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emit_arm64_data_processing: Implement overflow output for Add

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Merry 2022-07-30 12:44:30 +01:00 committed by merry
parent adb18fd0a7
commit 2d0bf7ca9b
1 changed files with 14 additions and 1 deletions
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15
src/dynarmic/backend/arm64/emit_arm64_data_processing.cpp
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@ -732,13 +732,26 @@ static void MaybeAddSubImm(oaknut::CodeGenerator& code, u64 imm, EmitFn emit_fn)
template<size_t bitsize, bool sub>
static void EmitAddSub(oaknut::CodeGenerator& code, EmitContext& ctx, IR::Inst* inst) {
const auto nzcv_inst = inst->GetAssociatedPseudoOperation(IR::Opcode::GetNZCVFromOp);
const auto overflow_inst = inst->GetAssociatedPseudoOperation(IR::Opcode::GetOverflowFromOp);
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
auto Rresult = ctx.reg_alloc.WriteReg<bitsize>(inst);
auto Ra = ctx.reg_alloc.ReadReg<bitsize>(args[0]);
if (nzcv_inst) {
if (overflow_inst) {
// There is a limited set of circumstances where this is required, so assert for this.
ASSERT(!sub);
ASSERT(!nzcv_inst);
ASSERT(args[2].IsImmediate() && args[2].GetImmediateU1() == false);
auto Rb = ctx.reg_alloc.ReadReg<bitsize>(args[1]);
auto Woverflow = ctx.reg_alloc.WriteW(overflow_inst);
RegAlloc::Realize(Rresult, Ra, Rb, Woverflow);
code.ADDS(Rresult, *Ra, Rb);
code.CSET(Woverflow, VS);
} else if (nzcv_inst) {
if (args[1].IsImmediate()) {
const u64 imm = args[1].GetImmediateU64();