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JitArm64: Improve Arm64FPRCache::GetCallerSavedUsed

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If we're only using the lower 64 bits of a callee-saved
register, GetCallerSavedUsed can return false for it.
This commit is contained in:
JosJuice 2021-05-29 11:44:04 +02:00
parent 674e2aa573
commit fdcea8566d
2 changed files with 13 additions and 1 deletions
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13
Source/Core/Core/PowerPC/JitArm64/JitArm64_RegCache.cpp
View File

@ -742,6 +742,17 @@ bool Arm64FPRCache::IsCalleeSaved(ARM64Reg reg) const
return std::find(callee_regs.begin(), callee_regs.end(), reg) != callee_regs.end();
}
bool Arm64FPRCache::IsTopHalfUsed(ARM64Reg reg) const
{
for (const OpArg& r : m_guest_registers)
{
if (r.GetReg() != ARM64Reg::INVALID_REG && DecodeReg(r.GetReg()) == DecodeReg(reg))
return r.GetType() == RegType::Register;
}
return false;
}
void Arm64FPRCache::FlushRegister(size_t preg, bool maintain_state, ARM64Reg tmp_reg)
{
OpArg& reg = m_guest_registers[preg];
@ -846,7 +857,7 @@ BitSet32 Arm64FPRCache::GetCallerSavedUsed() const
BitSet32 registers(0);
for (const auto& it : m_host_registers)
{
if (it.IsLocked())
if (it.IsLocked() && (!IsCalleeSaved(it.GetReg()) || IsTopHalfUsed(it.GetReg())))
registers[DecodeReg(it.GetReg())] = true;
}
return registers;

1
Source/Core/Core/PowerPC/JitArm64/JitArm64_RegCache.h
View File

@ -351,6 +351,7 @@ protected:
private:
bool IsCalleeSaved(Arm64Gen::ARM64Reg reg) const;
bool IsTopHalfUsed(Arm64Gen::ARM64Reg reg) const;
void FlushRegisters(BitSet32 regs, bool maintain_state, Arm64Gen::ARM64Reg tmp_reg);
};