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ir: Implement GetGEFlags, SetGEFlags

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This commit is contained in:
MerryMage 2016-11-23 19:44:27 +00:00
parent e7d02a5439
commit b6f7b8babd
6 changed files with 48 additions and 0 deletions
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25
src/backend_x64/emit_x64.cpp
View file

@ -278,6 +278,31 @@ void EmitX64::EmitOrQFlag(IR::Block&, IR::Inst* inst) {
}
}
void EmitX64::EmitGetGEFlags(IR::Block&, IR::Inst* inst) {
Xbyak::Reg32 result = reg_alloc.DefGpr(inst).cvt32();
code->mov(result, MJitStateCpsr());
code->shr(result, 16);
code->and_(result, 0xF);
}
void EmitX64::EmitSetGEFlags(IR::Block&, IR::Inst* inst) {
constexpr size_t flag_bit = 16;
constexpr u32 flag_mask = 0xFu << flag_bit;
IR::Value arg = inst->GetArg(0);
if (arg.IsImmediate()) {
u32 imm = (arg.GetU32() << flag_bit) & flag_mask;
code->and_(MJitStateCpsr(), ~flag_mask);
code->or_(MJitStateCpsr(), imm);
} else {
Xbyak::Reg32 to_store = reg_alloc.UseScratchGpr(arg).cvt32();
code->shl(to_store, flag_bit);
code->and_(to_store, flag_mask);
code->and_(MJitStateCpsr(), ~flag_mask);
code->or_(MJitStateCpsr(), to_store);
}
}
void EmitX64::EmitBXWritePC(IR::Block&, IR::Inst* inst) {
const u32 T_bit = 1 << 5;
auto arg = inst->GetArg(0);

8
src/frontend/ir/ir_emitter.cpp
View file

@ -137,6 +137,14 @@ void IREmitter::OrQFlag(const Value& value) {
Inst(Opcode::OrQFlag, {value});
}
Value IREmitter::GetGEFlags() {
return Inst(Opcode::GetGEFlags, {});
}
void IREmitter::SetGEFlags(const Value& value) {
Inst(Opcode::SetGEFlags, {value});
}
Value IREmitter::GetFpscr() {
return Inst(Opcode::GetFpscr, {});
}

2
src/frontend/ir/ir_emitter.h
View file

@ -77,6 +77,8 @@ public:
void SetCFlag(const Value& value);
void SetVFlag(const Value& value);
void OrQFlag(const Value& value);
Value GetGEFlags();
void SetGEFlags(const Value& value);
Value GetFpscr();
void SetFpscr(const Value& new_fpscr);

2
src/frontend/ir/microinstruction.cpp
View file

@ -99,6 +99,7 @@ bool Inst::ReadsFromCPSR() const {
case Opcode::GetZFlag:
case Opcode::GetCFlag:
case Opcode::GetVFlag:
case Opcode::GetGEFlags:
return true;
default:
@ -114,6 +115,7 @@ bool Inst::WritesToCPSR() const {
case Opcode::SetCFlag:
case Opcode::SetVFlag:
case Opcode::OrQFlag:
case Opcode::SetGEFlags:
return true;
default:

2
src/frontend/ir/opcodes.inc
View file

@ -21,6 +21,8 @@ OPCODE(SetCFlag, T::Void, T::U1
OPCODE(GetVFlag, T::U1, )
OPCODE(SetVFlag, T::Void, T::U1 )
OPCODE(OrQFlag, T::Void, T::U1 )
OPCODE(GetGEFlags, T::U32, )
OPCODE(SetGEFlags, T::Void, T::U32 )
OPCODE(BXWritePC, T::Void, T::U32 )
OPCODE(CallSupervisor, T::Void, T::U32 )
OPCODE(GetFpscr, T::U32, )

9
src/ir_opt/get_set_elimination_pass.cpp
View file

@ -30,6 +30,7 @@ void GetSetElimination(IR::Block& block) {
RegisterInfo z;
RegisterInfo c;
RegisterInfo v;
RegisterInfo ge;
} cpsr_info;
const auto do_set = [&block](RegisterInfo& info, IR::Value value, Iterator set_inst) {
@ -146,6 +147,14 @@ void GetSetElimination(IR::Block& block) {
do_get(cpsr_info.v, inst);
break;
}
case IR::Opcode::SetGEFlags: {
do_set(cpsr_info.ge, inst->GetArg(0), inst);
break;
}
case IR::Opcode::GetGEFlags: {
do_get(cpsr_info.ge, inst);
break;
}
default: {
if (inst->ReadsFromCPSR() || inst->WritesToCPSR()) {
cpsr_info = {};