gcc/libgcc/config/libbid/_hf_to_td.c

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2023-01-16 11:50:43 +01:00
/* Copyright (C) 2022-2023 Free Software Foundation, Inc.
libgcc: Add support for HF mode (aka _Float16) in libbid This patch adds support for trunc and extend operations between HF mode (_Float16) and Decimal Floating Point formats (_Decimal32, _Decimal64 and _Decimal128). For simplicity we rely on the implicit conversions inserted by the compiler between HF and SD/DF/TF modes. The existing bid*_to_binary* and binary*_to_bid* functions are non-trivial and at this stage it is not clear if there is a performance-critical use case involving _Float16 and _Decimal* formats. The patch also adds two executable tests, to make sure the right functions are called, available (link phase) and functional. Tested on aarch64 and x86_64. The number of symbol matches in the testcases includes the .global XXX to avoid having to match different call instructions for different targets. 2022-05-04 Christophe Lyon <christophe.lyon@arm.com> libgcc/ChangeLog: * Makefile.in (D32PBIT_FUNCS): Add _hf_to_sd and _sd_to_hf. (D64PBIT_FUNCS): Add _hf_to_dd and _dd_to_hf. (D128PBIT_FUNCS): Add _hf_to_td _td_to_hf. libgcc/config/libbid/ChangeLog: * bid_gcc_intrinsics.h (LIBGCC2_HAS_HF_MODE): Define according to __LIBGCC_HAS_HF_MODE__. (BID_HAS_HF_MODE): Define. (HFtype): Define. (__bid_extendhfsd): New prototype. (__bid_extendhfdd): Likewise. (__bid_extendhftd): Likewise. (__bid_truncsdhf): Likewise. (__bid_truncddhf): Likewise. (__bid_trunctdhf): Likewise. * _dd_to_hf.c: New file. * _hf_to_dd.c: New file. * _hf_to_sd.c: New file. * _hf_to_td.c: New file. * _sd_to_hf.c: New file. * _td_to_hf.c: New file. gcc/testsuite/ChangeLog: * gcc.dg/torture/convert-dfp-2.c: New test. * gcc.dg/torture/convert-dfp.c: New test.
2022-05-04 16:13:35 +01:00
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC 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 General Public License
for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#include "bid_conf.h"
#include "bid_functions.h"
#include "bid_gcc_intrinsics.h"
#if LIBGCC2_HAS_HF_MODE || BID_HAS_HF_MODE
_Decimal128
__bid_extendhftd (HFtype x) {
union decimal128 res;
SFtype xsf = x;
res.i = __binary32_to_bid128 (xsf);
return (res.d);
}
#endif