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thumb32: Simplify existing store functions into helper function

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We can also make a STM helper.
This commit is contained in:
Lioncash 2021-03-12 19:30:28 -05:00
parent 0d887d9ecd
commit ae83713f4f
1 changed files with 20 additions and 25 deletions
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45
src/frontend/A32/translate/impl/thumb32_load_store_multiple.cpp
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@ -36,6 +36,21 @@ static bool LDMHelper(A32::IREmitter& ir, bool W, Reg n, u32 list,
return true; return true;
} }
static bool STMHelper(A32::IREmitter& ir, bool W, Reg n, u32 list,
const IR::U32& start_address, const IR::U32& writeback_address) {
auto address = start_address;
for (size_t i = 0; i <= 14; i++) {
if (Common::Bit(i, list)) {
ir.WriteMemory32(address, ir.GetRegister(static_cast<Reg>(i)));
address = ir.Add(address, ir.Imm32(4));
}
}
if (W) {
ir.SetRegister(n, writeback_address);
}
return true;
}
bool ThumbTranslatorVisitor::thumb32_LDMIA(bool W, Reg n, Imm<16> reg_list) { bool ThumbTranslatorVisitor::thumb32_LDMIA(bool W, Reg n, Imm<16> reg_list) {
const auto regs_imm = reg_list.ZeroExtend(); const auto regs_imm = reg_list.ZeroExtend();
const auto num_regs = static_cast<u32>(Common::BitCount(regs_imm)); const auto num_regs = static_cast<u32>(Common::BitCount(regs_imm));
@ -75,18 +90,9 @@ bool ThumbTranslatorVisitor::thumb32_STMIA(bool W, Reg n, Imm<15> reg_list) {
return UnpredictableInstruction(); return UnpredictableInstruction();
} }
IR::U32 address = ir.GetRegister(n); const auto start_address = ir.GetRegister(n);
for (size_t i = 0; i < 15; i++) { const auto writeback_address = ir.Add(start_address, ir.Imm32(num_regs * 4));
if (Common::Bit(i, regs_imm)) { return STMHelper(ir, W, n, regs_imm, start_address, writeback_address);
ir.WriteMemory32(address, ir.GetRegister(static_cast<Reg>(i)));
address = ir.Add(address, ir.Imm32(4));
}
}
if (W) {
ir.SetRegister(n, address);
}
return true;
} }
bool ThumbTranslatorVisitor::thumb32_STMDB(bool W, Reg n, Imm<15> reg_list) { bool ThumbTranslatorVisitor::thumb32_STMDB(bool W, Reg n, Imm<15> reg_list) {
@ -103,20 +109,9 @@ bool ThumbTranslatorVisitor::thumb32_STMDB(bool W, Reg n, Imm<15> reg_list) {
return UnpredictableInstruction(); return UnpredictableInstruction();
} }
// Start address is the same as the writeback address.
const IR::U32 start_address = ir.Sub(ir.GetRegister(n), ir.Imm32(4 * num_regs)); const IR::U32 start_address = ir.Sub(ir.GetRegister(n), ir.Imm32(4 * num_regs));
IR::U32 address = start_address; return STMHelper(ir, W, n, regs_imm, start_address, start_address);
for (size_t i = 0; i < 15; i++) {
if (Common::Bit(i, regs_imm)) {
ir.WriteMemory32(address, ir.GetRegister(static_cast<Reg>(i)));
address = ir.Add(address, ir.Imm32(4));
}
}
if (W) {
ir.SetRegister(n, start_address);
}
return true;
} }
} // namespace Dynarmic::A32 } // namespace Dynarmic::A32