DEC_2 (_FP_DIV_MEAT_2_udiv_r, _FP_DIV_MEAT_2_udiv_m); \
\
if (_FP_DIV_MEAT_2_udiv_r_f1 == Y##_f1) \
{ \
/* This is a special case, not an optimization \
(_FP_DIV_MEAT_2_udiv_r/Y##_f1 would not fit into UWtype). \
As _FP_DIV_MEAT_2_udiv_r is guaranteed to be < Y, \
R##_f0 can be either (UWtype)-1 or (UWtype)-2. But as we \
know what kind of bits it is (sticky, guard, round), \
we don't care. We also don't care what the reminder is, \
because the guard bit will be set anyway. -jj */ \
R##_f0 = -1; \
} \
else \
{ \
udiv_qrnnd (R##_f0, _FP_DIV_MEAT_2_udiv_r_f1, \
_FP_DIV_MEAT_2_udiv_r_f1, \
_FP_DIV_MEAT_2_udiv_r_f0, Y##_f1); \
umul_ppmm (_FP_DIV_MEAT_2_udiv_m_f1, \
_FP_DIV_MEAT_2_udiv_m_f0, R##_f0, Y##_f0); \
_FP_DIV_MEAT_2_udiv_r_f0 = 0; \
if (_FP_FRAC_GT_2 (_FP_DIV_MEAT_2_udiv_m, \
_FP_DIV_MEAT_2_udiv_r)) \
{ \
R##_f0--; \
_FP_FRAC_ADD_2 (_FP_DIV_MEAT_2_udiv_r, Y, \
_FP_DIV_MEAT_2_udiv_r); \
if (_FP_FRAC_GE_2 (_FP_DIV_MEAT_2_udiv_r, Y) \
&& _FP_FRAC_GT_2 (_FP_DIV_MEAT_2_udiv_m, \
_FP_DIV_MEAT_2_udiv_r)) \
{ \
R##_f0--; \
_FP_FRAC_ADD_2 (_FP_DIV_MEAT_2_udiv_r, Y, \
_FP_DIV_MEAT_2_udiv_r); \
} \
} \
if (!_FP_FRAC_EQ_2 (_FP_DIV_MEAT_2_udiv_r, \
_FP_DIV_MEAT_2_udiv_m)) \
R##_f0 |= _FP_WORK_STICKY; \
} \
} \
while (0)
/* Square root algorithms:
We have just one right now, maybe Newton approximation
should be added for those machines where division is fast. */
#define _FP_SQRT_MEAT_2(R, S, T, X, q) \
do \
{ \
while (q) \
{ \
T##_f1 = S##_f1 + (q); \
if (T##_f1 <= X##_f1) \
{ \
S##_f1 = T##_f1 + (q); \
X##_f1 -= T##_f1; \
R##_f1 += (q); \
} \
_FP_FRAC_SLL_2 (X, 1); \
(q) >>= 1; \
} \
(q) = (_FP_W_TYPE) 1 << (_FP_W_TYPE_SIZE - 1); \
while ((q) != _FP_WORK_ROUND) \
{ \
T##_f0 = S##_f0 + (q); \
T##_f1 = S##_f1; \
if (T##_f1 < X##_f1 \
|| (T##_f1 == X##_f1 && T##_f0 <= X##_f0)) \
{ \
S##_f0 = T##_f0 + (q); \
S##_f1 += (T##_f0 > S##_f0); \
_FP_FRAC_DEC_2 (X, T); \
R##_f0 += (q); \
} \
_FP_FRAC_SLL_2 (X, 1); \
(q) >>= 1; \
} \
if (X##_f0 | X##_f1) \
{ \
if (S##_f1 < X##_f1 \
|| (S##_f1 == X##_f1 && S##_f0 < X##_f0)) \
R##_f0 |= _FP_WORK_ROUND; \
R##_f0 |= _FP_WORK_STICKY; \
} \
} \
while (0)
/* Assembly/disassembly for converting to/from integral types.
No shifting or overflow handled here. */
#define _FP_FRAC_ASSEMBLE_2(r, X, rsize) \
(void) (((rsize) <= _FP_W_TYPE_SIZE) \
? ({ (r) = X##_f0; }) \
: ({ \
(r) = X##_f1; \
(r) <<= _FP_W_TYPE_SIZE; \
(r) += X##_f0; \
}))
#define _FP_FRAC_DISASSEMBLE_2(X, r, rsize) \
do \
{ \
X##_f0 = (r); \
X##_f1 = ((rsize) <= _FP_W_TYPE_SIZE \
? 0 \
: (r) >> _FP_W_TYPE_SIZE); \
} \
while (0)
/* Convert FP values between word sizes. */
#define _FP_FRAC_COPY_1_2(D, S) (D##_f = S##_f0)
#define _FP_FRAC_COPY_2_1(D, S) ((D##_f0 = S##_f), (D##_f1 = 0))
#define _FP_FRAC_COPY_2_2(D, S) _FP_FRAC_COPY_2 (D, S)
#endif /* !SOFT_FP_OP_2_H */
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