Common Subexpression Elimination. An optimization that removes common
subexpression compuation. For example ``(a+b)*(a+b)`` has two subexpressions
that are the same: ``(a+b)``. This optimization would perform the addition
- only once and then perform the multiply (but only if it's compulationally
+ only once and then perform the multiply (but only if it's computationally
correct/safe).
D
**MC**
Machine Code
+N
+-
+
+**NFC**
+ "No functional change". Used in a commit message to indicate that a patch
+ is a pure refactoring/cleanup.
+ Usually used in the first line, so it is visible without opening the
+ actual commit email.
+
O
-
.. _object pointer:
``Constant::replaceUsesOfWithOnConstant()`` implement the replacement of one
Value with another by iterating over its def/use chain and fixing up all of
the pointers to point to the new value. See
- also `def/use chains <ProgrammersManual.html#iterate_chains>`_.
+ also `def/use chains <ProgrammersManual.html#iterating-over-def-use-use-def-chains>`_.
**Reassociation**
Rearranging associative expressions to promote better redundancy elimination