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ir: Implement GetGEFlags, SetGEFlags

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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
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@@ -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);