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Make *-2 and *2 only work for local variables. Needed an adition to the parser.

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Sei Lisa 2015-03-03 00:49:14 +01:00
parent d8f42a5071
commit 01f2bba2f4
2 changed files with 10 additions and 14 deletions
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22
lslopt/lslfoldconst.py
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@ -540,8 +540,8 @@ class foldconst(object):
# expr * 1 -> expr
# expr * 0 -> 0 if side-effect free
# expr * -1 -> -expr
# ident * 2 -> ident+ident
# ident * -2 -> -(ident + ident) (this can turn out to be counter-productive if ident is not a local)
# ident * 2 -> ident + ident (no gain except if ident is local)
# ident * -2 -> -(ident + ident) (this is counter-productive if ident is not local)
# expr/1 -> expr
# expr/-1 -> -expr
if nt == '*' and child[b]['t'] in ('float', 'integer') \
@ -561,17 +561,13 @@ class foldconst(object):
node['SEF'] = True
return
# only -2, 2 remain
if child[a]['nt'] == 'IDENT':
# FIXME: The -2 case is counter-productive if the var is not local.
# We don't have info on whether a variable is local yet.
# Or maybe we do; got to check. Disabled for now.
if val != -2:
child[b] = child[a].copy()
node['nt'] = '+'
if val == -2:
parent[index] = {'nt':'NEG', 't':node['t'], 'ch':[node]}
if 'SEF' in node:
parent[index]['SEF'] = True
if child[a]['nt'] == 'IDENT' and 'Local' in self.symtab[child[a]['scope']][child[a]['name']]:
child[b] = child[a].copy()
node['nt'] = '+'
if val == -2:
parent[index] = {'nt':'NEG', 't':node['t'], 'ch':[node]}
if 'SEF' in node:
parent[index]['SEF'] = True
return
return