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someinst1
2020 Feb 24
5
[RFC] DebugInfo: A different way of specifying variable locations post-isel
...one earlier in the compiler. Under the model described
above, we can specify a program location before the corresponding
machine location containing the variable value machine location
becomes available. Consider this code:
DBG_VALUE output-of-this-inst ---
someinst1 |
someinst2 |
$rax = ADD32ri $rax, 0 <-----
Where the line from DBG_VALUE to ADD32ri represents some
as-yet-undetermined way of identifying the ADD32ri instruction from
the DBG_VALUE. We can interpret such a code sequence as the variable
having no location across someinst1 and...