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IR: Add ReplicateBit microinstruction

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This commit is contained in:
MerryMage 2020-04-20 17:56:16 +01:00
parent 8f2dcd3e21
commit f59b9fb020
5 changed files with 46 additions and 7 deletions
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32
src/backend/x64/emit_x64_data_processing.cpp
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@ -222,6 +222,38 @@ void EmitX64::EmitExtractRegister64(Dynarmic::Backend::X64::EmitContext& ctx, IR
EmitExtractRegister(code, ctx, inst, 64);
}
static void EmitReplicateBit(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst, int bit_size) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
const u8 bit = args[1].GetImmediateU8();
if (bit == bit_size - 1) {
const Xbyak::Reg result = ctx.reg_alloc.UseScratchGpr(args[0]).changeBit(bit_size);
code.sar(result, bit_size - 1);
ctx.reg_alloc.DefineValue(inst, result);
return;
}
const Xbyak::Reg value = ctx.reg_alloc.UseGpr(args[0]).changeBit(bit_size);
const Xbyak::Reg result = ctx.reg_alloc.ScratchGpr().changeBit(bit_size);
code.xor_(result, result);
code.bt(value, bit);
code.sbb(result, result);
ctx.reg_alloc.DefineValue(inst, result);
}
void EmitX64::EmitReplicateBit32(Dynarmic::Backend::X64::EmitContext& ctx, IR::Inst* inst) {
EmitReplicateBit(code, ctx, inst, 32);
}
void EmitX64::EmitReplicateBit64(Dynarmic::Backend::X64::EmitContext& ctx, IR::Inst* inst) {
EmitReplicateBit(code, ctx, inst, 64);
}
void EmitX64::EmitLogicalShiftLeft32(EmitContext& ctx, IR::Inst* inst) {
const auto carry_inst = inst->GetAssociatedPseudoOperation(IR::Opcode::GetCarryFromOp);