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a32_get_set_elimination_pass: Reduce NZC to 00C

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This commit is contained in:
Merry 2022-07-20 14:33:28 +01:00
parent 03dcc3fa50
commit b97147e187
4 changed files with 35 additions and 11 deletions
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32
src/dynarmic/backend/x64/a32_emit_x64.cpp
View file

@ -555,20 +555,32 @@ void A32EmitX64::EmitA32SetCpsrNZ(A32EmitContext& ctx, IR::Inst* inst) {
void A32EmitX64::EmitA32SetCpsrNZC(A32EmitContext& ctx, IR::Inst* inst) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
ctx.reg_alloc.Use(args[0], HostLoc::RAX);
if (args[0].IsImmediate()) {
if (args[1].IsImmediate()) {
const bool c = args[1].GetImmediateU1();
if (args[1].IsImmediate()) {
const bool c = args[1].GetImmediateU1();
code.mov(code.byte[r15 + offsetof(A32JitState, cpsr_nzcv) + 1], c);
} else {
const Xbyak::Reg8 c = ctx.reg_alloc.UseGpr(args[1]).cvt8();
code.mov(al, ah);
code.or_(al, c);
code.mov(code.byte[r15 + offsetof(A32JitState, cpsr_nzcv) + 1], al);
code.mov(code.byte[r15 + offsetof(A32JitState, cpsr_nzcv) + 1], c);
}
} else {
const Xbyak::Reg8 c = ctx.reg_alloc.UseGpr(args[1]).cvt8();
ctx.reg_alloc.Use(args[0], HostLoc::RAX);
code.mov(al, ah);
code.or_(al, c);
code.mov(code.byte[r15 + offsetof(A32JitState, cpsr_nzcv) + 1], al);
if (args[1].IsImmediate()) {
const bool c = args[1].GetImmediateU1();
code.mov(al, ah);
code.or_(al, c);
code.mov(code.byte[r15 + offsetof(A32JitState, cpsr_nzcv) + 1], al);
} else {
const Xbyak::Reg8 c = ctx.reg_alloc.UseGpr(args[1]).cvt8();
code.mov(al, ah);
code.or_(al, c);
code.mov(code.byte[r15 + offsetof(A32JitState, cpsr_nzcv) + 1], al);
}
}
}

6
src/dynarmic/ir/opt/a32_get_set_elimination_pass.cpp
View file

@ -204,8 +204,12 @@ void A32GetSetElimination(IR::Block& block) {
break;
}
case IR::Opcode::A32SetCpsrNZ: {
if (cpsr_info.nzc.set_instruction_present) {
cpsr_info.nzc.last_set_instruction->SetArg(0, IR::Value::EmptyNZCVImmediateMarker());
}
// cpsr_info.c remains valid
cpsr_info.nzc = {}; // TODO: Consider reduction of previous to a SetCFlag operation
cpsr_info.nzc = {};
cpsr_info.nzcv = {};
do_set(cpsr_info.nz, inst->GetArg(0), inst);
break;

6
src/dynarmic/ir/value.cpp
View file

@ -79,6 +79,12 @@ Value::Value(AccType value)
inner.imm_acctype = value;
}
Value Value::EmptyNZCVImmediateMarker() {
Value result{};
result.type = Type::NZCVFlags;
return result;
}
bool Value::IsIdentity() const {
if (type == Type::Opaque)
return inner.inst->GetOpcode() == Opcode::Identity;

2
src/dynarmic/ir/value.h
View file

@ -53,6 +53,8 @@ public:
explicit Value(Cond value);
explicit Value(AccType value);
static Value EmptyNZCVImmediateMarker();
bool IsIdentity() const;
bool IsEmpty() const;
bool IsImmediate() const;