[PATCH v2 0/1] [RISC-V] Add support for _Bfloat16

[Xiao Zeng <zengxiao@eswincomputing.com>]

Hi all RISC-V folks:

This patch completes the support for the bf16 data type in the
riscv architecture.On this basis, there will be a series of
patches in the future to strengthen support for BF16.

It is recommended to first review this patch from the testcases,
where detailed explanations have been provided on the flow of
data type conversion.

The basis of this patch is: <https://gcc.gnu.org/pipermail/gcc-patches/2023-September/630858.html>

The website for the first patch submission is: <https://gcc.gnu.org/pipermail/gcc-patches/2024-March/648517.html>

However, considering the non-standard commit information, this
submission was made.

Patch v2 fixed failed test cases.

*** BLURB HERE ***

Xiao Zeng (1):
  [RISC-V] Add support for _Bfloat16

 gcc/config/riscv/iterators.md                 |  2 +
 gcc/config/riscv/riscv-builtins.cc            | 16 ++++
 gcc/config/riscv/riscv-modes.def              |  3 +
 gcc/config/riscv/riscv.cc                     | 64 ++++++++++-----
 gcc/config/riscv/riscv.md                     | 24 +++---
 .../gcc.target/riscv/bf16_arithmetic.c        | 42 ++++++++++
 gcc/testsuite/gcc.target/riscv/bf16_call.c    | 12 +++
 .../gcc.target/riscv/bf16_comparison.c        | 36 +++++++++
 .../riscv/bf16_float_libcall_convert.c        | 57 +++++++++++++
 .../riscv/bf16_integer_libcall_convert.c      | 81 +++++++++++++++++++
 libgcc/config/riscv/sfp-machine.h             |  3 +
 libgcc/config/riscv/t-softfp32                | 10 ++-
 libgcc/config/riscv/t-softfp64                |  3 +-
 libgcc/soft-fp/floatsibf.c                    | 45 +++++++++++
 libgcc/soft-fp/floatunsibf.c                  | 45 +++++++++++
 15 files changed, 407 insertions(+), 36 deletions(-)
 create mode 100644 gcc/testsuite/gcc.target/riscv/bf16_arithmetic.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/bf16_call.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/bf16_comparison.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/bf16_float_libcall_convert.c
 create mode 100644 gcc/testsuite/gcc.target/riscv/bf16_integer_libcall_convert.c
 create mode 100644 libgcc/soft-fp/floatsibf.c
 create mode 100644 libgcc/soft-fp/floatunsibf.c

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2.17.1