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shader_decode: Reimplement BFE instructions

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Nguyen Dac Nam 2020-03-13 12:48:01 +07:00 committed by GitHub
parent 00e9ba0603
commit 465ba30d08
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 23 additions and 21 deletions
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44
src/video_core/shader/decode/bfe.cpp
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@ -17,32 +17,34 @@ u32 ShaderIR::DecodeBfe(NodeBlock& bb, u32 pc) {
const Instruction instr = {program_code[pc]};
const auto opcode = OpCode::Decode(instr);
UNIMPLEMENTED_IF(instr.bfe.negate_b);
Node op_a = GetRegister(instr.gpr8);
op_a = GetOperandAbsNegInteger(op_a, false, instr.bfe.negate_a, false);
Node op_b = [&] {
switch (opcode->get().GetId()) {
case OpCode::Id::BFE_R:
return GetRegister(instr.gpr20);
case OpCode::Id::BFE_C:
return GetConstBuffer(instr.cbuf34.index, instr.cbuf34.GetOffset());
case OpCode::Id::BFE_IMM:
return Immediate(instr.alu.GetSignedImm20_20());
default:
UNREACHABLE();
return Immediate(0);
}
}();
switch (opcode->get().GetId()) {
case OpCode::Id::BFE_IMM: {
UNIMPLEMENTED_IF_MSG(instr.generates_cc,
"Condition codes generation in BFE is not implemented");
UNIMPLEMENTED_IF_MSG(instr.bfe.rd_cc, "Condition codes in BFE is not implemented");
UNIMPLEMENTED_IF_MSG(instr.bfe.brev, "BREV in BFE is not implemented");
const Node inner_shift_imm = Immediate(static_cast<u32>(instr.bfe.GetLeftShiftValue()));
const Node outer_shift_imm =
Immediate(static_cast<u32>(instr.bfe.GetLeftShiftValue() + instr.bfe.shift_position));
const bool is_signed = instr.bfe.is_signed;
const Node inner_shift =
Operation(OperationCode::ILogicalShiftLeft, NO_PRECISE, op_a, inner_shift_imm);
const Node outer_shift =
Operation(OperationCode::ILogicalShiftRight, NO_PRECISE, inner_shift, outer_shift_imm);
const auto start_position = SignedOperation(OperationCode::IBitfieldExtract, is_signed, op_b,
Immediate(0), Immediate(8));
const auto bits = SignedOperation(OperationCode::IBitfieldExtract, is_signed, op_b,
Immediate(8), Immediate(8));
SetInternalFlagsFromInteger(bb, outer_shift, instr.generates_cc);
SetRegister(bb, instr.gpr0, outer_shift);
break;
}
default:
UNIMPLEMENTED_MSG("Unhandled BFE instruction: {}", opcode->get().GetName());
}
auto result =
SignedOperation(OperationCode::IBitfieldExtract, is_signed, op_a, start_position, bits);
SetRegister(bb, instr.gpr0, result);
return pc;
}