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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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12
src/dynarmic/backend/x64/a32_emit_x64.cpp
View file

@ -555,6 +555,17 @@ void A32EmitX64::EmitA32SetCpsrNZ(A32EmitContext& ctx, IR::Inst* inst) {
void A32EmitX64::EmitA32SetCpsrNZC(A32EmitContext& ctx, IR::Inst* inst) { void A32EmitX64::EmitA32SetCpsrNZC(A32EmitContext& ctx, IR::Inst* inst) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst); auto args = ctx.reg_alloc.GetArgumentInfo(inst);
if (args[0].IsImmediate()) {
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(code.byte[r15 + offsetof(A32JitState, cpsr_nzcv) + 1], c);
}
} else {
ctx.reg_alloc.Use(args[0], HostLoc::RAX); ctx.reg_alloc.Use(args[0], HostLoc::RAX);
if (args[1].IsImmediate()) { if (args[1].IsImmediate()) {
@ -571,6 +582,7 @@ void A32EmitX64::EmitA32SetCpsrNZC(A32EmitContext& ctx, IR::Inst* inst) {
code.mov(code.byte[r15 + offsetof(A32JitState, cpsr_nzcv) + 1], al); code.mov(code.byte[r15 + offsetof(A32JitState, cpsr_nzcv) + 1], al);
} }
} }
}
static void EmitGetFlag(BlockOfCode& code, A32EmitContext& ctx, IR::Inst* inst, size_t flag_bit) { static void EmitGetFlag(BlockOfCode& code, A32EmitContext& ctx, IR::Inst* inst, size_t flag_bit) {
const Xbyak::Reg32 result = ctx.reg_alloc.ScratchGpr().cvt32(); const Xbyak::Reg32 result = ctx.reg_alloc.ScratchGpr().cvt32();

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

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

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

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