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Sei Lisa 2015-03-02 23:28:14 +01:00
parent 3b7e461d82
commit c650ad26f8
1 changed files with 12 additions and 12 deletions
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24
lslopt/lslfoldconst.py
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@ -44,8 +44,9 @@ class foldconst(object):
def IsBool(self, node):
"""Some operators return 0 or 1, and that allows simplification of
boolean expressions. This function tells whether we know for sure
that the result is boolean."""
boolean expressions. This function returns whether we know for sure
that the result is boolean.
"""
return False # TODO: implement IsBool
# Ideas include some functions like llSameGroup and llDetectedGroup.
@ -93,6 +94,7 @@ class foldconst(object):
self.FoldTree(parent, index)
if nt == '|':
#TODO: simplify !!a|b or a|!!b -> a|b
a, b = 0, 1
if child[a]['nt'] == 'CONST':
a, b = 1, 0
@ -506,6 +508,11 @@ class foldconst(object):
child[0] = child[0]['ch'][0]
child[1] = child[1]['ch'][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.
# Deal with operands in any order
a, b = 0, 1
if child[a]['nt'] == 'CONST' and child[a]['t'] in ('float', 'integer'):
@ -573,16 +580,9 @@ class foldconst(object):
# (a<=b) to !(a>b)
# (a>=b) to !(a<b)
# (a!=b) to !(a==b)
# !(a>const) to a<(const+1) if no overflow (4 variants)
# a>2147483647 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)
# !(i>const) to i<(const+1) if no overflow (4 variants)
# i>2147483647 to FALSE if SEF, otherwise convert to a&0
# i<-2147483648 to FALSE if SEF, otherwise convert to a&0
if nt in ('&', '|'):
# Deal with operands in any order