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306c7b1ac3
This patch updates the IEEE 128-bit types used in libgcc. At the moment, we cannot build GCC when the target uses IEEE 128-bit long doubles, such as building the compiler for a native Fedora 36 system. The build dies when it is trying to build the _mulkc3.c and _divkc3 modules. This patch changes libgcc to use long double for the IEEE 128-bit base type if long double is IEEE 128-bit, and it uses _Float128 otherwise. The built-in functions are adjusted to be the correct version based on the IEEE 128-bit base type used. While it is desirable to ultimately have __float128 and _Float128 use the same internal type and mode within GCC, at present if you use the option -mabi=ieeelongdouble, the __float128 type will use the long double type and not the _Float128 type. We get an internal compiler error if we combine the signbitf128 built-in with a long double type. I've gone through several iterations of trying to fix this within GCC, and there are various problems that have come up. I developed this alternative patch that changes libgcc so that it does not tickle the issue. I hope we can fix the compiler at some point, but right now, this is preventing people on Fedora 36 systems from building compilers where the default long double is IEEE 128-bit. 2023-03-06 Michael Meissner <meissner@linux.ibm.com> libgcc/ PR target/107299 * config/rs6000/_divkc3.c (COPYSIGN): Use the correct built-in based on whether long double is IBM or IEEE. (INFINITY): Likewise. (FABS): Likewise. * config/rs6000/_mulkc3.c (COPYSIGN): Likewise. (INFINITY): Likewise. * config/rs6000/quad-float128.h (TF): Remove definition. (TFtype): Define to be long double or _Float128. (TCtype): Define to be _Complex long double or _Complex _Float128. * libgcc2.h (TFtype): Allow machine config files to override this. (TCtype): Likewise. * soft-fp/quad.h (TFtype): Likewise.
329 lines
9.8 KiB
C
329 lines
9.8 KiB
C
/* Software floating-point emulation.
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Definitions for IEEE Quad Precision.
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Copyright (C) 1997-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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In addition to the permissions in the GNU Lesser General Public
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License, the Free Software Foundation gives you unlimited
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permission to link the compiled version of this file into
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combinations with other programs, and to distribute those
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combinations without any restriction coming from the use of this
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file. (The Lesser General Public License restrictions do apply in
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other respects; for example, they cover modification of the file,
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and distribution when not linked into a combine executable.)
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef SOFT_FP_QUAD_H
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#define SOFT_FP_QUAD_H 1
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#if _FP_W_TYPE_SIZE < 32
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# error "Here's a nickel, kid. Go buy yourself a real computer."
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#endif
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#if _FP_W_TYPE_SIZE < 64
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# define _FP_FRACTBITS_Q (4*_FP_W_TYPE_SIZE)
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# define _FP_FRACTBITS_DW_Q (8*_FP_W_TYPE_SIZE)
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#else
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# define _FP_FRACTBITS_Q (2*_FP_W_TYPE_SIZE)
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# define _FP_FRACTBITS_DW_Q (4*_FP_W_TYPE_SIZE)
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#endif
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#define _FP_FRACBITS_Q 113
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#define _FP_FRACXBITS_Q (_FP_FRACTBITS_Q - _FP_FRACBITS_Q)
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#define _FP_WFRACBITS_Q (_FP_WORKBITS + _FP_FRACBITS_Q)
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#define _FP_WFRACXBITS_Q (_FP_FRACTBITS_Q - _FP_WFRACBITS_Q)
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#define _FP_EXPBITS_Q 15
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#define _FP_EXPBIAS_Q 16383
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#define _FP_EXPMAX_Q 32767
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#define _FP_QNANBIT_Q \
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((_FP_W_TYPE) 1 << (_FP_FRACBITS_Q-2) % _FP_W_TYPE_SIZE)
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#define _FP_QNANBIT_SH_Q \
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((_FP_W_TYPE) 1 << (_FP_FRACBITS_Q-2+_FP_WORKBITS) % _FP_W_TYPE_SIZE)
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#define _FP_IMPLBIT_Q \
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((_FP_W_TYPE) 1 << (_FP_FRACBITS_Q-1) % _FP_W_TYPE_SIZE)
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#define _FP_IMPLBIT_SH_Q \
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((_FP_W_TYPE) 1 << (_FP_FRACBITS_Q-1+_FP_WORKBITS) % _FP_W_TYPE_SIZE)
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#define _FP_OVERFLOW_Q \
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((_FP_W_TYPE) 1 << (_FP_WFRACBITS_Q % _FP_W_TYPE_SIZE))
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#define _FP_WFRACBITS_DW_Q (2 * _FP_WFRACBITS_Q)
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#define _FP_WFRACXBITS_DW_Q (_FP_FRACTBITS_DW_Q - _FP_WFRACBITS_DW_Q)
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#define _FP_HIGHBIT_DW_Q \
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((_FP_W_TYPE) 1 << (_FP_WFRACBITS_DW_Q - 1) % _FP_W_TYPE_SIZE)
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#ifndef TFtype
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typedef float TFtype __attribute__ ((mode (TF)));
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#endif
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#if _FP_W_TYPE_SIZE < 64
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union _FP_UNION_Q
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{
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TFtype flt;
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struct _FP_STRUCT_LAYOUT
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{
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# if __BYTE_ORDER == __BIG_ENDIAN
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unsigned sign : 1;
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unsigned exp : _FP_EXPBITS_Q;
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unsigned long frac3 : _FP_FRACBITS_Q - (_FP_IMPLBIT_Q != 0)-(_FP_W_TYPE_SIZE * 3);
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unsigned long frac2 : _FP_W_TYPE_SIZE;
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unsigned long frac1 : _FP_W_TYPE_SIZE;
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unsigned long frac0 : _FP_W_TYPE_SIZE;
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# else
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unsigned long frac0 : _FP_W_TYPE_SIZE;
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unsigned long frac1 : _FP_W_TYPE_SIZE;
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unsigned long frac2 : _FP_W_TYPE_SIZE;
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unsigned long frac3 : _FP_FRACBITS_Q - (_FP_IMPLBIT_Q != 0)-(_FP_W_TYPE_SIZE * 3);
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unsigned exp : _FP_EXPBITS_Q;
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unsigned sign : 1;
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# endif /* not bigendian */
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} bits;
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};
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# define FP_DECL_Q(X) _FP_DECL (4, X)
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# define FP_UNPACK_RAW_Q(X, val) _FP_UNPACK_RAW_4 (Q, X, (val))
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# define FP_UNPACK_RAW_QP(X, val) _FP_UNPACK_RAW_4_P (Q, X, (val))
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# define FP_PACK_RAW_Q(val, X) _FP_PACK_RAW_4 (Q, (val), X)
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# define FP_PACK_RAW_QP(val, X) \
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do \
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{ \
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if (!FP_INHIBIT_RESULTS) \
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_FP_PACK_RAW_4_P (Q, (val), X); \
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} \
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while (0)
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# define FP_UNPACK_Q(X, val) \
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do \
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{ \
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_FP_UNPACK_RAW_4 (Q, X, (val)); \
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_FP_UNPACK_CANONICAL (Q, 4, X); \
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} \
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while (0)
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# define FP_UNPACK_QP(X, val) \
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do \
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{ \
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_FP_UNPACK_RAW_4_P (Q, X, (val)); \
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_FP_UNPACK_CANONICAL (Q, 4, X); \
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} \
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while (0)
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# define FP_UNPACK_SEMIRAW_Q(X, val) \
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do \
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{ \
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_FP_UNPACK_RAW_4 (Q, X, (val)); \
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_FP_UNPACK_SEMIRAW (Q, 4, X); \
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} \
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while (0)
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# define FP_UNPACK_SEMIRAW_QP(X, val) \
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do \
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{ \
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_FP_UNPACK_RAW_4_P (Q, X, (val)); \
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_FP_UNPACK_SEMIRAW (Q, 4, X); \
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} \
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while (0)
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# define FP_PACK_Q(val, X) \
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do \
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{ \
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_FP_PACK_CANONICAL (Q, 4, X); \
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_FP_PACK_RAW_4 (Q, (val), X); \
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} \
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while (0)
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# define FP_PACK_QP(val, X) \
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do \
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{ \
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_FP_PACK_CANONICAL (Q, 4, X); \
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if (!FP_INHIBIT_RESULTS) \
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_FP_PACK_RAW_4_P (Q, (val), X); \
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} \
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while (0)
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# define FP_PACK_SEMIRAW_Q(val, X) \
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do \
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{ \
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_FP_PACK_SEMIRAW (Q, 4, X); \
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_FP_PACK_RAW_4 (Q, (val), X); \
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} \
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while (0)
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# define FP_PACK_SEMIRAW_QP(val, X) \
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do \
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{ \
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_FP_PACK_SEMIRAW (Q, 4, X); \
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if (!FP_INHIBIT_RESULTS) \
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_FP_PACK_RAW_4_P (Q, (val), X); \
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} \
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while (0)
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# define FP_ISSIGNAN_Q(X) _FP_ISSIGNAN (Q, 4, X)
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# define FP_NEG_Q(R, X) _FP_NEG (Q, 4, R, X)
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# define FP_ADD_Q(R, X, Y) _FP_ADD (Q, 4, R, X, Y)
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# define FP_SUB_Q(R, X, Y) _FP_SUB (Q, 4, R, X, Y)
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# define FP_MUL_Q(R, X, Y) _FP_MUL (Q, 4, R, X, Y)
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# define FP_DIV_Q(R, X, Y) _FP_DIV (Q, 4, R, X, Y)
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# define FP_SQRT_Q(R, X) _FP_SQRT (Q, 4, R, X)
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# define _FP_SQRT_MEAT_Q(R, S, T, X, Q) _FP_SQRT_MEAT_4 (R, S, T, X, (Q))
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# define FP_FMA_Q(R, X, Y, Z) _FP_FMA (Q, 4, 8, R, X, Y, Z)
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# define FP_CMP_Q(r, X, Y, un, ex) _FP_CMP (Q, 4, (r), X, Y, (un), (ex))
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# define FP_CMP_EQ_Q(r, X, Y, ex) _FP_CMP_EQ (Q, 4, (r), X, Y, (ex))
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# define FP_CMP_UNORD_Q(r, X, Y, ex) _FP_CMP_UNORD (Q, 4, (r), X, Y, (ex))
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# define FP_TO_INT_Q(r, X, rsz, rsg) _FP_TO_INT (Q, 4, (r), X, (rsz), (rsg))
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# define FP_TO_INT_ROUND_Q(r, X, rsz, rsg) \
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_FP_TO_INT_ROUND (Q, 4, (r), X, (rsz), (rsg))
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# define FP_FROM_INT_Q(X, r, rs, rt) _FP_FROM_INT (Q, 4, X, (r), (rs), rt)
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# define _FP_FRAC_HIGH_Q(X) _FP_FRAC_HIGH_4 (X)
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# define _FP_FRAC_HIGH_RAW_Q(X) _FP_FRAC_HIGH_4 (X)
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# define _FP_FRAC_HIGH_DW_Q(X) _FP_FRAC_HIGH_8 (X)
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#else /* not _FP_W_TYPE_SIZE < 64 */
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union _FP_UNION_Q
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{
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TFtype flt /* __attribute__ ((mode (TF))) */ ;
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struct _FP_STRUCT_LAYOUT
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{
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_FP_W_TYPE a, b;
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} longs;
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struct _FP_STRUCT_LAYOUT
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{
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# if __BYTE_ORDER == __BIG_ENDIAN
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unsigned sign : 1;
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unsigned exp : _FP_EXPBITS_Q;
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_FP_W_TYPE frac1 : _FP_FRACBITS_Q - (_FP_IMPLBIT_Q != 0) - _FP_W_TYPE_SIZE;
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_FP_W_TYPE frac0 : _FP_W_TYPE_SIZE;
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# else
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_FP_W_TYPE frac0 : _FP_W_TYPE_SIZE;
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_FP_W_TYPE frac1 : _FP_FRACBITS_Q - (_FP_IMPLBIT_Q != 0) - _FP_W_TYPE_SIZE;
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unsigned exp : _FP_EXPBITS_Q;
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unsigned sign : 1;
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# endif
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} bits;
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};
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# define FP_DECL_Q(X) _FP_DECL (2, X)
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# define FP_UNPACK_RAW_Q(X, val) _FP_UNPACK_RAW_2 (Q, X, (val))
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# define FP_UNPACK_RAW_QP(X, val) _FP_UNPACK_RAW_2_P (Q, X, (val))
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# define FP_PACK_RAW_Q(val, X) _FP_PACK_RAW_2 (Q, (val), X)
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# define FP_PACK_RAW_QP(val, X) \
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do \
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{ \
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if (!FP_INHIBIT_RESULTS) \
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_FP_PACK_RAW_2_P (Q, (val), X); \
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} \
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while (0)
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# define FP_UNPACK_Q(X, val) \
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do \
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{ \
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_FP_UNPACK_RAW_2 (Q, X, (val)); \
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_FP_UNPACK_CANONICAL (Q, 2, X); \
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} \
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while (0)
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# define FP_UNPACK_QP(X, val) \
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do \
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{ \
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_FP_UNPACK_RAW_2_P (Q, X, (val)); \
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_FP_UNPACK_CANONICAL (Q, 2, X); \
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} \
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while (0)
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# define FP_UNPACK_SEMIRAW_Q(X, val) \
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do \
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{ \
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_FP_UNPACK_RAW_2 (Q, X, (val)); \
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_FP_UNPACK_SEMIRAW (Q, 2, X); \
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} \
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while (0)
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# define FP_UNPACK_SEMIRAW_QP(X, val) \
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do \
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{ \
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_FP_UNPACK_RAW_2_P (Q, X, (val)); \
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_FP_UNPACK_SEMIRAW (Q, 2, X); \
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} \
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while (0)
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# define FP_PACK_Q(val, X) \
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do \
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{ \
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_FP_PACK_CANONICAL (Q, 2, X); \
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_FP_PACK_RAW_2 (Q, (val), X); \
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} \
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while (0)
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# define FP_PACK_QP(val, X) \
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do \
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{ \
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_FP_PACK_CANONICAL (Q, 2, X); \
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if (!FP_INHIBIT_RESULTS) \
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_FP_PACK_RAW_2_P (Q, (val), X); \
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} \
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while (0)
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# define FP_PACK_SEMIRAW_Q(val, X) \
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do \
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{ \
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_FP_PACK_SEMIRAW (Q, 2, X); \
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_FP_PACK_RAW_2 (Q, (val), X); \
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} \
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while (0)
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# define FP_PACK_SEMIRAW_QP(val, X) \
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do \
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{ \
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_FP_PACK_SEMIRAW (Q, 2, X); \
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if (!FP_INHIBIT_RESULTS) \
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_FP_PACK_RAW_2_P (Q, (val), X); \
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} \
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while (0)
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# define FP_ISSIGNAN_Q(X) _FP_ISSIGNAN (Q, 2, X)
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# define FP_NEG_Q(R, X) _FP_NEG (Q, 2, R, X)
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# define FP_ADD_Q(R, X, Y) _FP_ADD (Q, 2, R, X, Y)
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# define FP_SUB_Q(R, X, Y) _FP_SUB (Q, 2, R, X, Y)
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# define FP_MUL_Q(R, X, Y) _FP_MUL (Q, 2, R, X, Y)
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# define FP_DIV_Q(R, X, Y) _FP_DIV (Q, 2, R, X, Y)
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# define FP_SQRT_Q(R, X) _FP_SQRT (Q, 2, R, X)
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# define _FP_SQRT_MEAT_Q(R, S, T, X, Q) _FP_SQRT_MEAT_2 (R, S, T, X, (Q))
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# define FP_FMA_Q(R, X, Y, Z) _FP_FMA (Q, 2, 4, R, X, Y, Z)
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# define FP_CMP_Q(r, X, Y, un, ex) _FP_CMP (Q, 2, (r), X, Y, (un), (ex))
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# define FP_CMP_EQ_Q(r, X, Y, ex) _FP_CMP_EQ (Q, 2, (r), X, Y, (ex))
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# define FP_CMP_UNORD_Q(r, X, Y, ex) _FP_CMP_UNORD (Q, 2, (r), X, Y, (ex))
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# define FP_TO_INT_Q(r, X, rsz, rsg) _FP_TO_INT (Q, 2, (r), X, (rsz), (rsg))
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# define FP_TO_INT_ROUND_Q(r, X, rsz, rsg) \
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_FP_TO_INT_ROUND (Q, 2, (r), X, (rsz), (rsg))
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# define FP_FROM_INT_Q(X, r, rs, rt) _FP_FROM_INT (Q, 2, X, (r), (rs), rt)
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# define _FP_FRAC_HIGH_Q(X) _FP_FRAC_HIGH_2 (X)
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# define _FP_FRAC_HIGH_RAW_Q(X) _FP_FRAC_HIGH_2 (X)
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# define _FP_FRAC_HIGH_DW_Q(X) _FP_FRAC_HIGH_4 (X)
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#endif /* not _FP_W_TYPE_SIZE < 64 */
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#endif /* !SOFT_FP_QUAD_H */
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