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Add some FIXMEs and TODOs, remove comment that no longer makes sense.

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Sei Lisa 2015-02-28 20:39:23 +01:00
parent 0ca5a8f5b0
commit 762bf1f27b
1 changed files with 8 additions and 1 deletions
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9
lslopt/lslfoldconst.py
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@ -411,6 +411,7 @@ class foldconst(object):
or rval['ch'][1]['nt'] == 'CONST'): or rval['ch'][1]['nt'] == 'CONST'):
# const + (expr + const) or const + (const + expr) # const + (expr + const) or const + (const + expr)
# same as above, join them # same as above, join them
# FIXME: Isn't this covered by the associative sum above?
pass # TODO: implement pass # TODO: implement
@ -419,7 +420,6 @@ class foldconst(object):
lval, lnt, rval, rnt = rval, rnt, lval, lnt lval, lnt, rval, rnt = rval, rnt, lval, lnt
RSEF = 'SEF' in rval RSEF = 'SEF' in rval
# Fix n*5+1 outputing -~n*5 instead of -~(n*5).
if lval['value'] == -1 or lval['value'] == -2: if lval['value'] == -1 or lval['value'] == -2:
if rnt == 'NEG': # Cancel the NEG if rnt == 'NEG': # Cancel the NEG
node = {'nt':'~', 't':optype, 'ch':rval['ch']} node = {'nt':'~', 't':optype, 'ch':rval['ch']}
@ -577,6 +577,13 @@ class foldconst(object):
# a>2147483647 to FALSE if SEF, otherwise convert to a&0 # a>2147483647 to FALSE if SEF, otherwise convert to a&0
# a<-2147483648 to FALSE if SEF, otherwise convert to a&0 # a<-2147483648 to FALSE if SEF, otherwise convert to a&0
# TODO: Try to optimize -(expr*-const).
# That would yield optimal ~(~expr*blah) from (expr+1)*blah-1.
# Also it would be cute if a*b+b would be optimized to (a+1)*b,
# which is the other form common in strided lists.
# TODO: See what can be done with bool(a|!!b)
if nt in ('&', '|'): if nt in ('&', '|'):
# Deal with operands in any order # Deal with operands in any order
a, b = 0, 1 a, b = 0, 1