380 lines
7.1 KiB
C++
380 lines
7.1 KiB
C++
/*
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toy vm
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register A, B : 32bit
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PC : program counter
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mem_ 4byte x 65536
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all instructions are fixed at 4 bytes.
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all immediate values are 16-bit.
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R = A or B
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vldiR, imm ; R = imm
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vldR, idx ; R = mem_[idx]
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vstR, idx ; mem_[idx] = R
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vaddiR, imm ; R += imm
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vsubiR, imm ; R -= imm
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vaddR, idx ; R += mem_[idx]
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vsubR, idx ; R -= mem_[idx]
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vputR ; print R
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vjnzR, offset; if (R != 0) then jmp(PC += offset(signed))
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*/
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#if defined(_MSC_VER) && (_MSC_VER <= 1200)
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#pragma warning(disable:4514)
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#pragma warning(disable:4786)
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <memory.h>
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#include <vector>
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#define XBYAK_NO_OP_NAMES
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#include "xbyak/xbyak.h"
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#include "xbyak/xbyak_util.h"
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#define NUM_OF_ARRAY(x) (sizeof(x) / sizeof(x[0]))
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#ifdef XBYAK64
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#error "only 32bit"
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#endif
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using namespace Xbyak;
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class ToyVm : public Xbyak::CodeGenerator {
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typedef std::vector<uint32_t> Buffer;
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public:
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enum Reg {
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A, B
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};
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enum Code {
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LD, LDI, ST, ADD, ADDI, SUB, SUBI, PUT, JNZ,
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END_OF_CODE
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};
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ToyVm()
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: mark_(0)
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{
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::memset(mem_, 0, sizeof(mem_));
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}
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void vldi(Reg r, uint16_t imm) { encode(LDI, r, imm); }
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void vld(Reg r, uint16_t idx) { encode(LD, r, idx); }
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void vst(Reg r, uint16_t idx) { encode(ST, r, idx); }
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void vadd(Reg r, uint16_t idx) { encode(ADD, r, idx); }
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void vaddi(Reg r, uint16_t imm) { encode(ADDI, r, imm); }
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void vsub(Reg r, uint16_t idx) { encode(SUB, r, idx); }
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void vsubi(Reg r, uint16_t imm) { encode(SUBI, r, imm); }
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void vjnz(Reg r, int offset) { encode(JNZ, r, static_cast<uint16_t>(offset)); }
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void vput(Reg r) { encode(PUT, r); }
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void setMark()
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{
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mark_ = (int)code_.size();
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}
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int getMarkOffset()
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{
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return mark_ - (int)code_.size() - 1;
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}
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void run()
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{
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bool debug = false;//true;
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uint32_t reg[2] = { 0, 0 };
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const size_t end = code_.size();
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uint32_t pc = 0;
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for (;;) {
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uint32_t x = code_[pc];
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uint32_t code, r, imm;
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decode(code, r, imm, x);
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if (debug) {
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printf("---\n");
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printf("A %08x B %08x\n", reg[0], reg[1]);
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printf("mem_[] = %08x %08x %08x\n", mem_[0], mem_[1], mem_[2]);
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printf("pc=%4d, code=%02x, r=%d, imm=%04x\n", pc, code, r, imm);
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}
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switch (code) {
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case LDI:
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reg[r] = imm;
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break;
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case LD:
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reg[r] = mem_[imm];
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break;
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case ST:
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mem_[imm] = reg[r];
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break;
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case ADD:
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reg[r] += mem_[imm];
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break;
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case ADDI:
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reg[r] += imm;
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break;
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case SUB:
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reg[r] -= mem_[imm];
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break;
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case SUBI:
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reg[r] -= imm;
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break;
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case PUT:
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printf("%c %8u(0x%08x)\n", 'A' + r, reg[r], reg[r]);
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break;
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case JNZ:
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if (reg[r] != 0) pc += static_cast<signed short>(imm);
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break;
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default:
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assert(0);
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break;
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}
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pc++;
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if (pc >= end) break;
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} // for (;;)
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}
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void recompile()
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{
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using namespace Xbyak;
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/*
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esi : A
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edi : B
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ebx : mem_
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for speed up
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mem_[0] : eax
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mem_[1] : ecx
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mem_[2] : edx
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*/
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push(ebx);
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push(esi);
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push(edi);
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const Reg32 reg[2] = { esi, edi };
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const Reg32 mem(ebx);
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const Reg32 memTbl[] = { eax, ecx, edx };
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const size_t memTblNum = NUM_OF_ARRAY(memTbl);
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for (size_t i = 0; i < memTblNum; i++) xor_(memTbl[i], memTbl[i]);
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xor_(esi, esi);
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xor_(edi, edi);
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mov(mem, (size_t)mem_);
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const size_t end = code_.size();
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uint32_t pc = 0;
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uint32_t labelNum = 0;
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for (;;) {
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uint32_t x = code_[pc];
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uint32_t code, r, imm;
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decode(code, r, imm, x);
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L(Label::toStr(labelNum++));
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switch (code) {
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case LDI:
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mov(reg[r], imm);
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break;
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case LD:
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if (imm < memTblNum) {
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mov(reg[r], memTbl[imm]);
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} else {
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mov(reg[r], ptr[mem + imm * 4]);
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}
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break;
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case ST:
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if (imm < memTblNum) {
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mov(memTbl[imm], reg[r]);
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} else {
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mov(ptr [mem + imm * 4], reg[r]);
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}
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break;
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case ADD:
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if (imm < memTblNum) {
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add(reg[r], memTbl[imm]);
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} else {
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add(reg[r], ptr [mem + imm * 4]);
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}
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break;
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case ADDI:
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add(reg[r], imm);
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break;
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case SUB:
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if (imm < memTblNum) {
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sub(reg[r], memTbl[imm]);
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} else {
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sub(reg[r], ptr [mem + imm * 4]);
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}
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break;
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case SUBI:
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sub(reg[r], imm);
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break;
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case PUT:
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{
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static const char *str = "%c %8d(0x%08x)\n";
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push(eax);
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push(edx);
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push(ecx);
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push(reg[r]);
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push(reg[r]);
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push('A' + r);
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push((int)str);
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call(reinterpret_cast<const void*>(printf));
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add(esp, 4 * 4);
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pop(ecx);
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pop(edx);
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pop(eax);
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}
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break;
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case JNZ:
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test(reg[r], reg[r]);
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jnz(Label::toStr(labelNum + static_cast<signed short>(imm)));
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break;
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default:
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assert(0);
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break;
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}
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pc++;
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if (pc >= end) break;
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} // for (;;)
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pop(edi);
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pop(esi);
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pop(ebx);
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ret();
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}
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private:
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uint32_t mem_[65536];
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Buffer code_;
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int mark_;
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void decode(uint32_t& code, uint32_t& r, uint32_t& imm, uint32_t x)
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{
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code = x >> 24;
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r = (x >> 16) & 0xff;
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imm = x & 0xffff;
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}
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void encode(Code code, Reg r, uint16_t imm = 0)
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{
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uint32_t x = (code << 24) | (r << 16) | imm;
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code_.push_back(x);
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}
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};
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class Fib : public ToyVm {
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public:
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Fib(int n)
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{
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if (n >= 65536) {
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fprintf(stderr, "current version support only imm16\n");
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return;
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}
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/*
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A : c
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B : temporary
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mem_[0] : p
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mem_[1] : t
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mem_[2] : n
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*/
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vldi(A, 1); // c
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vst(A, 0); // p(1)
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vldi(B, static_cast<uint16_t>(n));
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vst(B, 2); // n
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// lp
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setMark();
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vst(A, 1); // t = c
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vadd(A, 0); // c += p
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vld(B, 1);
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vst(B, 0); // p = t
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// vput(A);
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vld(B, 2);
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vsubi(B, 1);
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vst(B, 2); // n--
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vjnz(B, getMarkOffset());
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vput(A);
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}
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void runByJIT()
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{
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getCode<void (*)()>();
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}
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};
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void fibC(uint32_t n)
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{
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uint32_t p, c, t;
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p = 1;
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c = 1;
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lp:
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t = c;
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c += p;
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p = t;
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n--;
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if (n != 0) goto lp;
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printf("c=%u(0x%08x)\n", c, c);
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}
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int main()
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{
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try {
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const int n = 10000;
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Fib fib(n);
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fib.recompile();
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{
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Xbyak::util::Clock clk;
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clk.begin();
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fib.run();
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clk.end();
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printf("vm %.2fKclk\n", clk.getClock() * 1e-3);
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}
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{
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Xbyak::util::Clock clk;
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clk.begin();
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fib.runByJIT();
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clk.end();
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printf("jit %.2fKclk\n", clk.getClock() * 1e-3);
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}
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{
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Xbyak::util::Clock clk;
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clk.begin();
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fibC(n);
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clk.end();
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printf("native C %.2fKclk\n", clk.getClock() * 1e-3);
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}
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} catch (std::exception& e) {
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printf("ERR:%s\n", e.what());
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} catch (...) {
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printf("unknown error\n");
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}
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return 0;
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}
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/*
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the code generated by Xbyak
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push ebx
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push esi
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push edi
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xor eax,eax
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xor ecx,ecx
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xor edx,edx
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xor esi,esi
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xor edi,edi
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mov ebx,0EFF58h
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mov esi,1
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mov eax,esi
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mov edi,2710h
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mov edx,edi
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.lp:
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mov ecx,esi
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add esi,eax
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mov edi,ecx
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mov eax,edi
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mov edi,edx
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sub edi,1
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mov edx,edi
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test edi,edi
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jne .lp
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push eax
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push edx
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push ecx
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push esi
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push esi
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push 41h
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push 42C434h
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call printf (409342h)
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add esp,10h
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pop ecx
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pop edx
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pop eax
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pop edi
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pop esi
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pop ebx
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ret
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*/
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