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Add IfElseSwap option

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This enables an option that was being done unconditionally: to swap the `if` and `else` branches if the condition is shorter when negated.

Enabled by default.
This commit is contained in:
Sei Lisa 2022-10-31 20:08:26 +01:00
parent e62b5ffcb6
commit 08c429f22b
8 changed files with 44 additions and 17 deletions
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2
lslopt/lslfoldconst.py
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@ -1796,7 +1796,7 @@ class foldconst(object):
self.FoldTree(child, 2)
self.FoldStmt(child, 2)
# Check if it makes sense to swap if and else branches
if not child[2].SEF:
if self.ifelseswap and not child[2].SEF:
# Check if we can gain something by negating the
# expression.
# Swap 'if' and 'else' branch when the condition has

1
lslopt/lsloptimizer.py
View file

@ -68,6 +68,7 @@ class optimizer(foldconst, renamer, deadcode, lastpass):
self.shrinknames = 'shrinknames' in options
self.constfold = 'constfold' in options
self.ifelseswap = 'ifelseswap' in options
self.optlistlength = 'listlength' in options
self.optlistadd = 'listadd' in options
self.dcr = 'dcr' in options