[PATCH v2 0/2] Basic support for the Ventana VT1 w/ instruction fusion

[Philipp Tomsich <philipp.tomsich@vrull.eu>]

This series provides support for the Ventana VT1 (a 4-way superscalar
rv64gc_zba_zbb_zbc_zbs_zifenci_xventanacondops core) including support
for the supported instruction fusion patterns.

This includes the addition of the fusion-aware scheduling
infrastructure for RISC-V and implements idiom recognition for the
fusion patterns supported by VT1.

Note that we don't signal support for XVentanaCondOps at this point,
as the XVentanaCondOps support is in-flight separately.  Changing the
defaults for VT1 can happen late in the cycle, so no need to link the
two different changesets.

Changes in v2:
- Rebased and changed over to .rst-based documentation
- Updated to catch more fusion cases
- Signals support for Zifencei

Philipp Tomsich (2):
  RISC-V: Add basic support for the Ventana-VT1 core
  RISC-V: Add instruction fusion (for ventana-vt1)

 gcc/config/riscv/riscv-cores.def              |   3 +
 gcc/config/riscv/riscv-opts.h                 |   2 +-
 gcc/config/riscv/riscv.cc                     | 233 ++++++++++++++++++
 .../risc-v-options.rst                        |   5 +-
 4 files changed, 240 insertions(+), 3 deletions(-)

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2.34.1