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[backend]开始区分调用者保存寄存器与被调用者保存寄存器

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This commit is contained in:
Lixuanwang
2025-07-26 12:39:17 +08:00
parent 5bfa6d72a2
commit e57ac7709d
2 changed files with 9 additions and 2 deletions
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8
src/RISCv64RegAlloc.cpp
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@ -436,8 +436,12 @@ void RISCv64RegAlloc::rewriteFunction() {
if (reg_op->isVirtual()) { if (reg_op->isVirtual()) {
unsigned vreg = reg_op->getVRegNum(); unsigned vreg = reg_op->getVRegNum();
if (color_map.count(vreg)) { if (color_map.count(vreg)) {
// 如果vreg被成功着色，替换为物理寄存器 PhysicalReg preg = color_map.at(vreg);
reg_op->setPReg(color_map.at(vreg)); reg_op->setPReg(preg);
// 检查这个物理寄存器是否是 s0-s11
if (preg >= PhysicalReg::S0 && preg <= PhysicalReg::S11) {
used_callee_saved_regs.insert(preg);
}
} else if (spilled_vregs.count(vreg)) { } else if (spilled_vregs.count(vreg)) {
// 如果vreg被溢出，替换为专用的溢出物理寄存器t6 // 如果vreg被溢出，替换为专用的溢出物理寄存器t6
reg_op->setPReg(PhysicalReg::T6); reg_op->setPReg(PhysicalReg::T6);

3
src/include/RISCv64RegAlloc.h
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@ -54,8 +54,11 @@ private:
// 这个map将在run()函数开始时被填充，并在rewriteFunction()中使用。 // 这个map将在run()函数开始时被填充，并在rewriteFunction()中使用。
std::map<unsigned, Value*> vreg_to_value_map; std::map<unsigned, Value*> vreg_to_value_map;
std::set<PhysicalReg> used_callee_saved_regs;
// 用于计算类型大小的辅助函数 // 用于计算类型大小的辅助函数
unsigned getTypeSizeInBytes(Type* type); unsigned getTypeSizeInBytes(Type* type);
}; };
} // namespace sysy } // namespace sysy