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// Copyright (c) 2025 taitep
// SPDX-License-Identifier: MIT
//
// This file is part of TRVE (https://gitea.taitep.se/taitep/trve)
// See LICENSE file in the project root for full license text.
mod rvi;
use crate::{
core::{Core, InstructionResult},
decode::Instruction,
};
pub(crate) fn find_and_exec(instr: Instruction, core: &mut Core) -> Option<InstructionResult> {
match instr.opcode_noncompressed() {
0b01100 => match (instr.funct7(), instr.funct3()) {
// OP
(0b0000000, 0b000) => Some(rvi::add(core, instr)),
(0b0100000, 0b000) => Some(rvi::sub(core, instr)),
(0b0000000, 0b111) => Some(rvi::and(core, instr)),
(0b0000000, 0b110) => Some(rvi::or(core, instr)),
_ => None,
},
0b00100 => match instr.funct3() {
// OP_IMM
0b000 => Some(rvi::addi(core, instr)),
0b001 => (instr.funct6() == 0).then(|| rvi::slli(core, instr)),
0b101 => match instr.funct6() {
// immediate right-shift
0b000000 => Some(rvi::srli(core, instr)),
_ => None,
},
0b111 => Some(rvi::andi(core, instr)),
_ => None,
},
0b00110 => match instr.funct3() {
// OP_IMM_32
0b000 => Some(rvi::addiw(core, instr)),
_ => None,
},
0b01000 => match instr.funct3() {
// STORE
0b000 => Some(rvi::sb(core, instr)),
0b001 => Some(rvi::sh(core, instr)),
0b010 => Some(rvi::sw(core, instr)),
0b011 => Some(rvi::sd(core, instr)),
_ => None,
},
0b00000 => match instr.funct3() {
// LOAD
0b000 => Some(rvi::lb(core, instr)),
0b100 => Some(rvi::lbu(core, instr)),
0b001 => Some(rvi::lh(core, instr)),
0b010 => Some(rvi::lw(core, instr)),
0b011 => Some(rvi::ld(core, instr)),
_ => None,
},
0b11000 => match instr.funct3() {
// BRANCH
0b000 => Some(rvi::beq(core, instr)),
0b001 => Some(rvi::bne(core, instr)),
0b100 => Some(rvi::blt(core, instr)),
0b110 => Some(rvi::bltu(core, instr)),
0b111 => Some(rvi::bgeu(core, instr)),
_ => None,
},
0b01101 => Some(rvi::lui(core, instr)),
0b00101 => Some(rvi::auipc(core, instr)),
0b11011 => Some(rvi::jal(core, instr)),
0b11001 => (instr.funct3() == 0).then(|| rvi::jalr(core, instr)),
_ => None,
}
}
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