Remove ancient register allocation (#3401)

cranelift/codegen/src/machinst/adapter.rs

@@ -1,20 +1,14 @@
 //! Adapter for a `MachBackend` to implement the `TargetIsa` trait.
 
-use crate::binemit;
 use crate::ir;
-use crate::isa::{EncInfo, Encoding, Encodings, Legalize, RegClass, RegInfo, TargetIsa};
+use crate::isa::{RegInfo, TargetIsa};
 use crate::machinst::*;
-use crate::regalloc::RegisterSet;
 use crate::settings::{self, Flags};
 
-#[cfg(feature = "testing_hooks")]
-use crate::regalloc::RegDiversions;
-
 #[cfg(feature = "unwind")]
 use crate::isa::unwind::systemv::RegisterMappingError;
 
 use core::any::Any;
-use std::borrow::Cow;
 use std::fmt;
 use target_lexicon::Triple;
 
@@ -74,60 +68,6 @@ impl TargetIsa for TargetIsaAdapter {
         }
     }
 
-    fn legal_encodings<'a>(
-        &'a self,
-        _func: &'a ir::Function,
-        _inst: &'a ir::InstructionData,
-        _ctrl_typevar: ir::Type,
-    ) -> Encodings<'a> {
-        panic!("Should not be called when new-style backend is available!")
-    }
-
-    fn encode(
-        &self,
-        _func: &ir::Function,
-        _inst: &ir::InstructionData,
-        _ctrl_typevar: ir::Type,
-    ) -> Result<Encoding, Legalize> {
-        panic!("Should not be called when new-style backend is available!")
-    }
-
-    fn encoding_info(&self) -> EncInfo {
-        panic!("Should not be called when new-style backend is available!")
-    }
-
-    fn legalize_signature(&self, _sig: &mut Cow<ir::Signature>, _current: bool) {
-        panic!("Should not be called when new-style backend is available!")
-    }
-
-    fn regclass_for_abi_type(&self, _ty: ir::Type) -> RegClass {
-        panic!("Should not be called when new-style backend is available!")
-    }
-
-    fn allocatable_registers(&self, _func: &ir::Function) -> RegisterSet {
-        panic!("Should not be called when new-style backend is available!")
-    }
-
-    fn prologue_epilogue(&self, _func: &mut ir::Function) -> CodegenResult<()> {
-        panic!("Should not be called when new-style backend is available!")
-    }
-
-    #[cfg(feature = "testing_hooks")]
-    fn emit_inst(
-        &self,
-        _func: &ir::Function,
-        _inst: ir::Inst,
-        _divert: &mut RegDiversions,
-        _sink: &mut dyn binemit::CodeSink,
-    ) {
-        panic!("Should not be called when new-style backend is available!")
-    }
-
-    /// Emit a whole function into memory.
-    fn emit_function_to_memory(&self, _func: &ir::Function, _sink: &mut binemit::MemoryCodeSink) {
-        panic!("Should not be called when new-style backend is available!")
-    }
-
     fn get_mach_backend(&self) -> Option<&dyn MachBackend> {
         Some(&*self.backend)
     }