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f172b9d38d
The following patch adds the missing
{unsigned ,}__int128 <-> _Decimal{32,64,128}
conversion support into libgcc.a on top of the _BitInt support
(doing it without that would be larger amount of code and I hope all
the targets which support __int128 will eventually support _BitInt,
after all it is a required part of C23) and because it is in libgcc.a
only, it doesn't hurt that much if it is added for some architectures
only in GCC 15.
Initially I thought about doing this on the compiler side, but doing
it on the library side seems to be easier and more -Os friendly.
The tests currently require bitint effective target, that can be
removed when all the int128 targets support bitint.
2023-11-09 Jakub Jelinek <jakub@redhat.com>
PR libgcc/65833
libgcc/
* config/t-softfp (softfp_bid_list): Add
{U,}TItype <-> _Decimal{32,64,128} conversions.
* soft-fp/floattisd.c: New file.
* soft-fp/floattidd.c: New file.
* soft-fp/floattitd.c: New file.
* soft-fp/floatuntisd.c: New file.
* soft-fp/floatuntidd.c: New file.
* soft-fp/floatuntitd.c: New file.
* soft-fp/fixsdti.c: New file.
* soft-fp/fixddti.c: New file.
* soft-fp/fixtdti.c: New file.
* soft-fp/fixunssdti.c: New file.
* soft-fp/fixunsddti.c: New file.
* soft-fp/fixunstdti.c: New file.
gcc/testsuite/
* gcc.dg/dfp/int128-1.c: New test.
* gcc.dg/dfp/int128-2.c: New test.
* gcc.dg/dfp/int128-3.c: New test.
* gcc.dg/dfp/int128-4.c: New test.
54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
/* Software floating-point emulation.
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Convert a 128bit unsigned integer to _Decimal64.
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Copyright (C) 2023 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "soft-fp.h"
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#include "bitint.h"
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#if defined(__BITINT_MAXWIDTH__) && defined(__SIZEOF_INT128__)
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extern _Decimal64 __bid_floatbitintdd (const UBILtype *, SItype);
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extern _Decimal64 __bid_floatunstidd (UTItype);
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_Decimal64
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__bid_floatunstidd (UTItype i)
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{
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UBILtype ib[128 / BIL_TYPE_SIZE];
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#if BIL_TYPE_SIZE == 128
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ib[0] = i;
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#elif BIL_TYPE_SIZE == 64
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ib[BITINT_END (0, 1)] = i >> 64;
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ib[BITINT_END (1, 0)] = i;
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#elif BIL_TYPE_SIZE == 32
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ib[BITINT_END (0, 3)] = i >> 96;
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ib[BITINT_END (1, 2)] = i >> 64;
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ib[BITINT_END (2, 1)] = i >> 32;
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ib[BITINT_END (3, 0)] = i;
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#else
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#error Unsupported UBILtype
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#endif
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return __bid_floatbitintdd (ib, 128);
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}
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#endif
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