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[midend-IVE]参考libdivide库，实现了魔数的正确求解，如果后续出错直接用API或者不要除法强度削弱了

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rain2133
2025-08-14 05:12:54 +08:00
parent 06a368db39
commit 7547d34598
5 changed files with 421 additions and 61 deletions
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24
src/midend/IR.cpp
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@@ -779,7 +779,29 @@ void BinaryInst::print(std::ostream &os) const {
printOperand(os, getRhs());
os << "\n ";
printVarName(os, this) << " = zext i1 %" << tmpName << " to i32";
} else {
} else if(kind == kMulh){
// 模拟高位乘法：先扩展为i64，乘法，右移32位，截断为i32
static int mulhCount = 0;
mulhCount++;
std::string lhsName = getLhs()->getName();
std::string rhsName = getRhs()->getName();
std::string tmpLhs = "tmp_mulh_lhs_" + std::to_string(mulhCount) + "_" + lhsName;
std::string tmpRhs = "tmp_mulh_rhs_" + std::to_string(mulhCount) + rhsName;
std::string tmpMul = "tmp_mulh_mul_" + std::to_string(mulhCount) + getName();
std::string tmpHigh = "tmp_mulh_high_" + std::to_string(mulhCount) + getName();
// printVarName(os, this) << " = "; // 输出最终变量名
// os << "; mulh emulation\n ";
os << "%" << tmpLhs << " = sext i32 ";
printOperand(os, getLhs());
os << " to i64\n ";
os << "%" << tmpRhs << " = sext i32 ";
printOperand(os, getRhs());
os << " to i64\n ";
os << "%" << tmpMul << " = mul i64 %" << tmpLhs << ", %" << tmpRhs << "\n ";
os << "%" << tmpHigh << " = ashr i64 %" << tmpMul << ", 32\n ";
printVarName(os, this) << " = trunc i64 %" << tmpHigh << " to i32";
}else {
// 算术和逻辑指令
printVarName(os, this) << " = ";
os << getKindString() << " " << *getType() << " ";