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refactor: 重构值拷贝语义的指令生成逻辑

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- 移除类型无法推断时默认采用 int 方案的逻辑
- 通过构造 "src + 0" 的形式，触发 Peephole 优化折叠成 MOV
- 优化了不同类型的数据处理逻辑，提高代码可读性和可维护性
This commit is contained in:
Luke 2025-08-31 17:31:53 +08:00
parent 67d1949a25
commit c99614869f
1 changed files with 41 additions and 37 deletions
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66
src/main/java/org/jcnc/snow/compiler/ir/builder/InstructionFactory.java
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@ -104,7 +104,7 @@ public class InstructionFactory {
/**
* 生成“值拷贝”语义（src → dest）。
* 若类型无法推断，默认采用 int 方案（ADD_I32, src+0）。
* 通过在 IR 中构造 “src + 0” 的形式，触发 Peephole 优化折叠成 MOV。
*
* @param ctx 当前 IR 上下文
* @param src 源寄存器
@ -114,46 +114,50 @@ public class InstructionFactory {
if (src == dest) {
return;
}
String varType = ctx.getVarType(); // 需要 IRContext 提供
char suffix = '\0';
String varType = ctx.getVarType();
IROpCode op;
IRConstant zeroConst;
if (varType != null) {
switch (varType) {
case "byte" -> suffix = 'b';
case "short" -> suffix = 's';
case "int" -> suffix = 'i';
case "long" -> suffix = 'l';
case "float" -> suffix = 'f';
case "double" -> suffix = 'd';
case "byte" -> {
op = IROpCode.ADD_B8;
zeroConst = new IRConstant((byte) 0);
}
case "short" -> {
op = IROpCode.ADD_S16;
zeroConst = new IRConstant((short) 0);
}
IRVirtualRegister zero;
IROpCode op = switch (suffix) {
case 'd' -> {
zero = loadConst(ctx, 0.0);
yield IROpCode.ADD_D64;
case "int" -> {
op = IROpCode.ADD_I32;
zeroConst = new IRConstant(0);
}
case 'f' -> {
zero = loadConst(ctx, 0.0f);
yield IROpCode.ADD_F32;
case "long" -> {
op = IROpCode.ADD_L64;
zeroConst = new IRConstant(0L);
}
case 'l' -> {
zero = loadConst(ctx, 0L);
yield IROpCode.ADD_L64;
case "float" -> {
op = IROpCode.ADD_F32;
zeroConst = new IRConstant(0.0f);
}
case 's' -> {
zero = loadConst(ctx, 0);
yield IROpCode.ADD_S16;
}
case 'b' -> {
zero = loadConst(ctx, 0);
yield IROpCode.ADD_B8;
case "double" -> {
op = IROpCode.ADD_D64;
zeroConst = new IRConstant(0.0);
}
default -> {
zero = loadConst(ctx, 0);
yield IROpCode.ADD_I32;
// 引用类型 / 结构体等统一走 int 路径
op = IROpCode.ADD_I32;
zeroConst = new IRConstant(0);
}
};
ctx.addInstruction(new BinaryOperationInstruction(op, dest, src, zero));
}
} else {
// 无法推断类型时，退化为 int 方案
op = IROpCode.ADD_I32;
zeroConst = new IRConstant(0);
}
// 注意：这里传入的是立即数 zeroConst，而不是寄存器
ctx.addInstruction(new BinaryOperationInstruction(op, dest, src, zeroConst));
}
/**