diff options
Diffstat (limited to 'backend/lib/CodeGen')
| -rw-r--r-- | backend/lib/CodeGen/GlobalISel/InstructionSelect.cpp | 24 |
1 files changed, 14 insertions, 10 deletions
diff --git a/backend/lib/CodeGen/GlobalISel/InstructionSelect.cpp b/backend/lib/CodeGen/GlobalISel/InstructionSelect.cpp index 1048843..8cfb9c7 100644 --- a/backend/lib/CodeGen/GlobalISel/InstructionSelect.cpp +++ b/backend/lib/CodeGen/GlobalISel/InstructionSelect.cpp @@ -291,7 +291,9 @@ Expected<MachinePassResult> InstructionSelect::runImplementation(MachineFunction if (CurrentDescriptor == nullptr) return std::unexpected( passFailure("instruction selector encountered an unknown instruction descriptor")); - if (!CurrentDescriptor->Flags.has(InstructionFlag::Generic)) + const bool IsGeneric = CurrentDescriptor->Flags.has(InstructionFlag::Generic); + const bool IsCopy = Instruction->opcode() == opcode(GenericOpcode::COPY); + if (!IsGeneric && !IsCopy) continue; const OpcodeState Before = stateOf(*Instruction); if (!SeenStates.insert(Before).second) { @@ -322,21 +324,23 @@ Expected<MachinePassResult> InstructionSelect::runImplementation(MachineFunction if (Selected == nullptr) return std::unexpected( passFailure("instruction selector produced an unknown instruction descriptor")); - auto FlagPropagation = - Info->propagateSelectionFlags(*Instruction, InputFlags, InputMayRaiseFPException, Target); - if (!FlagPropagation) - return std::unexpected(FlagPropagation.error()); - auto Constraint = Info->constrainSelectedInstruction(*Instruction, Function, Target); - if (!Constraint) { - return std::unexpected(withErrorContext( - Constraint.error(), "instruction selector could not constrain selected registers: ")); + if (IsGeneric) { + auto FlagPropagation = + Info->propagateSelectionFlags(*Instruction, InputFlags, InputMayRaiseFPException, Target); + if (!FlagPropagation) + return std::unexpected(FlagPropagation.error()); + auto Constraint = Info->constrainSelectedInstruction(*Instruction, Function, Target); + if (!Constraint) { + return std::unexpected(withErrorContext( + Constraint.error(), "instruction selector could not constrain selected registers: ")); + } } auto Validation = Target.validateInstruction(*Instruction, Function.registerInfo()); if (!Validation) return std::unexpected(withErrorContext(Validation.error(), "instruction selector produced invalid MachineIR: ")); const OpcodeState After = stateOf(*Instruction); - if (After == Before) + if (IsGeneric && After == Before) return std::unexpected( passFailure("instruction selector reported success without observable progress", ErrorCode::InternalError)); |