HiSimu Project

High-Speed Simulator with document style code for instruction behavior, see the code in arch/riscv/isa-def/.

高速文档式行为模型，目标是拥有文档一般的可读性和翻译执行的速度，目标速度500+MIPS。 实现这个目标还需要另一个试验项目做支撑：CJit。

Code example:

INST_CLASS(i_type, <12.imm11_0><5.rs1><3.funct3><5.rd><7.opcode>) {
    DECODE() {
        simm32 = SIGN_EXT(imm11_0, 11);
    }
    DISASM() {
        ASM_FORMAT("[inst] [rd], [rs1], %d", simm32);
    }
}

INST(addi, <12.imm12><5.rs1>000<5.rd>0010011) {
    EXECUTE() {
        GPR[rd] = GPR[rs1] + simm32;
    }
}

Requirements

• CMake 3.10
• ruby, ruby-dev (to install racc)
• racc, install with gem install racc
• riscv toolchain, for compiling test case.

Build

update submodule: git submodule update --init --recursive

build simple simulator: mkdir build/ ; cd build/ ; cmake .. ; make

Speed Track

• v1.0, pass hello test. 5 MIPS on server, 4.5 MIPS on MacBookPro-13.3-2018
• v1.1, on Apple M1: 69 MIPS on hello-asm test, 45 MIPS on array test.

More speed details in speed.md