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Make program flow more consistent, add TODO, refine another TODO.

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Sei Lisa 2015-03-28 23:47:45 +01:00
parent 01d8bba3f4
commit 08f48a5c32
1 changed files with 8 additions and 3 deletions
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11
lslopt/lslfoldconst.py
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@ -119,13 +119,16 @@ class foldconst(object):
# and optimize out ^0.
node['nt'] = '^'
self.FoldTree(parent, index)
elif nt == '==':
return
if nt == '==':
if child[0]['nt'] == 'CONST' and -1 <= child[0]['value'] <= 1 \
or child[1]['nt'] == 'CONST' and -1 <= child[1]['value'] <= 1:
# Transform a==b into !(a-b) if either a or b are in [-1, 1]
parent[index] = {'nt':'!', 't':'integer', 'ch':[node]}
node['nt'] = '-'
self.FoldTree(parent, index)
return
if nt == '|':
# In a boolean context, the operands count as booleans.
@ -190,9 +193,10 @@ class foldconst(object):
return
if nt == 'NEG':
# TODO: -(b + -c) -> -b+c, -(-b + c) -> b + -c
self.FoldTree(child, 0)
if child[0]['nt'] == 'NEG':
# Double negation: - - expr --> expr
# Double negation: - - expr -> expr
node = parent[index] = child[0]['ch'][0]
child = node['ch'] if 'ch' in node else None
elif child[0]['nt'] == 'CONST':
@ -232,7 +236,8 @@ class foldconst(object):
if subexpr['nt'] == 'CONST':
node = parent[index] = subexpr
node['value'] = int(not node['value'])
# TODO: !(i>const) to i<(const+1) if no overflow (4 variants)
# TODO: !(const < i) -> i < const+1, !(i < const) -> const-1 < i
# (if no overflow)
return
if nt == '~':