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Be a bit smarter when optimizing out default labels.

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(Was a TODO item). Also cosmetic changes.
This commit is contained in:
Sei Lisa 2016-05-08 03:55:55 +02:00
parent 3669bbb06e
commit 91ad438bb7
1 changed files with 16 additions and 11 deletions
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27
lslopt/lslparse.py
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@ -1695,21 +1695,26 @@ list lazy_list_set(list L, integer i, list v)
if switchcasedefault is None: if switchcasedefault is None:
if self.errmissingdefault: if self.errmissingdefault:
raise EParseMissingDefault(self) raise EParseMissingDefault(self)
# Check if it's worth adding a break. If there's no executable # Check if it's worth adding a break label. If there's no
# code, there's no point. However, this check is insufficient. # executable code, there's no point. However, this check is
# It misses SEF expressions. For that reason, this is best left # insufficient. It misses SEF expressions. For that reason,
# up to a later optimizer that knows about SEF. But we do a # this is best left up to a later optimizer that knows about
# preliminary elimination here. # SEF. But we do a preliminary elimination here.
if self.does_something(blk): if self.does_something(blk):
switchcasedefault = brk switchcasedefault = brk
self.breakstack[-1][2] = True self.breakstack[-1][2] = True
else: else:
# TODO: Keep checking until there's output-generating code. # Check if no code up to the default label does anything.
# For example, this isn't optimized due to the semicolon: # If so, remove the label and don't generate the jump.
# switch(1) { ; default: 1; } for i in xrange(len(blk)):
if blk and blk[0]['nt'] == '@' and blk[0]['name'] == switchcasedefault: node = blk[i]
switchcasedefault = None if node['nt'] == '@' and node['name'] == switchcasedefault:
del blk[0] switchcasedefault = None
del blk[i]
break
if self.does_something([node]):
break
del i, node
if switchcasedefault is not None: if switchcasedefault is not None:
prelude.append({'nt':'JUMP', 't':None, 'name':switchcasedefault, prelude.append({'nt':'JUMP', 't':None, 'name':switchcasedefault,