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backend/arm64/reg_alloc: Generate immediates when required

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Merry 2022-07-24 18:53:20 +01:00 committed by merry
parent bdb41be0c5
commit 02cfbb8b0b
2 changed files with 67 additions and 21 deletions
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52
src/dynarmic/backend/arm64/reg_alloc.cpp
View file

@ -90,6 +90,12 @@ bool HostLocInfo::Contains(const IR::Inst* value) const {
return std::find(values.begin(), values.end(), value) != values.end();
}
void HostLocInfo::SetupScratchLocation() {
ASSERT(values.empty());
locked = true;
realized = true;
}
void HostLocInfo::SetupLocation(const IR::Inst* value) {
values.clear();
values.emplace_back(value);
@ -192,9 +198,45 @@ void RegAlloc::AssertNoMoreUses() const {
ASSERT(std::all_of(spills.begin(), spills.end(), is_empty));
}
template<HostLoc::Kind kind>
int RegAlloc::GenerateImmediate(const IR::Value& value) {
if constexpr (kind == HostLoc::Kind::Gpr) {
const int new_location_index = AllocateRegister(gprs, gpr_order);
SpillGpr(new_location_index);
gprs[new_location_index].SetupScratchLocation();
code.MOV(oaknut::XReg{new_location_index}, value.GetImmediateAsU64());
return new_location_index;
} else if constexpr (kind == HostLoc::Kind::Fpr) {
const int new_location_index = AllocateRegister(fprs, fpr_order);
SpillFpr(new_location_index);
fprs[new_location_index].SetupScratchLocation();
code.MOV(Xscratch0, value.GetImmediateAsU64());
code.FMOV(oaknut::DReg{new_location_index}, Xscratch0);
return new_location_index;
} else if constexpr (kind == HostLoc::Kind::Flags) {
SpillFlags();
flags.SetupScratchLocation();
code.MOV(Xscratch0, value.GetImmediateAsU64());
code.MSR(oaknut::SystemReg::NZCV, Xscratch0);
return 0;
} else {
static_assert(kind == HostLoc::Kind::Fpr || kind == HostLoc::Kind::Gpr || kind == HostLoc::Kind::Flags);
}
}
template<HostLoc::Kind required_kind>
int RegAlloc::RealizeReadImpl(const IR::Inst* value) {
const auto current_location = ValueLocation(value);
int RegAlloc::RealizeReadImpl(const IR::Value& value) {
if (value.IsImmediate()) {
return GenerateImmediate<required_kind>(value);
}
const auto current_location = ValueLocation(value.GetInst());
ASSERT(current_location);
if (current_location->kind == required_kind) {
@ -280,9 +322,9 @@ int RegAlloc::RealizeWriteImpl(const IR::Inst* value) {
}
}
template int RegAlloc::RealizeReadImpl<HostLoc::Kind::Gpr>(const IR::Inst* value);
template int RegAlloc::RealizeReadImpl<HostLoc::Kind::Fpr>(const IR::Inst* value);
template int RegAlloc::RealizeReadImpl<HostLoc::Kind::Flags>(const IR::Inst* value);
template int RegAlloc::RealizeReadImpl<HostLoc::Kind::Gpr>(const IR::Value& value);
template int RegAlloc::RealizeReadImpl<HostLoc::Kind::Fpr>(const IR::Value& value);
template int RegAlloc::RealizeReadImpl<HostLoc::Kind::Flags>(const IR::Value& value);
template int RegAlloc::RealizeWriteImpl<HostLoc::Kind::Gpr>(const IR::Inst* value);
template int RegAlloc::RealizeWriteImpl<HostLoc::Kind::Fpr>(const IR::Inst* value);
template int RegAlloc::RealizeWriteImpl<HostLoc::Kind::Flags>(const IR::Inst* value);

36
src/dynarmic/backend/arm64/reg_alloc.h
View file

@ -102,7 +102,7 @@ public:
private:
friend class RegAlloc;
explicit RAReg(RegAlloc& reg_alloc, bool write, const IR::Inst* value)
explicit RAReg(RegAlloc& reg_alloc, bool write, const IR::Value& value)
: reg_alloc{reg_alloc}, write{write}, value{value} {}
RAReg(const RAReg&) = delete;
@ -114,7 +114,7 @@ private:
RegAlloc& reg_alloc;
bool write;
const IR::Inst* value;
const IR::Value value;
std::optional<T> reg;
};
@ -127,6 +127,7 @@ struct HostLocInfo {
size_t expected_uses = 0;
bool Contains(const IR::Inst*) const;
void SetupScratchLocation();
void SetupLocation(const IR::Inst*);
bool IsCompletelyEmpty() const;
bool IsImmediatelyAllocatable() const;
@ -183,16 +184,16 @@ public:
}
}
auto WriteX(IR::Inst* inst) { return RAReg<oaknut::XReg>{*this, true, inst}; }
auto WriteW(IR::Inst* inst) { return RAReg<oaknut::WReg>{*this, true, inst}; }
auto WriteX(IR::Inst* inst) { return RAReg<oaknut::XReg>{*this, true, IR::Value{inst}}; }
auto WriteW(IR::Inst* inst) { return RAReg<oaknut::WReg>{*this, true, IR::Value{inst}}; }
auto WriteQ(IR::Inst* inst) { return RAReg<oaknut::QReg>{*this, true, inst}; }
auto WriteD(IR::Inst* inst) { return RAReg<oaknut::DReg>{*this, true, inst}; }
auto WriteS(IR::Inst* inst) { return RAReg<oaknut::SReg>{*this, true, inst}; }
auto WriteH(IR::Inst* inst) { return RAReg<oaknut::HReg>{*this, true, inst}; }
auto WriteB(IR::Inst* inst) { return RAReg<oaknut::BReg>{*this, true, inst}; }
auto WriteQ(IR::Inst* inst) { return RAReg<oaknut::QReg>{*this, true, IR::Value{inst}}; }
auto WriteD(IR::Inst* inst) { return RAReg<oaknut::DReg>{*this, true, IR::Value{inst}}; }
auto WriteS(IR::Inst* inst) { return RAReg<oaknut::SReg>{*this, true, IR::Value{inst}}; }
auto WriteH(IR::Inst* inst) { return RAReg<oaknut::HReg>{*this, true, IR::Value{inst}}; }
auto WriteB(IR::Inst* inst) { return RAReg<oaknut::BReg>{*this, true, IR::Value{inst}}; }
auto WriteFlags(IR::Inst* inst) { return RAReg<FlagsTag>{*this, true, inst}; }
auto WriteFlags(IR::Inst* inst) { return RAReg<FlagsTag>{*this, true, IR::Value{inst}}; }
template<size_t size>
auto WriteReg(IR::Inst* inst) {
@ -248,14 +249,17 @@ private:
template<typename>
friend struct RAReg;
const IR::Inst* PreReadImpl(const IR::Value& value) {
const IR::Inst* inst = value.GetInst();
ValueInfo(inst).locked = true;
return inst;
const IR::Value& PreReadImpl(const IR::Value& value) {
if (!value.IsImmediate()) {
ValueInfo(value.GetInst()).locked = true;
}
return value;
}
template<HostLoc::Kind kind>
int RealizeReadImpl(const IR::Inst* value);
int GenerateImmediate(const IR::Value& value);
template<HostLoc::Kind kind>
int RealizeReadImpl(const IR::Value& value);
template<HostLoc::Kind kind>
int RealizeWriteImpl(const IR::Inst* value);
void Unlock(HostLoc host_loc);
@ -292,7 +296,7 @@ RAReg<T>::~RAReg() {
template<typename T>
void RAReg<T>::Realize() {
reg = T{write ? reg_alloc.RealizeWriteImpl<kind>(value) : reg_alloc.RealizeReadImpl<kind>(value)};
reg = T{write ? reg_alloc.RealizeWriteImpl<kind>(value.GetInst()) : reg_alloc.RealizeReadImpl<kind>(value)};
}
} // namespace Dynarmic::Backend::Arm64