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backend/rv64: Implement basic Sub32

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This commit is contained in:
Yang Liu 2024-02-17 17:49:09 +08:00 committed by Merry
parent b485553ed8
commit f6e02048f5
1 changed files with 83 additions and 0 deletions
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83
src/dynarmic/backend/riscv64/emit_riscv64_data_processing.cpp
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@ -54,4 +54,87 @@ void EmitIR<IR::Opcode::LogicalShiftLeft32>(biscuit::Assembler& as, EmitContext&
}
}
template<size_t bitsize>
static void AddImmWithFlags(biscuit::Assembler& as, biscuit::GPR rd, biscuit::GPR rs, u64 imm, biscuit::GPR flags) {
static_assert(bitsize == 32 || bitsize == 64);
if constexpr (bitsize == 32) {
imm = static_cast<u32>(imm);
}
if (mcl::bit::sign_extend<12>(imm) == imm) {
as.ADDIW(rd, rs, imm);
} else {
as.LI(Xscratch0, imm);
as.ADDW(rd, rs, Xscratch0);
}
// N
as.SEQZ(flags, rd);
as.SLLI(flags, flags, 30);
// Z
as.SLTZ(Xscratch1, rd);
as.SLLI(Xscratch1, Xscratch1, 31);
as.OR(flags, flags, Xscratch1);
// C
if (mcl::bit::sign_extend<12>(imm) == imm) {
as.ADDI(Xscratch1, rs, imm);
} else {
as.ADD(Xscratch1, rs, Xscratch0);
}
as.SRLI(Xscratch1, Xscratch1, 3);
as.LUI(Xscratch0, 0x20000);
as.AND(Xscratch1, Xscratch1, Xscratch0);
as.OR(flags, flags, Xscratch1);
// V
as.LI(Xscratch0, imm);
as.ADD(Xscratch1, rs, Xscratch0);
as.XOR(Xscratch0, Xscratch0, rs);
as.NOT(Xscratch0, Xscratch0);
as.XOR(Xscratch1, Xscratch1, rs);
as.AND(Xscratch1, Xscratch0, Xscratch1);
as.SRLIW(Xscratch1, Xscratch1, 31);
as.SLLI(Xscratch1, Xscratch1, 28);
as.OR(flags, flags, Xscratch1);
}
template<size_t bitsize>
static void EmitSub(biscuit::Assembler& as, EmitContext& ctx, IR::Inst* inst) {
const auto nzcv_inst = inst->GetAssociatedPseudoOperation(IR::Opcode::GetNZCVFromOp);
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
auto Xresult = ctx.reg_alloc.WriteX(inst);
auto Xa = ctx.reg_alloc.ReadX(args[0]);
if (nzcv_inst) {
if (args[1].IsImmediate()) {
const u64 imm = args[1].GetImmediateU64();
if (args[2].IsImmediate()) {
auto Xflags = ctx.reg_alloc.WriteX(nzcv_inst);
RegAlloc::Realize(Xresult, Xflags, Xa);
if (args[2].GetImmediateU1()) {
AddImmWithFlags<bitsize>(as, *Xresult, *Xa, ~imm, *Xflags);
} else {
AddImmWithFlags<bitsize>(as, *Xresult, *Xa, -imm, *Xflags);
}
} else {
ASSERT_FALSE("Unimplemented");
}
} else {
ASSERT_FALSE("Unimplemented");
}
} else {
ASSERT_FALSE("Unimplemented");
}
}
template<>
void EmitIR<IR::Opcode::Sub32>(biscuit::Assembler& as, EmitContext& ctx, IR::Inst* inst) {
EmitSub<32>(as, ctx, inst);
}
} // namespace Dynarmic::Backend::RV64