7ec925122d
* Refactor the structure and responsibilities of `CodeGenContext` This commit refactors how the `CodeGenContext` is used throughout the code generation process, making it easier to pass it around when more flexibility is desired in the MacroAssembler to perform the lowering of certain instructions. As of this change, the responsibility of the `CodeGenContext` is to provide an interface for operations that require an orchestration between the register allocator, the value stack and function's frame. The MacroAssembler is removed from the CodeGenContext as is passed as a dependency where needed, effectly using it as an independent code generation interface only. By giving more responsibilities to the `CodeGenContext` we can clearly separate the concerns of the register allocator, which previously did more than it should (e.g. popping values and spilling). This change ultimately allows passing in the `CodeGenContext` to the `MacroAssembler` when a given instruction cannot be generically described through a common interface. Allowing each implementation to decide the best way to lower a particular instruction. * winch: Add support for the WebAssembly `<i32|i64>.div_*` instructions Given that some architectures have very specific requirements on how to handle division, this change uses `CodeGenContext` as a dependency to the `div` MacroAssembler instruction to ensure that each implementation can decide on how to lower the division. This approach also allows -- in architectures where division can be expressed as an ordinary binary operation -- to rely on the `CodeGenContext::i32_binop` or `CodeGenContext::i64_binop` helpers.
21 lines
558 B
Plaintext
21 lines
558 B
Plaintext
;;! target = "x86_64"
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(module
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(func (result i64)
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(i64.const 0)
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(i64.const 0)
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(i64.div_u)
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)
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)
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;; 0: 55 push rbp
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;; 1: 4889e5 mov rbp, rsp
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;; 4: 48c7c100000000 mov rcx, 0
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;; b: 48c7c000000000 mov rax, 0
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;; 12: 4883f900 cmp rcx, 0
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;; 16: 0f8502000000 jne 0x1e
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;; 1c: 0f0b ud2
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;; 1e: ba00000000 mov edx, 0
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;; 23: 48f7f1 div rcx
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;; 26: 5d pop rbp
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;; 27: c3 ret
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