diff options
| -rw-r--r-- | src/video_core/engines/shader_bytecode.h | 11 | ||||
| -rw-r--r-- | src/video_core/shader/decode/bfe.cpp | 69 | ||||
| -rw-r--r-- | src/video_core/shader/node_helper.cpp | 2 |
3 files changed, 53 insertions, 29 deletions
diff --git a/src/video_core/engines/shader_bytecode.h b/src/video_core/engines/shader_bytecode.h index c9bc83cd7..eba42deb4 100644 --- a/src/video_core/engines/shader_bytecode.h +++ b/src/video_core/engines/shader_bytecode.h @@ -911,14 +911,9 @@ union Instruction { } fadd32i; union { - BitField<20, 8, u64> shift_position; - BitField<28, 8, u64> shift_length; - BitField<48, 1, u64> negate_b; - BitField<49, 1, u64> negate_a; - - u64 GetLeftShiftValue() const { - return 32 - (shift_position + shift_length); - } + BitField<40, 1, u64> brev; + BitField<47, 1, u64> rd_cc; + BitField<48, 1, u64> is_signed; } bfe; union { diff --git a/src/video_core/shader/decode/bfe.cpp b/src/video_core/shader/decode/bfe.cpp index e02bcd097..8e3b46e8e 100644 --- a/src/video_core/shader/decode/bfe.cpp +++ b/src/video_core/shader/decode/bfe.cpp @@ -17,33 +17,60 @@ 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); - - switch (opcode->get().GetId()) { - case OpCode::Id::BFE_IMM: { - UNIMPLEMENTED_IF_MSG(instr.generates_cc, - "Condition codes generation in BFE is not implemented"); + 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); + } + }(); - 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)); + UNIMPLEMENTED_IF_MSG(instr.bfe.rd_cc, "Condition codes in BFE is not implemented"); - 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 bool is_signed = instr.bfe.is_signed; - SetInternalFlagsFromInteger(bb, outer_shift, instr.generates_cc); - SetRegister(bb, instr.gpr0, outer_shift); - break; - } - default: - UNIMPLEMENTED_MSG("Unhandled BFE instruction: {}", opcode->get().GetName()); + // using reverse parallel method in + // https://graphics.stanford.edu/~seander/bithacks.html#ReverseParallel + // note for later if possible to implement faster method. + if (instr.bfe.brev) { + const auto swap = [&](u32 s, u32 mask) { + Node v1 = + SignedOperation(OperationCode::ILogicalShiftRight, is_signed, op_a, Immediate(s)); + if (mask != 0) { + v1 = SignedOperation(OperationCode::IBitwiseAnd, is_signed, std::move(v1), + Immediate(mask)); + } + Node v2 = op_a; + if (mask != 0) { + v2 = SignedOperation(OperationCode::IBitwiseAnd, is_signed, std::move(v2), + Immediate(mask)); + } + v2 = SignedOperation(OperationCode::ILogicalShiftLeft, is_signed, std::move(v2), + Immediate(s)); + return SignedOperation(OperationCode::IBitwiseOr, is_signed, std::move(v1), + std::move(v2)); + }; + op_a = swap(1, 0x55555555U); + op_a = swap(2, 0x33333333U); + op_a = swap(4, 0x0F0F0F0FU); + op_a = swap(8, 0x00FF00FFU); + op_a = swap(16, 0); } + const auto offset = 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)); + auto result = SignedOperation(OperationCode::IBitfieldExtract, is_signed, op_a, offset, bits); + SetRegister(bb, instr.gpr0, std::move(result)); + return pc; } diff --git a/src/video_core/shader/node_helper.cpp b/src/video_core/shader/node_helper.cpp index b3dcd291c..76c56abb5 100644 --- a/src/video_core/shader/node_helper.cpp +++ b/src/video_core/shader/node_helper.cpp @@ -68,6 +68,8 @@ OperationCode SignedToUnsignedCode(OperationCode operation_code, bool is_signed) return OperationCode::UBitwiseXor; case OperationCode::IBitwiseNot: return OperationCode::UBitwiseNot; + case OperationCode::IBitfieldExtract: + return OperationCode::UBitfieldExtract; case OperationCode::IBitfieldInsert: return OperationCode::UBitfieldInsert; case OperationCode::IBitCount: |