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106 changes: 106 additions & 0 deletions
106
packages/compiler-pico-c/src/arch/x86/backend/compilers/compileCastInstruction.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,106 @@ | ||
| import { IRCastInstruction } from 'frontend/ir/instructions'; | ||
| import { CBackendError, CBackendErrorCode } from 'backend/errors/CBackendError'; | ||
|
|
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| import { genInstruction } from 'arch/x86/asm-utils'; | ||
| import { isPrimitiveLikeType } from 'frontend/analyze'; | ||
|
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| import { X86CompilerInstructionFnAttrs } from '../../constants/types'; | ||
| import { X86CompileInstructionOutput } from './shared'; | ||
|
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| type CastInstructionCompilerAttrs = | ||
| X86CompilerInstructionFnAttrs<IRCastInstruction>; | ||
|
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| export function compileCastInstruction({ | ||
| instruction, | ||
| context, | ||
| }: CastInstructionCompilerAttrs) { | ||
| const { allocator } = context; | ||
| const { inputVar, outputVar } = instruction; | ||
| const { regs, x87regs, stackFrame, lifetime } = allocator; | ||
|
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| const output = new X86CompileInstructionOutput(); | ||
|
|
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| if ( | ||
| !isPrimitiveLikeType(inputVar.type) || | ||
| !isPrimitiveLikeType(outputVar.type) | ||
| ) { | ||
| throw new CBackendError(CBackendErrorCode.CANNOT_CAST_VARIABLES); | ||
| } | ||
|
|
||
| if (inputVar.type.isIntegral() && outputVar.type.isFloating()) { | ||
| // int -> float | ||
| const pushResult = x87regs.tryResolveIRArgAsReg({ | ||
| arg: inputVar, | ||
| castedType: outputVar.type, | ||
| allowCast: true, | ||
| }); | ||
|
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| output.appendGroup(pushResult.asm); | ||
| x87regs.tracker.setOwnership({ | ||
| ...pushResult.entry, | ||
| varName: outputVar.name, | ||
| }); | ||
| } else if (inputVar.type.isFloating() && outputVar.type.isIntegral()) { | ||
| // int -> float | ||
| const spillVar = stackFrame.allocSpillVariable( | ||
| outputVar.type.getByteSize(), | ||
| ); | ||
|
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| const spillMemAddr = stackFrame.getLocalVarStackRelAddress(spillVar.name, { | ||
| withSize: true, | ||
| }); | ||
|
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| const pushResult = x87regs.tryResolveIRArgAsReg({ | ||
| arg: inputVar, | ||
| stackTop: true, | ||
| }); | ||
|
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| const reg = regs.requestReg({ | ||
| size: outputVar.type.getByteSize(), | ||
| }); | ||
|
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| output.appendGroup( | ||
| x87regs.storeStackRegAtAddress({ | ||
| reg: pushResult.entry.reg, | ||
| address: spillMemAddr, | ||
| integral: true, | ||
| pop: !lifetime.isVariableLaterUsed( | ||
| allocator.iterator.offset, | ||
| spillVar.name, | ||
| ), | ||
| }).asm, | ||
| ); | ||
|
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| output.appendInstructions( | ||
| ...reg.asm, | ||
| genInstruction('mov', reg.value, spillMemAddr), | ||
| ); | ||
|
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| output.appendGroup(pushResult.asm); | ||
| regs.ownership.setOwnership(outputVar.name, { | ||
| reg: reg.value, | ||
| }); | ||
| } else if (outputVar.type.getByteSize() - inputVar.type.getByteSize() === 1) { | ||
| const extendedReg = regs.requestReg({ | ||
| size: outputVar.type.getByteSize(), | ||
| }); | ||
|
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| const rValue = regs.tryResolveIrArg({ | ||
| arg: inputVar, | ||
| }); | ||
|
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| output.appendInstructions( | ||
| ...extendedReg.asm, | ||
| ...rValue.asm, | ||
| genInstruction('movzx', extendedReg.value, rValue.value), | ||
| ); | ||
|
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| regs.ownership.setOwnership(outputVar.name, { | ||
| reg: extendedReg.value, | ||
| }); | ||
| } else { | ||
| regs.ownership.aliasOwnership(inputVar.name, outputVar.name); | ||
| } | ||
|
|
||
| return output; | ||
| } |
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