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Optimize bool|1, bool&1 when possible.

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a & 1 is always a, if a is boolean.

a | 1 is always 1, if a is boolean, but it can only be optimized out if a is side effect-free.
This commit is contained in:
Sei Lisa 2017-08-02 01:40:48 +02:00
parent 3f61e6f7bf
commit 44e0db96d2
1 changed files with 4 additions and 2 deletions
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6
lslopt/lslfoldconst.py
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@ -824,13 +824,15 @@ class foldconst(object):
if child[b]['nt'] == 'CONST':
val = child[b]['value']
if val == 0 and nt == '|' or val == -1 and nt == '&':
if nt == '|' and val == 0 or nt == '&' and (val == -1 or val == 1 and self.IsBool(child[a])):
# a|0 -> a
# a&-1 -> a
# a&1 -> a if a is boolean
parent[index] = child[a]
return
if val == -1 and nt == '|' or val == 0 and nt == '&':
if nt == '|' and (val == -1 or val == 1 and self.IsBool(child[a])) or nt == '&' and val == 0:
# a|-1 -> -1 if a is SEF
# a|1 -> 1 if a is bool and SEF
# a&0 -> 0 if a is SEF
if 'SEF' in child[a]:
parent[index] = child[b]