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Fold the children of | as conditions when | is folded as condition.

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Sei Lisa
2017-10-17 23:25:26 +02:00
parent a6a16c6e8f
commit 8d337467cb
1 changed files with 5 additions and 0 deletions
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5
lslopt/lslfoldconst.py
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@@ -245,6 +245,11 @@ class foldconst(object):
self.FoldCond(parent, index, ParentIsNegation) self.FoldCond(parent, index, ParentIsNegation)
return return
if nt == '|':
# In FoldCond(a | b), both a and b are conds themselves.
self.FoldCond(child, 0)
self.FoldCond(child, 1)
# Specific optimization to catch a bitwise test appearing frequently. # Specific optimization to catch a bitwise test appearing frequently.
# If b and c are nonzero constant powers of two: # If b and c are nonzero constant powers of two:
# !(a & b) | !(a & c) -> ~(a|~(b|c)) # !(a & b) | !(a & c) -> ~(a|~(b|c))