suyu/dynarmic
26
1
Fork 1
Code Issues Pull requests Projects Releases Packages Wiki Activity

emit_arm64_a32: Improve A32SetCpsr

Browse source
This commit is contained in:
Macdu 2022-10-30 01:49:36 +02:00 committed by merry
parent ad6a04c584
commit 97edb626c7
1 changed files with 43 additions and 9 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

52
src/dynarmic/backend/arm64/emit_arm64_a32.cpp
View file

@ -311,20 +311,54 @@ void EmitIR<IR::Opcode::A32GetCpsr>(oaknut::CodeGenerator& code, EmitContext& ct
code.ORR(Wcpsr, Wcpsr, Wscratch0, LSL, 5);
}
static void SetCpsrImpl(u32 value, A32JitState* jit_state) {
jit_state->SetCpsr(value);
}
template<>
void EmitIR<IR::Opcode::A32SetCpsr>(oaknut::CodeGenerator& code, EmitContext& ctx, IR::Inst* inst) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
ctx.reg_alloc.PrepareForCall(nullptr, args[0]);
auto Wcpsr = ctx.reg_alloc.ReadW(args[0]);
RegAlloc::Realize(Wcpsr);
// TODO: Inline
// NZCV, Q flags
code.AND(Wscratch0, Wcpsr, 0xF0000000);
code.AND(Wscratch1, Wcpsr, 1 << 27);
code.MOV(X1, Xstate);
code.MOV(Xscratch0, reinterpret_cast<u64>(&SetCpsrImpl));
code.BLR(Xscratch0);
static_assert(offsetof(A32JitState, cpsr_nzcv) + sizeof(u32) == offsetof(A32JitState, cpsr_q));
code.STP(Wscratch0, Wscratch1, Xstate, offsetof(A32JitState, cpsr_nzcv));
// GE flags
// this does the following:
// cpsr_ge |= mcl::bit::get_bit<19>(cpsr) ? 0xFF000000 : 0;
// cpsr_ge |= mcl::bit::get_bit<18>(cpsr) ? 0x00FF0000 : 0;
// cpsr_ge |= mcl::bit::get_bit<17>(cpsr) ? 0x0000FF00 : 0;
// cpsr_ge |= mcl::bit::get_bit<16>(cpsr) ? 0x000000FF : 0;
code.UBFX(Wscratch0, Wcpsr, 16, 4);
code.MOV(Wscratch1, 0x00204081);
code.MUL(Wscratch0, Wscratch0, Wscratch1);
code.AND(Wscratch0, Wscratch0, 0x01010101);
code.LSL(Wscratch1, Wscratch0, 8);
code.SUB(Wscratch0, Wscratch1, Wscratch0);
// Other flags
code.MOV(Wscratch1, 0x010001DF);
code.AND(Wscratch1, Wcpsr, Wscratch1);
static_assert(offsetof(A32JitState, cpsr_jaifm) + sizeof(u32) == offsetof(A32JitState, cpsr_ge));
code.STP(Wscratch1, Wscratch0, Xstate, offsetof(A32JitState, cpsr_jaifm));
// IT state
code.AND(Wscratch0, Wcpsr, 0xFC00);
code.LSR(Wscratch1, Wcpsr, 17);
code.AND(Wscratch1, Wscratch1, 0x300);
code.ORR(Wscratch0, Wscratch0, Wscratch1);
// E flag, T flag
code.LSR(Wscratch1, Wcpsr, 8);
code.AND(Wscratch1, Wscratch1, 0x2);
code.ORR(Wscratch0, Wscratch0, Wscratch1);
code.LDR(Wscratch1, Xstate, offsetof(A32JitState, upper_location_descriptor));
code.BFXIL(Wscratch0, Wcpsr, 5, 1);
code.AND(Wscratch1, Wscratch1, 0xFFFF0000);
code.ORR(Wscratch0, Wscratch0, Wscratch1);
code.STR(Wscratch0, Xstate, offsetof(A32JitState, upper_location_descriptor));
}
template<>