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[optimze]添加基础的除法指令优化，目前只对除以2的幂数生效

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CGH0S7
2025-08-03 13:46:42 +08:00
parent e8699d6d25
commit f312792fe9
10 changed files with 419 additions and 6 deletions
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21
src/midend/SysYIRGenerator.cpp
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@@ -249,7 +249,26 @@ void SysYIRGenerator::compute() {
case BinaryOp::ADD: resultValue = builder.createAddInst(lhs, rhs); break;
case BinaryOp::SUB: resultValue = builder.createSubInst(lhs, rhs); break;
case BinaryOp::MUL: resultValue = builder.createMulInst(lhs, rhs); break;
case BinaryOp::DIV: resultValue = builder.createDivInst(lhs, rhs); break;
case BinaryOp::DIV: {
ConstantInteger *rhsConst = dynamic_cast<ConstantInteger *>(rhs);
if (rhsConst) {
int divisor = rhsConst->getInt();
if (divisor > 0 && (divisor & (divisor - 1)) == 0) {
int shift = 0;
int temp = divisor;
while (temp > 1) {
temp >>= 1;
shift++;
}
resultValue = builder.createSRAInst(lhs, ConstantInteger::get(shift));
} else {
resultValue = builder.createDivInst(lhs, rhs);
}
} else {
resultValue = builder.createDivInst(lhs, rhs);
}
break;
}
case BinaryOp::MOD: resultValue = builder.createRemInst(lhs, rhs); break;
}
} else if (commonType == Type::getFloatType()) {