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Symbols in the source file are still limited in
length because the rest of the code assumes that
strings always fit in NString bytes.
Regardless, there is already a benefit because
comparing/copying symbol names does not require
using strcmp()/strcpy() anymore.
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When eliminating `load %foo`, don't limit the
search to the live range of %foo, but to the
live range of its aliasing information.
For example, if %foo is a constant offset into
a stack-allocated slot,
%foo =l add %slot, 42
the search will proceed on all the code in
which %slot is live, not only below the
definition of %foo, like before.
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The assertion was invalid, I was assuming il->blk was
b when writing it. The new assertion should be right:
If the loop level were to decrease we would get out of
a cycle in cfg, this should not be possible unless we
go through a block with more than 1 predecessor.
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The assertion fails incorrectly on a block right
after the end of a loop.
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