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13071c3c7d
x86_64/i686 has for a few months working std::bfloat16_t support, __bf16
there is no longer a storage only type, but can be used for arithmetics
and is supported in libgcc and libstdc++.
The following patch adds similar support for AArch64.
Unlike the x86 changes, this one keeps the old __bf16 mangling of
u6__bf16 rather than DF16b (so an exception from Itanium ABI), but
otherwise __bf16 and decltype (0.0bf16) are the same type and both
in C++ act as extended floating-point type.
2023-03-13 Jakub Jelinek <jakub@redhat.com>
gcc/
* config/aarch64/aarch64.h (aarch64_bf16_type_node): Remove.
(aarch64_bf16_ptr_type_node): Adjust comment.
* config/aarch64/aarch64.cc (aarch64_gimplify_va_arg_expr): Use
bfloat16_type_node rather than aarch64_bf16_type_node.
(aarch64_libgcc_floating_mode_supported_p,
aarch64_scalar_mode_supported_p): Also support BFmode.
(aarch64_invalid_conversion, aarch64_invalid_unary_op): Remove.
(aarch64_invalid_binary_op): Remove BFmode related rejections.
(TARGET_INVALID_CONVERSION, TARGET_INVALID_UNARY_OP): Don't redefine.
* config/aarch64/aarch64-builtins.cc (aarch64_bf16_type_node): Remove.
(aarch64_int_or_fp_type): Use bfloat16_type_node rather than
aarch64_bf16_type_node.
(aarch64_init_simd_builtin_types): Likewise.
(aarch64_init_bf16_types): Likewise. Don't create bfloat16_type_node,
which is created in tree.cc already.
* config/aarch64/aarch64-sve-builtins.def (svbfloat16_t): Likewise.
gcc/testsuite/
* gcc.target/aarch64/sve/acle/general-c/ternary_bfloat16_opt_n_1.c:
Don't expect one __bf16 related error.
* gcc.target/aarch64/bfloat16_vector_typecheck_1.c: Adjust or remove
dg-error directives for __bf16 being an extended arithmetic type.
* gcc.target/aarch64/bfloat16_vector_typecheck_2.c: Likewise.
* gcc.target/aarch64/bfloat16_scalar_typecheck.c: Likewise.
* g++.target/aarch64/bfloat_cpp_typecheck.C: Don't expect two __bf16
related errors.
libgcc/
* config/aarch64/t-softfp (softfp_extensions): Add bfsf.
(softfp_truncations): Add tfbf dfbf sfbf hfbf.
(softfp_extras): Add floatdibf floatundibf floattibf floatuntibf.
* config/aarch64/libgcc-softfp.ver (GCC_13.0.0): Export
__extendbfsf2 and __trunc{s,d,t,h}fbf2.
* config/aarch64/sfp-machine.h (_FP_NANFRAC_B, _FP_NANSIGN_B): Define.
* soft-fp/floatundibf.c: New file.
* soft-fp/floatdibf.c: New file.
libstdc++-v3/
* config/abi/pre/gnu.ver (CXXABI_1.3.14): Also export __bf16 tinfos
if it isn't mangled as DF16b but u6__bf16.
46 lines
1.6 KiB
C
46 lines
1.6 KiB
C
/* Software floating-point emulation.
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Convert a 64bit unsigned integer to bfloat16
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Copyright (C) 2007-2023 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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#include "soft-fp.h"
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#include "brain.h"
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BFtype
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__floatundibf (UDItype i)
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{
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FP_DECL_EX;
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FP_DECL_B (A);
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BFtype a;
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FP_INIT_ROUNDMODE;
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FP_FROM_INT_B (A, i, DI_BITS, UDItype);
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FP_PACK_RAW_B (a, A);
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FP_HANDLE_EXCEPTIONS;
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return a;
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}
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