mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-12 16:20:06 +00:00
af1d5782c1
Here only add the implementation when building the RV32 port.
These macros are used when the following situations occur at the same
time: soft-fp fma, ldbl-128 and 32-bit _FP_W_TYPE_SIZE. The RISC-V
32-bit port is the first port which use all three together.
This is the building flow about the situation:
When building soft-fp/s_fmal.c, there uses the FP_FMA_Q in __fmal.
The _FP_W_TYPE_SIZE is defined to 32-bit in sysdeps/riscv/sfp-machine.h,
so the FP_FMA_Q was defined to _FP_FMA (Q, 4, 8, R, X, Y, Z) in
soft-fp/quad.h.
Something in the soft-fp/quad.h:
#if _FP_W_TYPE_SIZE < 64
# define FP_FMA_Q(R, X, Y, Z) _FP_FMA (Q, 4, 8, R, X, Y, Z)
#else
# define FP_FMA_Q(R, X, Y, Z) _FP_FMA (Q, 2, 4, R, X, Y, Z)
#endif
Finally, in _FP_FMA (fs, wc, dwc, R, X, Y, Z), it will use the
_FP_FRAC_HIGHBIT_DW_##dwc macro, and it will be expanded to
_FP_FRAC_HIGHBIT_DW_8, but the _FP_FRAC_HIGHBIT_DW_8 is not be
implemented in soft-fp/op-8.h. there is only _FP_FRAC_HIGHBIT_DW_1,
_FP_FRAC_HIGHBIT_DW_2 and _FP_FRAC_HIGHBIT_DW_4 in the
soft-fp/op-*.h.
After this modification, we can pass the soft floating testing of glibc
testsuites on RV32.
* soft-fp/op-8.h (_FP_FRAC_SET_8, _FP_FRAC_ADD_8, _FP_FRAC_SUB_8)
(_FP_FRAC_CLZ_8, _FP_MINFRAC_8, _FP_FRAC_NEGP_8, _FP_FRAC_ZEROP_8)
(_FP_FRAC_HIGHBIT_DW_8, _FP_FRAC_COPY_4_8, _FP_FRAC_COPY_8_4)
(__FP_FRAC_SET_8): Add implementation for RV32 use.
239 lines
11 KiB
C
239 lines
11 KiB
C
/* Software floating-point emulation.
|
|
Basic eight-word fraction declaration and manipulation.
|
|
Copyright (C) 1997-2018 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) 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/>. */
|
|
|
|
#ifndef SOFT_FP_OP_8_H
|
|
#define SOFT_FP_OP_8_H 1
|
|
|
|
/* We need just a few things from here for op-4, if we ever need some
|
|
other macros, they can be added. */
|
|
#define _FP_FRAC_DECL_8(X) _FP_W_TYPE X##_f[8]
|
|
#define _FP_FRAC_SET_8(X, I) __FP_FRAC_SET_8 (X, I)
|
|
#define _FP_FRAC_HIGH_8(X) (X##_f[7])
|
|
#define _FP_FRAC_LOW_8(X) (X##_f[0])
|
|
#define _FP_FRAC_WORD_8(X, w) (X##_f[w])
|
|
|
|
#define _FP_FRAC_SLL_8(X, N) \
|
|
do \
|
|
{ \
|
|
_FP_I_TYPE _FP_FRAC_SLL_8_up, _FP_FRAC_SLL_8_down; \
|
|
_FP_I_TYPE _FP_FRAC_SLL_8_skip, _FP_FRAC_SLL_8_i; \
|
|
_FP_FRAC_SLL_8_skip = (N) / _FP_W_TYPE_SIZE; \
|
|
_FP_FRAC_SLL_8_up = (N) % _FP_W_TYPE_SIZE; \
|
|
_FP_FRAC_SLL_8_down = _FP_W_TYPE_SIZE - _FP_FRAC_SLL_8_up; \
|
|
if (!_FP_FRAC_SLL_8_up) \
|
|
for (_FP_FRAC_SLL_8_i = 7; \
|
|
_FP_FRAC_SLL_8_i >= _FP_FRAC_SLL_8_skip; \
|
|
--_FP_FRAC_SLL_8_i) \
|
|
X##_f[_FP_FRAC_SLL_8_i] \
|
|
= X##_f[_FP_FRAC_SLL_8_i-_FP_FRAC_SLL_8_skip]; \
|
|
else \
|
|
{ \
|
|
for (_FP_FRAC_SLL_8_i = 7; \
|
|
_FP_FRAC_SLL_8_i > _FP_FRAC_SLL_8_skip; \
|
|
--_FP_FRAC_SLL_8_i) \
|
|
X##_f[_FP_FRAC_SLL_8_i] \
|
|
= ((X##_f[_FP_FRAC_SLL_8_i-_FP_FRAC_SLL_8_skip] \
|
|
<< _FP_FRAC_SLL_8_up) \
|
|
| (X##_f[_FP_FRAC_SLL_8_i-_FP_FRAC_SLL_8_skip-1] \
|
|
>> _FP_FRAC_SLL_8_down)); \
|
|
X##_f[_FP_FRAC_SLL_8_i--] = X##_f[0] << _FP_FRAC_SLL_8_up; \
|
|
} \
|
|
for (; _FP_FRAC_SLL_8_i >= 0; --_FP_FRAC_SLL_8_i) \
|
|
X##_f[_FP_FRAC_SLL_8_i] = 0; \
|
|
} \
|
|
while (0)
|
|
|
|
#define _FP_FRAC_SRL_8(X, N) \
|
|
do \
|
|
{ \
|
|
_FP_I_TYPE _FP_FRAC_SRL_8_up, _FP_FRAC_SRL_8_down; \
|
|
_FP_I_TYPE _FP_FRAC_SRL_8_skip, _FP_FRAC_SRL_8_i; \
|
|
_FP_FRAC_SRL_8_skip = (N) / _FP_W_TYPE_SIZE; \
|
|
_FP_FRAC_SRL_8_down = (N) % _FP_W_TYPE_SIZE; \
|
|
_FP_FRAC_SRL_8_up = _FP_W_TYPE_SIZE - _FP_FRAC_SRL_8_down; \
|
|
if (!_FP_FRAC_SRL_8_down) \
|
|
for (_FP_FRAC_SRL_8_i = 0; \
|
|
_FP_FRAC_SRL_8_i <= 7-_FP_FRAC_SRL_8_skip; \
|
|
++_FP_FRAC_SRL_8_i) \
|
|
X##_f[_FP_FRAC_SRL_8_i] \
|
|
= X##_f[_FP_FRAC_SRL_8_i+_FP_FRAC_SRL_8_skip]; \
|
|
else \
|
|
{ \
|
|
for (_FP_FRAC_SRL_8_i = 0; \
|
|
_FP_FRAC_SRL_8_i < 7-_FP_FRAC_SRL_8_skip; \
|
|
++_FP_FRAC_SRL_8_i) \
|
|
X##_f[_FP_FRAC_SRL_8_i] \
|
|
= ((X##_f[_FP_FRAC_SRL_8_i+_FP_FRAC_SRL_8_skip] \
|
|
>> _FP_FRAC_SRL_8_down) \
|
|
| (X##_f[_FP_FRAC_SRL_8_i+_FP_FRAC_SRL_8_skip+1] \
|
|
<< _FP_FRAC_SRL_8_up)); \
|
|
X##_f[_FP_FRAC_SRL_8_i++] = X##_f[7] >> _FP_FRAC_SRL_8_down; \
|
|
} \
|
|
for (; _FP_FRAC_SRL_8_i < 8; ++_FP_FRAC_SRL_8_i) \
|
|
X##_f[_FP_FRAC_SRL_8_i] = 0; \
|
|
} \
|
|
while (0)
|
|
|
|
|
|
/* Right shift with sticky-lsb.
|
|
What this actually means is that we do a standard right-shift,
|
|
but that if any of the bits that fall off the right hand side
|
|
were one then we always set the LSbit. */
|
|
#define _FP_FRAC_SRS_8(X, N, size) \
|
|
do \
|
|
{ \
|
|
_FP_I_TYPE _FP_FRAC_SRS_8_up, _FP_FRAC_SRS_8_down; \
|
|
_FP_I_TYPE _FP_FRAC_SRS_8_skip, _FP_FRAC_SRS_8_i; \
|
|
_FP_W_TYPE _FP_FRAC_SRS_8_s; \
|
|
_FP_FRAC_SRS_8_skip = (N) / _FP_W_TYPE_SIZE; \
|
|
_FP_FRAC_SRS_8_down = (N) % _FP_W_TYPE_SIZE; \
|
|
_FP_FRAC_SRS_8_up = _FP_W_TYPE_SIZE - _FP_FRAC_SRS_8_down; \
|
|
for (_FP_FRAC_SRS_8_s = _FP_FRAC_SRS_8_i = 0; \
|
|
_FP_FRAC_SRS_8_i < _FP_FRAC_SRS_8_skip; \
|
|
++_FP_FRAC_SRS_8_i) \
|
|
_FP_FRAC_SRS_8_s |= X##_f[_FP_FRAC_SRS_8_i]; \
|
|
if (!_FP_FRAC_SRS_8_down) \
|
|
for (_FP_FRAC_SRS_8_i = 0; \
|
|
_FP_FRAC_SRS_8_i <= 7-_FP_FRAC_SRS_8_skip; \
|
|
++_FP_FRAC_SRS_8_i) \
|
|
X##_f[_FP_FRAC_SRS_8_i] \
|
|
= X##_f[_FP_FRAC_SRS_8_i+_FP_FRAC_SRS_8_skip]; \
|
|
else \
|
|
{ \
|
|
_FP_FRAC_SRS_8_s \
|
|
|= X##_f[_FP_FRAC_SRS_8_i] << _FP_FRAC_SRS_8_up; \
|
|
for (_FP_FRAC_SRS_8_i = 0; \
|
|
_FP_FRAC_SRS_8_i < 7-_FP_FRAC_SRS_8_skip; \
|
|
++_FP_FRAC_SRS_8_i) \
|
|
X##_f[_FP_FRAC_SRS_8_i] \
|
|
= ((X##_f[_FP_FRAC_SRS_8_i+_FP_FRAC_SRS_8_skip] \
|
|
>> _FP_FRAC_SRS_8_down) \
|
|
| (X##_f[_FP_FRAC_SRS_8_i+_FP_FRAC_SRS_8_skip+1] \
|
|
<< _FP_FRAC_SRS_8_up)); \
|
|
X##_f[_FP_FRAC_SRS_8_i++] = X##_f[7] >> _FP_FRAC_SRS_8_down; \
|
|
} \
|
|
for (; _FP_FRAC_SRS_8_i < 8; ++_FP_FRAC_SRS_8_i) \
|
|
X##_f[_FP_FRAC_SRS_8_i] = 0; \
|
|
/* Don't fix the LSB until the very end when we're sure f[0] is \
|
|
stable. */ \
|
|
X##_f[0] |= (_FP_FRAC_SRS_8_s != 0); \
|
|
} \
|
|
while (0)
|
|
|
|
#define _FP_FRAC_ADD_8(R, X, Y) \
|
|
do \
|
|
{ \
|
|
_FP_W_TYPE _FP_FRAC_ADD_8_c = 0; \
|
|
_FP_I_TYPE _FP_FRAC_ADD_8_i; \
|
|
for (_FP_FRAC_ADD_8_i = 0; _FP_FRAC_ADD_8_i < 8; ++_FP_FRAC_ADD_8_i) \
|
|
{ \
|
|
R##_f[_FP_FRAC_ADD_8_i] \
|
|
= (X##_f[_FP_FRAC_ADD_8_i] + Y##_f[_FP_FRAC_ADD_8_i] \
|
|
+ _FP_FRAC_ADD_8_c); \
|
|
_FP_FRAC_ADD_8_c \
|
|
= (_FP_FRAC_ADD_8_c \
|
|
? R##_f[_FP_FRAC_ADD_8_i] <= X##_f[_FP_FRAC_ADD_8_i] \
|
|
: R##_f[_FP_FRAC_ADD_8_i] < X##_f[_FP_FRAC_ADD_8_i]); \
|
|
} \
|
|
} \
|
|
while (0)
|
|
|
|
#define _FP_FRAC_SUB_8(R, X, Y) \
|
|
do \
|
|
{ \
|
|
_FP_W_TYPE _FP_FRAC_SUB_8_tmp[8]; \
|
|
_FP_W_TYPE _FP_FRAC_SUB_8_c = 0; \
|
|
_FP_I_TYPE _FP_FRAC_SUB_8_i; \
|
|
for (_FP_FRAC_SUB_8_i = 0; _FP_FRAC_SUB_8_i < 8; ++_FP_FRAC_SUB_8_i) \
|
|
{ \
|
|
_FP_FRAC_SUB_8_tmp[_FP_FRAC_SUB_8_i] \
|
|
= (X##_f[_FP_FRAC_SUB_8_i] - Y##_f[_FP_FRAC_SUB_8_i] \
|
|
- _FP_FRAC_SUB_8_c); \
|
|
_FP_FRAC_SUB_8_c \
|
|
= (_FP_FRAC_SUB_8_c \
|
|
? (_FP_FRAC_SUB_8_tmp[_FP_FRAC_SUB_8_i] \
|
|
>= X##_f[_FP_FRAC_SUB_8_i]) \
|
|
: (_FP_FRAC_SUB_8_tmp[_FP_FRAC_SUB_8_i] \
|
|
> X##_f[_FP_FRAC_SUB_8_i])); \
|
|
} \
|
|
for (_FP_FRAC_SUB_8_i = 0; _FP_FRAC_SUB_8_i < 8; ++_FP_FRAC_SUB_8_i) \
|
|
R##_f[_FP_FRAC_SUB_8_i] = _FP_FRAC_SUB_8_tmp[_FP_FRAC_SUB_8_i]; \
|
|
} \
|
|
while (0)
|
|
|
|
#define _FP_FRAC_CLZ_8(R, X) \
|
|
do \
|
|
{ \
|
|
_FP_I_TYPE _FP_FRAC_CLZ_8_i; \
|
|
for (_FP_FRAC_CLZ_8_i = 7; _FP_FRAC_CLZ_8_i > 0; _FP_FRAC_CLZ_8_i--) \
|
|
if (X##_f[_FP_FRAC_CLZ_8_i]) \
|
|
break; \
|
|
__FP_CLZ ((R), X##_f[_FP_FRAC_CLZ_8_i]); \
|
|
(R) += _FP_W_TYPE_SIZE * (7 - _FP_FRAC_CLZ_8_i); \
|
|
} \
|
|
while (0)
|
|
|
|
#define _FP_MINFRAC_8 0, 0, 0, 0, 0, 0, 0, 1
|
|
|
|
#define _FP_FRAC_NEGP_8(X) ((_FP_WS_TYPE) X##_f[7] < 0)
|
|
#define _FP_FRAC_ZEROP_8(X) \
|
|
((X##_f[0] | X##_f[1] | X##_f[2] | X##_f[3] \
|
|
| X##_f[4] | X##_f[5] | X##_f[6] | X##_f[7]) == 0)
|
|
#define _FP_FRAC_HIGHBIT_DW_8(fs, X) \
|
|
(_FP_FRAC_HIGH_DW_##fs (X) & _FP_HIGHBIT_DW_##fs)
|
|
|
|
#define _FP_FRAC_COPY_4_8(D, S) \
|
|
do \
|
|
{ \
|
|
D##_f[0] = S##_f[0]; \
|
|
D##_f[1] = S##_f[1]; \
|
|
D##_f[2] = S##_f[2]; \
|
|
D##_f[3] = S##_f[3]; \
|
|
} \
|
|
while (0)
|
|
|
|
#define _FP_FRAC_COPY_8_4(D, S) \
|
|
do \
|
|
{ \
|
|
D##_f[0] = S##_f[0]; \
|
|
D##_f[1] = S##_f[1]; \
|
|
D##_f[2] = S##_f[2]; \
|
|
D##_f[3] = S##_f[3]; \
|
|
D##_f[4] = D##_f[5] = D##_f[6] = D##_f[7]= 0; \
|
|
} \
|
|
while (0)
|
|
|
|
#define __FP_FRAC_SET_8(X, I7, I6, I5, I4, I3, I2, I1, I0) \
|
|
(X##_f[7] = I7, X##_f[6] = I6, X##_f[5] = I5, X##_f[4] = I4, \
|
|
X##_f[3] = I3, X##_f[2] = I2, X##_f[1] = I1, X##_f[0] = I0)
|
|
|
|
#endif /* !SOFT_FP_OP_8_H */
|