ibex_configs.yaml

# Copyright lowRISC contributors.
# Licensed under the Apache License, Version 2.0, see LICENSE for details.
# SPDX-License-Identifier: Apache-2.0

# Ibex configurations files, holds the parameter sets that are tested under CI.
# Each configuration must specify the same set of parameters

# Two-stage pipeline without additional branch target ALU and 3 cycle multiplier
# (4 cycles for mulh), resulting in 2 stall cycles for mul (3 for mulh)
small-3cmult:
  RV32E                    : 0
  RV32M                    : 1
  RV32B                    : 0
  BranchTargetALU          : 0
  WritebackStage           : 0
  MultiplierImplementation : "fast"

# ===============================
# * EXPERIMENTAL CONFIGURATIONS *
# ===============================

# Three-stage pipeline with additional branch traget ALU and 1 cycle multiplier
# (2 cycles for mulh) so mul does not stall (mulh stall 1 cycles). This is the
# maximum performance configuration.
experimental-maxperf-1cmult:
  RV32E                    : 0
  RV32M                    : 1
  RV32B                    : 0
  BranchTargetALU          : 1
  WritebackStage           : 1
  MultiplierImplementation : "single-cycle"

# maxpref-1cmult config above with bitmanip extension
experimental-maxperf-bm-1cmult:
  RV32E                    : 0
  RV32M                    : 1
  RV32B                    : 1
  BranchTargetALU          : 1
  WritebackStage           : 1
  MultiplierImplementation : "single-cycle"