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emit_arm64_saturation: Implement SignedSaturatedSubWithFlag32

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Merry 2022-07-30 19:12:06 +01:00 committed by merry
parent 090e79add2
commit b059384bc0
1 changed files with 16 additions and 4 deletions
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20
src/dynarmic/backend/arm64/emit_arm64_saturation.cpp
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@ -40,10 +40,22 @@ void EmitIR<IR::Opcode::SignedSaturatedAddWithFlag32>(oaknut::CodeGenerator& cod
template<>
void EmitIR<IR::Opcode::SignedSaturatedSubWithFlag32>(oaknut::CodeGenerator& code, EmitContext& ctx, IR::Inst* inst) {
(void)code;
(void)ctx;
(void)inst;
ASSERT_FALSE("Unimplemented");
const auto overflow_inst = inst->GetAssociatedPseudoOperation(IR::Opcode::GetOverflowFromOp);
ASSERT(overflow_inst);
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
auto Wresult = ctx.reg_alloc.WriteW(inst);
auto Wa = ctx.reg_alloc.ReadW(args[0]);
auto Wb = ctx.reg_alloc.ReadW(args[1]);
auto Woverflow = ctx.reg_alloc.WriteW(overflow_inst);
RegAlloc::Realize(Wresult, Wa, Wb, Woverflow);
ctx.reg_alloc.SpillFlags();
code.SUBS(Wresult, *Wa, Wb);
code.ASR(Wscratch0, Wresult, 31);
code.EOR(Wscratch0, Wscratch0, 0x8000'0000);
code.CSEL(Wresult, Wresult, Wscratch0, VC);
code.CSET(Woverflow, VS);
}
template<>