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Improve llStringLength detection, to catch more cases.

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For example, if (llStringLength(s) > 0)  ->  if (!(s == ""))
This commit is contained in:
Sei Lisa 2017-10-27 16:07:36 +02:00
parent 4c8227bae5
commit 3bb5102f06
1 changed files with 17 additions and 11 deletions
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28
lslopt/lslfoldconst.py
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@ -267,6 +267,22 @@ class foldconst(object):
return # Nothing to do if it's already simplified.
child = node['ch'] if 'ch' in node else None
if nt == 'FNCALL' and node['name'] == 'llStringLength':
# llStringLength(expr) -> !(expr == "")
node = {'nt':'==', 't':'integer',
'ch':[child[0],
{'nt':'CONST', 't':'string',
'value':u''}]}
node = {'nt':'!', 't':'integer', 'ch':[node]}
# new node is SEF if the argument to llStringLength is
if 'SEF' in child[0]:
node['SEF'] = True
node['ch'][0]['SEF'] = True
parent[index] = node
nt = '!'
child = node['ch']
# fall through to keep optimizing if necessary
if nt == '!':
self.FoldCond(child, 0, True)
@ -281,7 +297,6 @@ class foldconst(object):
self.FoldCond(parent, index, ParentIsNegation)
return
if nt in self.binary_ops and child[0]['t'] == child[1]['t'] == 'integer':
if nt == '!=':
if child[0]['nt'] == 'CONST' and child[0]['value'] == 1 \
@ -645,16 +660,6 @@ class foldconst(object):
subexpr = child[0]
snt = subexpr['nt']
if snt == 'FNCALL' and subexpr['name'] == 'llStringLength':
# !llStringLength(expr) -> expr == ""
parent[index] = {'nt':'==', 't':'integer',
'ch':[subexpr['ch'][0],
{'nt':'CONST', 't':'string',
'value':u""}]}
# new node is SEF if the argument to llStringLength is
if 'SEF' in subexpr['ch'][0]:
parent[index]['SEF'] = True
return
if 'SEF' in subexpr:
node['SEF'] = True
if subexpr['nt'] == 'CONST':
@ -1419,6 +1424,7 @@ class foldconst(object):
fn = sym['Fn']
args = [arg['value'] for arg in child]
assert len(args) == len(sym['ParamTypes'])
try:
# May raise ELSLCantCompute
if name[:10] == 'llDetected':