From 8c7cee80eb50792e57d514be1418c453ddd1073e Mon Sep 17 00:00:00 2001 From: Xiao Zeng Date: Mon, 6 May 2024 15:39:12 -0600 Subject: [RISC-V] Add support for _Bfloat16 1 At point , BF16 has already been completed "post public review". 2 LLVM has also added support for RISCV BF16 in and . 3 According to the discussion , 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): Ditto. (*movhf_softfloat): Ditto. (*mov_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 --- libgcc/soft-fp/floatsibf.c | 45 ++++++++++++++++++++++++++++++++++++++++++++ libgcc/soft-fp/floatunsibf.c | 45 ++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 90 insertions(+) create mode 100644 libgcc/soft-fp/floatsibf.c create mode 100644 libgcc/soft-fp/floatunsibf.c (limited to 'libgcc/soft-fp') diff --git a/libgcc/soft-fp/floatsibf.c b/libgcc/soft-fp/floatsibf.c new file mode 100644 index 0000000..0cb05e5 --- /dev/null +++ b/libgcc/soft-fp/floatsibf.c @@ -0,0 +1,45 @@ +/* Software floating-point emulation. + Convert a 32bit signed integer to bfloat16 + Copyright (C) 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 + . */ + +#include "soft-fp.h" +#include "brain.h" + +BFtype +__floatsibf (SItype 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; +} diff --git a/libgcc/soft-fp/floatunsibf.c b/libgcc/soft-fp/floatunsibf.c new file mode 100644 index 0000000..cd8c4bc --- /dev/null +++ b/libgcc/soft-fp/floatunsibf.c @@ -0,0 +1,45 @@ +/* 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 + . */ + +#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; +} -- cgit v1.1