Misc improvements 10 #42
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This commit introduces new optimization pass - `TRILXmul2Xshl` - which
replaces
?mul
<value>
?const <power of two>
with
?shl
<value>
?const <log2 of <power of two>>
While this may not have real impact on modern CPUs, it serves as an
example of how to do simple TRIL-to-TRIL optimizations.
It is *not* included in default optimization pipeline as of now (and
may never be).
This commit silence errors produced by Pharo compiler about variables being shadowed. The way Pharo browser is handling it makes it impossible to ignore the warning (one cannot accept). Sigh.
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