[REVIEW ONLY 0/4] UNRATIFIED RISC-V: Add support for BFloat16 extensions

[Tsukasa OI]

Hello,

This patch set implements three extensions in the RISC-V BF16 Extensions
specification:
<https://github.com/riscv/riscv-bfloat16/commit/5578e34e15a44e9ad13246072a29f51274b4d999>

Each patch implements following extensions one by one (PATCH 1-3/4).

1.  'Zfbfmin' (scalar BF16 conversion extension)
2.  'Zvfbfmin' (vector BF16 narrowing/widening conversion-only extension)
3.  'Zvfbfwma' (vector BF16 widening multiply-accumlate extension)

The extension versions are set to "0.8" as in the documentation
(not final "1.0").

Although it's small, it covers some of important machine learning workloads
(especially 'Zvfbfwma' extension).  I hope this patch set helps testing
this draft extension on the simulator.

PATCH 4/4 is a tentative support of an assembler directive: ".bfloat16".
Although not included in the RISC-V Assembly Programmer's Manual, the final
assembler directive will be likely ".bfloat16" (like x86 and AArch64).
Test cases are ported from AArch64.

Thanks,
Tsukasa




Tsukasa OI (4):
  UNRATIFIED RISC-V: Add 'Zfbfmin' extension
  UNRATIFIED RISC-V: Add 'Zvfbfmin' extension
  UNRATIFIED RISC-V: Add 'Zvfbfwma' extension
  RISC-V: Tentative ".bfloat16" assembly support

 bfd/elfxx-riscv.c                     | 24 ++++++++++++++++++++++--
 gas/config/tc-riscv.c                 |  3 ++-
 gas/testsuite/gas/riscv/bfloat16-be.d | 10 ++++++++++
 gas/testsuite/gas/riscv/bfloat16-le.d | 10 ++++++++++
 gas/testsuite/gas/riscv/bfloat16.s    | 19 +++++++++++++++++++
 gas/testsuite/gas/riscv/zfbfmin.d     | 15 +++++++++++++++
 gas/testsuite/gas/riscv/zfbfmin.s     | 10 ++++++++++
 gas/testsuite/gas/riscv/zvfbfmin.d    | 12 ++++++++++++
 gas/testsuite/gas/riscv/zvfbfmin.s    |  5 +++++
 gas/testsuite/gas/riscv/zvfbfwma.d    | 12 ++++++++++++
 gas/testsuite/gas/riscv/zvfbfwma.s    |  5 +++++
 include/opcode/riscv-opc.h            | 24 ++++++++++++++++++++++++
 include/opcode/riscv.h                |  3 +++
 opcodes/riscv-opc.c                   | 13 +++++++++++++
 14 files changed, 162 insertions(+), 3 deletions(-)
 create mode 100644 gas/testsuite/gas/riscv/bfloat16-be.d
 create mode 100644 gas/testsuite/gas/riscv/bfloat16-le.d
 create mode 100644 gas/testsuite/gas/riscv/bfloat16.s
 create mode 100644 gas/testsuite/gas/riscv/zfbfmin.d
 create mode 100644 gas/testsuite/gas/riscv/zfbfmin.s
 create mode 100644 gas/testsuite/gas/riscv/zvfbfmin.d
 create mode 100644 gas/testsuite/gas/riscv/zvfbfmin.s
 create mode 100644 gas/testsuite/gas/riscv/zvfbfwma.d
 create mode 100644 gas/testsuite/gas/riscv/zvfbfwma.s


base-commit: 4b177a76d5b759ba631568fb69e8750e99b43647
-- 
2.41.0