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update isel comment
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isel.c
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isel.c
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/* For x86_64, do the following:
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/* For x86_64, do the following:
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*
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*
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* - lower calls
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* - check that constants are used only in
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* - check that constants are used only in
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* places allowed
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* places allowed
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* - ensure immediates always fit in 32b
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* - ensure immediates always fit in 32b
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* - explicit machine register contraints
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* - expose machine register contraints
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* on instructions like division.
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* on instructions like division.
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* - implement fast locals (the streak of
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* - implement fast locals (the streak of
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* constant allocX in the first basic block)
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* constant allocX in the first basic block)
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