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Change while (cond) /*empty*/; into do /*empty*/; while (cond);

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Sei Lisa 2018-05-17 06:19:35 +02:00
parent 8f93386108
commit caf50c4e14
1 changed files with 21 additions and 13 deletions
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34
lslopt/lslfoldconst.py
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@ -116,7 +116,7 @@ class foldconst(object):
labels, and applies to a block's statement list, not to a node.
"""
maybe_label = ';' if labels else '@'
if maybe_label != node.nt != ';':
if maybe_label != node.nt != ';' and not node.SEF:
if node.nt == '{}':
for subnode in node.ch:
# Labels embedded in {} are not reachable. They do nothing.
@ -1675,18 +1675,26 @@ class foldconst(object):
# out anyway. Otherwise we just don't know if it may be infinite,
# even if every component is SEF.
self.ExpandCondition(child, 0)
self.FoldTree(child, 0)
self.FoldCond(child, 0)
if child[0].nt == 'CONST':
# See if the whole WHILE can be eliminated.
if not lslfuncs.cond(child[0].value):
# Whole statement can be removed.
parent[index] = nr(nt=';', t=None, SEF=True)
return
self.FoldTree(child, 1)
self.FoldStmt(child, 1)
return
if self.DoesSomething(child[1]):
self.ExpandCondition(child, 0)
self.FoldTree(child, 0)
self.FoldCond(child, 0)
if child[0].nt == 'CONST':
# See if the whole WHILE can be eliminated.
if not lslfuncs.cond(child[0].value):
# Whole statement can be removed.
parent[index] = nr(nt=';', t=None, SEF=True)
return
self.FoldTree(child, 1)
self.FoldStmt(child, 1)
return
# It does nothing - Turn it into a do..while
nt = node.nt = 'DO'
child[0], child[1] = child[1], child[0]
# Fall through to optimize as DO..WHILE
if nt == 'DO':
self.FoldTree(child, 0) # This one is always executed.