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emit_arm64_data_processing: Implement LogicalShiftRight32

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Merry 2022-07-24 19:01:36 +01:00 committed by merry
parent 7840caef6e
commit 6bcfaee1f4
1 changed files with 97 additions and 4 deletions
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101
src/dynarmic/backend/arm64/emit_arm64_data_processing.cpp
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@ -307,10 +307,103 @@ void EmitIR<IR::Opcode::LogicalShiftLeft64>(oaknut::CodeGenerator& code, EmitCon
template<> template<>
void EmitIR<IR::Opcode::LogicalShiftRight32>(oaknut::CodeGenerator& code, EmitContext& ctx, IR::Inst* inst) { void EmitIR<IR::Opcode::LogicalShiftRight32>(oaknut::CodeGenerator& code, EmitContext& ctx, IR::Inst* inst) {
(void)code; const auto carry_inst = inst->GetAssociatedPseudoOperation(IR::Opcode::GetCarryFromOp);
(void)ctx;
(void)inst; auto args = ctx.reg_alloc.GetArgumentInfo(inst);
ASSERT_FALSE("Unimplemented"); auto& operand_arg = args[0];
auto& shift_arg = args[1];
auto& carry_arg = args[2];
if (!carry_inst) {
if (shift_arg.IsImmediate()) {
const u8 shift = shift_arg.GetImmediateU8();
auto Wresult = ctx.reg_alloc.WriteW(inst);
auto Woperand = ctx.reg_alloc.ReadW(operand_arg);
RegAlloc::Realize(Wresult, Woperand);
if (shift <= 31) {
code.LSR(Wresult, Woperand, shift);
} else {
code.MOV(Wresult, WZR);
}
} else {
auto Wresult = ctx.reg_alloc.WriteW(inst);
auto Woperand = ctx.reg_alloc.ReadW(operand_arg);
auto Wshift = ctx.reg_alloc.ReadW(shift_arg);
RegAlloc::Realize(Wresult, Woperand, Wshift);
ctx.reg_alloc.SpillFlags();
code.AND(Wscratch0, Wshift, 0xff);
code.LSR(Wresult, Woperand, Wscratch0);
code.CMP(Wscratch0, 32);
code.CSEL(Wresult, Wresult, WZR, LT);
}
} else {
if (shift_arg.IsImmediate() && shift_arg.GetImmediateU8() == 0) {
ctx.reg_alloc.DefineAsExisting(inst, operand_arg);
ctx.reg_alloc.DefineAsExisting(carry_inst, carry_arg);
} else if (shift_arg.IsImmediate()) {
// TODO: Use RMIF
const u8 shift = shift_arg.GetImmediateU8();
if (shift < 32) {
auto Wresult = ctx.reg_alloc.WriteW(inst);
auto Wcarry_out = ctx.reg_alloc.WriteW(carry_inst);
auto Woperand = ctx.reg_alloc.ReadW(operand_arg);
RegAlloc::Realize(Wresult, Wcarry_out, Woperand);
code.UBFX(Wcarry_out, Woperand, shift - 1, 1);
code.LSL(Wcarry_out, Wcarry_out, 29);
code.LSR(Wresult, Woperand, shift);
} else if (shift > 32) {
auto Wresult = ctx.reg_alloc.WriteW(inst);
auto Wcarry_out = ctx.reg_alloc.WriteW(carry_inst);
RegAlloc::Realize(Wresult, Wcarry_out);
code.MOV(Wresult, WZR);
code.MOV(Wcarry_out, WZR);
} else {
auto Wresult = ctx.reg_alloc.WriteW(inst);
auto Wcarry_out = ctx.reg_alloc.WriteW(carry_inst);
auto Woperand = ctx.reg_alloc.ReadW(operand_arg);
RegAlloc::Realize(Wresult, Wcarry_out, Woperand);
code.LSL(Wcarry_out, Woperand, 31 - 29);
code.AND(Wcarry_out, Wcarry_out, 1 << 29);
code.MOV(Wresult, WZR);
}
} else {
auto Wresult = ctx.reg_alloc.WriteW(inst);
auto Wcarry_out = ctx.reg_alloc.WriteW(carry_inst);
auto Woperand = ctx.reg_alloc.ReadW(operand_arg);
auto Wshift = ctx.reg_alloc.ReadW(shift_arg);
auto Wcarry_in = ctx.reg_alloc.ReadW(carry_arg);
RegAlloc::Realize(Wresult, Wcarry_out, Woperand, Wshift, Wcarry_in);
ctx.reg_alloc.SpillFlags();
// TODO: Use RMIF
oaknut::Label zero, end;
code.ANDS(Wscratch1, Wshift, 0xff);
code.B(EQ, zero);
code.SUB(Wscratch0, Wshift, 1);
code.LSR(Wcarry_out, Woperand, Wscratch0);
code.LSR(Wresult, Woperand, Wshift);
code.UBFIZ(Wcarry_out, Wcarry_out, 29, 1);
code.CMP(Wscratch1, 32);
code.CSEL(Wresult, Wresult, WZR, LT);
code.CSEL(Wcarry_out, Wcarry_out, WZR, LE);
code.B(end);
code.l(zero);
code.MOV(*Wresult, Woperand);
code.MOV(*Wcarry_out, Wcarry_in);
code.l(end);
}
}
} }
template<> template<>