mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-25 22:40:05 +00:00
2004e7fb76
Continuing the series of patches adding soft-fp features from the kernel version of soft-fp to glibc so that glibc's version is able to replace the old fork of soft-fp in the kernel, this patch adds the last major such feature: _FP_TO_INT_ROUND, converting a floating-point number to an integer with rounding according to the current rounding direction (as opposed to truncating towards zero, which _FP_TO_INT does). The general structure of the implementation follows that of _FP_TO_INT, but of course is more complicated. As with glibc's _FP_TO_INT it works with raw input (the kernel versions of these macros predate the conversion of _FP_TO_INT and many other macros to raw or semi-raw input). I have not tried to work out what bugs there might be in the kernel version that this might fix; it's a from-scratch implementation based on _FP_TO_INT. Tested for powerpc (soft-float) that there is no change to the installed shared libraries; also tested with the libm tests with lrint / lrintf / llrint / llrintf made to use _FP_TO_INT_ROUND, to provide some test of the functionality. As we don't have benchmarks for those functions, I haven't actually included the soft-fp versions of them, although I expect them to be faster than the existing code (given that the existing code involves adding and subtracting numbers such as 0x1p52 to achieve the desired rounding, which is not particularly efficient when the underlying floating point is software floating point). 2014-11-04 Joseph Myers <joseph@codesourcery.com> * soft-fp/op-common.h (_FP_TO_INT_ROUND): New macro. * soft-fp/double.h [_FP_W_TYPE_SIZE < 64] (FP_TO_INT_ROUND_D): New macro. [_FP_W_TYPE_SIZE >= 64] (FP_TO_INT_ROUND_D): Likewise. * soft-fp/extended.h [_FP_W_TYPE_SIZE < 64] (FP_TO_INT_ROUND_E): New macro. [_FP_W_TYPE_SIZE >= 64] (FP_TO_INT_ROUND_E): Likewise. * soft-fp/quad.h [_FP_W_TYPE_SIZE < 64] (FP_TO_INT_ROUND_Q): New macro. [_FP_W_TYPE_SIZE >= 64] (FP_TO_INT_ROUND_Q): Likewise. * soft-fp/single.h (FP_TO_INT_ROUND_S): New macro.
326 lines
9.9 KiB
C
326 lines
9.9 KiB
C
/* Software floating-point emulation.
|
|
Definitions for IEEE Quad Precision.
|
|
Copyright (C) 1997-2014 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Richard Henderson (rth@cygnus.com),
|
|
Jakub Jelinek (jj@ultra.linux.cz),
|
|
David S. Miller (davem@redhat.com) and
|
|
Peter Maydell (pmaydell@chiark.greenend.org.uk).
|
|
|
|
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
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#if _FP_W_TYPE_SIZE < 32
|
|
# error "Here's a nickel, kid. Go buy yourself a real computer."
|
|
#endif
|
|
|
|
#if _FP_W_TYPE_SIZE < 64
|
|
# define _FP_FRACTBITS_Q (4*_FP_W_TYPE_SIZE)
|
|
# define _FP_FRACTBITS_DW_Q (8*_FP_W_TYPE_SIZE)
|
|
#else
|
|
# define _FP_FRACTBITS_Q (2*_FP_W_TYPE_SIZE)
|
|
# define _FP_FRACTBITS_DW_Q (4*_FP_W_TYPE_SIZE)
|
|
#endif
|
|
|
|
#define _FP_FRACBITS_Q 113
|
|
#define _FP_FRACXBITS_Q (_FP_FRACTBITS_Q - _FP_FRACBITS_Q)
|
|
#define _FP_WFRACBITS_Q (_FP_WORKBITS + _FP_FRACBITS_Q)
|
|
#define _FP_WFRACXBITS_Q (_FP_FRACTBITS_Q - _FP_WFRACBITS_Q)
|
|
#define _FP_EXPBITS_Q 15
|
|
#define _FP_EXPBIAS_Q 16383
|
|
#define _FP_EXPMAX_Q 32767
|
|
|
|
#define _FP_QNANBIT_Q \
|
|
((_FP_W_TYPE) 1 << (_FP_FRACBITS_Q-2) % _FP_W_TYPE_SIZE)
|
|
#define _FP_QNANBIT_SH_Q \
|
|
((_FP_W_TYPE) 1 << (_FP_FRACBITS_Q-2+_FP_WORKBITS) % _FP_W_TYPE_SIZE)
|
|
#define _FP_IMPLBIT_Q \
|
|
((_FP_W_TYPE) 1 << (_FP_FRACBITS_Q-1) % _FP_W_TYPE_SIZE)
|
|
#define _FP_IMPLBIT_SH_Q \
|
|
((_FP_W_TYPE) 1 << (_FP_FRACBITS_Q-1+_FP_WORKBITS) % _FP_W_TYPE_SIZE)
|
|
#define _FP_OVERFLOW_Q \
|
|
((_FP_W_TYPE) 1 << (_FP_WFRACBITS_Q % _FP_W_TYPE_SIZE))
|
|
|
|
#define _FP_WFRACBITS_DW_Q (2 * _FP_WFRACBITS_Q)
|
|
#define _FP_WFRACXBITS_DW_Q (_FP_FRACTBITS_DW_Q - _FP_WFRACBITS_DW_Q)
|
|
#define _FP_HIGHBIT_DW_Q \
|
|
((_FP_W_TYPE) 1 << (_FP_WFRACBITS_DW_Q - 1) % _FP_W_TYPE_SIZE)
|
|
|
|
typedef float TFtype __attribute__ ((mode (TF)));
|
|
|
|
#if _FP_W_TYPE_SIZE < 64
|
|
|
|
union _FP_UNION_Q
|
|
{
|
|
TFtype flt;
|
|
struct _FP_STRUCT_LAYOUT
|
|
{
|
|
# if __BYTE_ORDER == __BIG_ENDIAN
|
|
unsigned sign : 1;
|
|
unsigned exp : _FP_EXPBITS_Q;
|
|
unsigned long frac3 : _FP_FRACBITS_Q - (_FP_IMPLBIT_Q != 0)-(_FP_W_TYPE_SIZE * 3);
|
|
unsigned long frac2 : _FP_W_TYPE_SIZE;
|
|
unsigned long frac1 : _FP_W_TYPE_SIZE;
|
|
unsigned long frac0 : _FP_W_TYPE_SIZE;
|
|
# else
|
|
unsigned long frac0 : _FP_W_TYPE_SIZE;
|
|
unsigned long frac1 : _FP_W_TYPE_SIZE;
|
|
unsigned long frac2 : _FP_W_TYPE_SIZE;
|
|
unsigned long frac3 : _FP_FRACBITS_Q - (_FP_IMPLBIT_Q != 0)-(_FP_W_TYPE_SIZE * 3);
|
|
unsigned exp : _FP_EXPBITS_Q;
|
|
unsigned sign : 1;
|
|
# endif /* not bigendian */
|
|
} bits __attribute__ ((packed));
|
|
};
|
|
|
|
|
|
# define FP_DECL_Q(X) _FP_DECL (4, X)
|
|
# define FP_UNPACK_RAW_Q(X, val) _FP_UNPACK_RAW_4 (Q, X, (val))
|
|
# define FP_UNPACK_RAW_QP(X, val) _FP_UNPACK_RAW_4_P (Q, X, (val))
|
|
# define FP_PACK_RAW_Q(val, X) _FP_PACK_RAW_4 (Q, (val), X)
|
|
# define FP_PACK_RAW_QP(val, X) \
|
|
do \
|
|
{ \
|
|
if (!FP_INHIBIT_RESULTS) \
|
|
_FP_PACK_RAW_4_P (Q, (val), X); \
|
|
} \
|
|
while (0)
|
|
|
|
# define FP_UNPACK_Q(X, val) \
|
|
do \
|
|
{ \
|
|
_FP_UNPACK_RAW_4 (Q, X, (val)); \
|
|
_FP_UNPACK_CANONICAL (Q, 4, X); \
|
|
} \
|
|
while (0)
|
|
|
|
# define FP_UNPACK_QP(X, val) \
|
|
do \
|
|
{ \
|
|
_FP_UNPACK_RAW_4_P (Q, X, (val)); \
|
|
_FP_UNPACK_CANONICAL (Q, 4, X); \
|
|
} \
|
|
while (0)
|
|
|
|
# define FP_UNPACK_SEMIRAW_Q(X, val) \
|
|
do \
|
|
{ \
|
|
_FP_UNPACK_RAW_4 (Q, X, (val)); \
|
|
_FP_UNPACK_SEMIRAW (Q, 4, X); \
|
|
} \
|
|
while (0)
|
|
|
|
# define FP_UNPACK_SEMIRAW_QP(X, val) \
|
|
do \
|
|
{ \
|
|
_FP_UNPACK_RAW_4_P (Q, X, (val)); \
|
|
_FP_UNPACK_SEMIRAW (Q, 4, X); \
|
|
} \
|
|
while (0)
|
|
|
|
# define FP_PACK_Q(val, X) \
|
|
do \
|
|
{ \
|
|
_FP_PACK_CANONICAL (Q, 4, X); \
|
|
_FP_PACK_RAW_4 (Q, (val), X); \
|
|
} \
|
|
while (0)
|
|
|
|
# define FP_PACK_QP(val, X) \
|
|
do \
|
|
{ \
|
|
_FP_PACK_CANONICAL (Q, 4, X); \
|
|
if (!FP_INHIBIT_RESULTS) \
|
|
_FP_PACK_RAW_4_P (Q, (val), X); \
|
|
} \
|
|
while (0)
|
|
|
|
# define FP_PACK_SEMIRAW_Q(val, X) \
|
|
do \
|
|
{ \
|
|
_FP_PACK_SEMIRAW (Q, 4, X); \
|
|
_FP_PACK_RAW_4 (Q, (val), X); \
|
|
} \
|
|
while (0)
|
|
|
|
# define FP_PACK_SEMIRAW_QP(val, X) \
|
|
do \
|
|
{ \
|
|
_FP_PACK_SEMIRAW (Q, 4, X); \
|
|
if (!FP_INHIBIT_RESULTS) \
|
|
_FP_PACK_RAW_4_P (Q, (val), X); \
|
|
} \
|
|
while (0)
|
|
|
|
# define FP_ISSIGNAN_Q(X) _FP_ISSIGNAN (Q, 4, X)
|
|
# define FP_NEG_Q(R, X) _FP_NEG (Q, 4, R, X)
|
|
# define FP_ADD_Q(R, X, Y) _FP_ADD (Q, 4, R, X, Y)
|
|
# define FP_SUB_Q(R, X, Y) _FP_SUB (Q, 4, R, X, Y)
|
|
# define FP_MUL_Q(R, X, Y) _FP_MUL (Q, 4, R, X, Y)
|
|
# define FP_DIV_Q(R, X, Y) _FP_DIV (Q, 4, R, X, Y)
|
|
# define FP_SQRT_Q(R, X) _FP_SQRT (Q, 4, R, X)
|
|
# define _FP_SQRT_MEAT_Q(R, S, T, X, Q) _FP_SQRT_MEAT_4 (R, S, T, X, (Q))
|
|
# define FP_FMA_Q(R, X, Y, Z) _FP_FMA (Q, 4, 8, R, X, Y, Z)
|
|
|
|
# define FP_CMP_Q(r, X, Y, un, ex) _FP_CMP (Q, 4, (r), X, Y, (un), (ex))
|
|
# define FP_CMP_EQ_Q(r, X, Y, ex) _FP_CMP_EQ (Q, 4, (r), X, Y, (ex))
|
|
# define FP_CMP_UNORD_Q(r, X, Y, ex) _FP_CMP_UNORD (Q, 4, (r), X, Y, (ex))
|
|
|
|
# define FP_TO_INT_Q(r, X, rsz, rsg) _FP_TO_INT (Q, 4, (r), X, (rsz), (rsg))
|
|
# define FP_TO_INT_ROUND_Q(r, X, rsz, rsg) \
|
|
_FP_TO_INT_ROUND (Q, 4, (r), X, (rsz), (rsg))
|
|
# define FP_FROM_INT_Q(X, r, rs, rt) _FP_FROM_INT (Q, 4, X, (r), (rs), rt)
|
|
|
|
# define _FP_FRAC_HIGH_Q(X) _FP_FRAC_HIGH_4 (X)
|
|
# define _FP_FRAC_HIGH_RAW_Q(X) _FP_FRAC_HIGH_4 (X)
|
|
|
|
# define _FP_FRAC_HIGH_DW_Q(X) _FP_FRAC_HIGH_8 (X)
|
|
|
|
#else /* not _FP_W_TYPE_SIZE < 64 */
|
|
union _FP_UNION_Q
|
|
{
|
|
TFtype flt /* __attribute__ ((mode (TF))) */ ;
|
|
struct _FP_STRUCT_LAYOUT
|
|
{
|
|
_FP_W_TYPE a, b;
|
|
} longs;
|
|
struct _FP_STRUCT_LAYOUT
|
|
{
|
|
# if __BYTE_ORDER == __BIG_ENDIAN
|
|
unsigned sign : 1;
|
|
unsigned exp : _FP_EXPBITS_Q;
|
|
_FP_W_TYPE frac1 : _FP_FRACBITS_Q - (_FP_IMPLBIT_Q != 0) - _FP_W_TYPE_SIZE;
|
|
_FP_W_TYPE frac0 : _FP_W_TYPE_SIZE;
|
|
# else
|
|
_FP_W_TYPE frac0 : _FP_W_TYPE_SIZE;
|
|
_FP_W_TYPE frac1 : _FP_FRACBITS_Q - (_FP_IMPLBIT_Q != 0) - _FP_W_TYPE_SIZE;
|
|
unsigned exp : _FP_EXPBITS_Q;
|
|
unsigned sign : 1;
|
|
# endif
|
|
} bits;
|
|
};
|
|
|
|
# define FP_DECL_Q(X) _FP_DECL (2, X)
|
|
# define FP_UNPACK_RAW_Q(X, val) _FP_UNPACK_RAW_2 (Q, X, (val))
|
|
# define FP_UNPACK_RAW_QP(X, val) _FP_UNPACK_RAW_2_P (Q, X, (val))
|
|
# define FP_PACK_RAW_Q(val, X) _FP_PACK_RAW_2 (Q, (val), X)
|
|
# define FP_PACK_RAW_QP(val, X) \
|
|
do \
|
|
{ \
|
|
if (!FP_INHIBIT_RESULTS) \
|
|
_FP_PACK_RAW_2_P (Q, (val), X); \
|
|
} \
|
|
while (0)
|
|
|
|
# define FP_UNPACK_Q(X, val) \
|
|
do \
|
|
{ \
|
|
_FP_UNPACK_RAW_2 (Q, X, (val)); \
|
|
_FP_UNPACK_CANONICAL (Q, 2, X); \
|
|
} \
|
|
while (0)
|
|
|
|
# define FP_UNPACK_QP(X, val) \
|
|
do \
|
|
{ \
|
|
_FP_UNPACK_RAW_2_P (Q, X, (val)); \
|
|
_FP_UNPACK_CANONICAL (Q, 2, X); \
|
|
} \
|
|
while (0)
|
|
|
|
# define FP_UNPACK_SEMIRAW_Q(X, val) \
|
|
do \
|
|
{ \
|
|
_FP_UNPACK_RAW_2 (Q, X, (val)); \
|
|
_FP_UNPACK_SEMIRAW (Q, 2, X); \
|
|
} \
|
|
while (0)
|
|
|
|
# define FP_UNPACK_SEMIRAW_QP(X, val) \
|
|
do \
|
|
{ \
|
|
_FP_UNPACK_RAW_2_P (Q, X, (val)); \
|
|
_FP_UNPACK_SEMIRAW (Q, 2, X); \
|
|
} \
|
|
while (0)
|
|
|
|
# define FP_PACK_Q(val, X) \
|
|
do \
|
|
{ \
|
|
_FP_PACK_CANONICAL (Q, 2, X); \
|
|
_FP_PACK_RAW_2 (Q, (val), X); \
|
|
} \
|
|
while (0)
|
|
|
|
# define FP_PACK_QP(val, X) \
|
|
do \
|
|
{ \
|
|
_FP_PACK_CANONICAL (Q, 2, X); \
|
|
if (!FP_INHIBIT_RESULTS) \
|
|
_FP_PACK_RAW_2_P (Q, (val), X); \
|
|
} \
|
|
while (0)
|
|
|
|
# define FP_PACK_SEMIRAW_Q(val, X) \
|
|
do \
|
|
{ \
|
|
_FP_PACK_SEMIRAW (Q, 2, X); \
|
|
_FP_PACK_RAW_2 (Q, (val), X); \
|
|
} \
|
|
while (0)
|
|
|
|
# define FP_PACK_SEMIRAW_QP(val, X) \
|
|
do \
|
|
{ \
|
|
_FP_PACK_SEMIRAW (Q, 2, X); \
|
|
if (!FP_INHIBIT_RESULTS) \
|
|
_FP_PACK_RAW_2_P (Q, (val), X); \
|
|
} \
|
|
while (0)
|
|
|
|
# define FP_ISSIGNAN_Q(X) _FP_ISSIGNAN (Q, 2, X)
|
|
# define FP_NEG_Q(R, X) _FP_NEG (Q, 2, R, X)
|
|
# define FP_ADD_Q(R, X, Y) _FP_ADD (Q, 2, R, X, Y)
|
|
# define FP_SUB_Q(R, X, Y) _FP_SUB (Q, 2, R, X, Y)
|
|
# define FP_MUL_Q(R, X, Y) _FP_MUL (Q, 2, R, X, Y)
|
|
# define FP_DIV_Q(R, X, Y) _FP_DIV (Q, 2, R, X, Y)
|
|
# define FP_SQRT_Q(R, X) _FP_SQRT (Q, 2, R, X)
|
|
# define _FP_SQRT_MEAT_Q(R, S, T, X, Q) _FP_SQRT_MEAT_2 (R, S, T, X, (Q))
|
|
# define FP_FMA_Q(R, X, Y, Z) _FP_FMA (Q, 2, 4, R, X, Y, Z)
|
|
|
|
# define FP_CMP_Q(r, X, Y, un, ex) _FP_CMP (Q, 2, (r), X, Y, (un), (ex))
|
|
# define FP_CMP_EQ_Q(r, X, Y, ex) _FP_CMP_EQ (Q, 2, (r), X, Y, (ex))
|
|
# define FP_CMP_UNORD_Q(r, X, Y, ex) _FP_CMP_UNORD (Q, 2, (r), X, Y, (ex))
|
|
|
|
# define FP_TO_INT_Q(r, X, rsz, rsg) _FP_TO_INT (Q, 2, (r), X, (rsz), (rsg))
|
|
# define FP_TO_INT_ROUND_Q(r, X, rsz, rsg) \
|
|
_FP_TO_INT_ROUND (Q, 2, (r), X, (rsz), (rsg))
|
|
# define FP_FROM_INT_Q(X, r, rs, rt) _FP_FROM_INT (Q, 2, X, (r), (rs), rt)
|
|
|
|
# define _FP_FRAC_HIGH_Q(X) _FP_FRAC_HIGH_2 (X)
|
|
# define _FP_FRAC_HIGH_RAW_Q(X) _FP_FRAC_HIGH_2 (X)
|
|
|
|
# define _FP_FRAC_HIGH_DW_Q(X) _FP_FRAC_HIGH_4 (X)
|
|
|
|
#endif /* not _FP_W_TYPE_SIZE < 64 */
|