1 //WebAssemblyRegisterInfo.td-Describe the WebAssembly Registers -*- tablegen -*-
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
11 /// This file describes the WebAssembly register classes and some nominal
12 /// physical registers.
14 //===----------------------------------------------------------------------===//
16 class WebAssemblyReg<string n> : Register<n> {
17 let Namespace = "WebAssembly";
20 class WebAssemblyRegClass<list<ValueType> regTypes, int alignment, dag regList>
21 : RegisterClass<"WebAssembly", regTypes, alignment, regList>;
23 //===----------------------------------------------------------------------===//
25 //===----------------------------------------------------------------------===//
27 // Special registers used as the frame and stack pointer.
29 // WebAssembly may someday supports mixed 32-bit and 64-bit heaps in the same
30 // application, which requires separate width FP and SP.
31 def FP32 : WebAssemblyReg<"%FP32">;
32 def FP64 : WebAssemblyReg<"%FP64">;
33 def SP32 : WebAssemblyReg<"%SP32">;
34 def SP64 : WebAssemblyReg<"%SP64">;
36 // The register allocation framework requires register classes have at least
37 // one register, so we define a few for the integer / floating point register
38 // classes since we otherwise don't need a physical register in those classes.
39 // These are also used a "types" in the generated assembly matcher.
40 def I32_0 : WebAssemblyReg<"%i32.0">;
41 def I64_0 : WebAssemblyReg<"%i64.0">;
42 def F32_0 : WebAssemblyReg<"%f32.0">;
43 def F64_0 : WebAssemblyReg<"%f64.0">;
45 def V128_0: WebAssemblyReg<"%v128">;
47 def EXCEPT_REF_0 : WebAssemblyReg<"%except_ref.0">;
49 // The value stack "register". This is an opaque entity which serves to order
50 // uses and defs that must remain in LIFO order.
51 def VALUE_STACK : WebAssemblyReg<"STACK">;
53 // The incoming arguments "register". This is an opaque entity which serves to
54 // order the ARGUMENT instructions that are emulating live-in registers and
55 // must not be scheduled below other instructions.
56 def ARGUMENTS : WebAssemblyReg<"ARGUMENTS">;
58 //===----------------------------------------------------------------------===//
60 //===----------------------------------------------------------------------===//
62 def I32 : WebAssemblyRegClass<[i32], 32, (add FP32, SP32, I32_0)>;
63 def I64 : WebAssemblyRegClass<[i64], 64, (add FP64, SP64, I64_0)>;
64 def F32 : WebAssemblyRegClass<[f32], 32, (add F32_0)>;
65 def F64 : WebAssemblyRegClass<[f64], 64, (add F64_0)>;
66 def V128 : WebAssemblyRegClass<[v4f32, v2f64, v2i64, v4i32, v16i8, v8i16], 128,
68 def EXCEPT_REF : WebAssemblyRegClass<[ExceptRef], 0, (add EXCEPT_REF_0)>;