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| | Some
instructions have implicit sources or |
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| destinations |
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| | E.g. CALL |
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| | Temporaries hold
arguments |
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| | So they dont
appear in the assembly code |
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| | However they
must be LIVE until the point of the |
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| call, and so
are included in sources list of the call |
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| | Also, certain
registers trashed caller-saves |
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| | Mark these as destinations
of the call to signal |
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| that previous
value no longer live |
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