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>
8c7cee80eb