85 lines
2.3 KiB
C++
85 lines
2.3 KiB
C++
// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
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#pragma once
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#include "Luau/IrData.h"
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#include "Luau/RegisterA64.h"
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#include <initializer_list>
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#include <utility>
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#include <vector>
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namespace Luau
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{
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namespace CodeGen
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{
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namespace A64
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{
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class AssemblyBuilderA64;
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struct IrRegAllocA64
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{
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IrRegAllocA64(IrFunction& function, std::initializer_list<std::pair<RegisterA64, RegisterA64>> regs);
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RegisterA64 allocReg(KindA64 kind, uint32_t index);
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RegisterA64 allocTemp(KindA64 kind);
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RegisterA64 allocReuse(KindA64 kind, uint32_t index, std::initializer_list<IrOp> oprefs);
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RegisterA64 takeReg(RegisterA64 reg, uint32_t index);
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void freeReg(RegisterA64 reg);
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void freeLastUseReg(IrInst& target, uint32_t index);
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void freeLastUseRegs(const IrInst& inst, uint32_t index);
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void freeTempRegs();
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// Spills all live registers that outlive current instruction; all allocated registers are assumed to be undefined
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size_t spill(AssemblyBuilderA64& build, uint32_t index, std::initializer_list<RegisterA64> live = {});
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// Restores registers starting from the offset returned by spill(); all spills will be restored to the original registers
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void restore(AssemblyBuilderA64& build, size_t start);
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// Restores register for a single instruction; may not assign the previously used register!
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void restoreReg(AssemblyBuilderA64& build, IrInst& inst);
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void assertNoSpills() const;
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struct Set
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{
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// which registers are in the set that the allocator manages (initialized at construction)
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uint32_t base = 0;
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// which subset of initial set is free
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uint32_t free = 0;
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// which subset of initial set is allocated as temporary
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uint32_t temp = 0;
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// which instruction is defining which register (for spilling); only valid if not free and not temp
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uint32_t defs[32];
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};
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struct Spill
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{
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uint32_t inst;
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RegisterA64 origin;
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int8_t slot;
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};
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Set& getSet(KindA64 kind);
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IrFunction& function;
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Set gpr, simd;
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std::vector<Spill> spills;
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// which 8-byte slots are free
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uint32_t freeSpillSlots = 0;
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};
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} // namespace A64
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} // namespace CodeGen
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} // namespace Luau
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