gcc/libgcc/soft-fp/floatunsibf.c

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[RISC-V] Add support for _Bfloat16 1 At point <https://github.com/riscv/riscv-bfloat16>, BF16 has already been completed "post public review". 2 LLVM has also added support for RISCV BF16 in <https://reviews.llvm.org/D151313> and <https://reviews.llvm.org/D150929>. 3 According to the discussion <https://github.com/riscv-non-isa/riscv-elf-psabi-doc/pull/367>, this use __bf16 and use DF16b in riscv_mangle_type like x86. Below test are passed for this patch * The riscv fully regression test. gcc/ChangeLog: * config/riscv/iterators.md: New mode iterator HFBF. * config/riscv/riscv-builtins.cc (riscv_init_builtin_types): Initialize data type _Bfloat16. * config/riscv/riscv-modes.def (FLOAT_MODE): New. (ADJUST_FLOAT_FORMAT): New. * config/riscv/riscv.cc (riscv_mangle_type): Support for BFmode. (riscv_scalar_mode_supported_p): Ditto. (riscv_libgcc_floating_mode_supported_p): Ditto. (riscv_init_libfuncs): Set the conversion method for BFmode and HFmode. (riscv_block_arith_comp_libfuncs_for_mode): Set the arithmetic and comparison libfuncs for the mode. * config/riscv/riscv.md (mode" ): Add BF. (movhf): Support for BFmode. (mov<mode>): Ditto. (*movhf_softfloat): Ditto. (*mov<mode>_softfloat): Ditto. libgcc/ChangeLog: * config/riscv/sfp-machine.h (_FP_NANFRAC_B): New. (_FP_NANSIGN_B): Ditto. * config/riscv/t-softfp32: Add support for BF16 libfuncs. * config/riscv/t-softfp64: Ditto. * soft-fp/floatsibf.c: For si -> bf16. * soft-fp/floatunsibf.c: For unsi -> bf16. gcc/testsuite/ChangeLog: * gcc.target/riscv/bf16_arithmetic.c: New test. * gcc.target/riscv/bf16_call.c: New test. * gcc.target/riscv/bf16_comparison.c: New test. * gcc.target/riscv/bf16_float_libcall_convert.c: New test. * gcc.target/riscv/bf16_integer_libcall_convert.c: New test. Co-authored-by: Jin Ma <jinma@linux.alibaba.com>
2024-05-06 15:39:12 -06:00
/* Software floating-point emulation.
Convert a 32bit unsigned integer to bfloat16
Copyright (C) 2007-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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
<https://www.gnu.org/licenses/>. */
#include "soft-fp.h"
#include "brain.h"
BFtype
__floatunsibf (USItype i)
{
FP_DECL_EX;
FP_DECL_B (A);
BFtype a;
FP_INIT_ROUNDMODE;
FP_FROM_INT_B (A, i, SI_BITS, USItype);
FP_PACK_RAW_B (a, A);
FP_HANDLE_EXCEPTIONS;
return a;
}