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Allow (x&r) && (x&s) && (x&t) to be collapsed into a single number.

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This is an addendum to 3a849fe that allows more than two tests to be chained and optimized.
This commit is contained in:
Sei Lisa 2017-10-17 23:26:13 +02:00
parent 8d337467cb
commit 6c73ba95c2
1 changed files with 40 additions and 0 deletions
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40
lslopt/lslfoldconst.py
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@ -286,6 +286,46 @@ class foldconst(object):
del val1, val2
del a, b, c, d, and1, and2
if nt == '|':
# Absorb further flags, to allow chaining of &&
# If ~r and s are constants, and s is a power of two:
# (!~(x|~r) && x&s) -> !~(x|(~r&~s))
# This is implemented as:
# ~(x|~r) | !(x&s) -> ~(x|~(r|s))
# because that's the intermediate result after conversion of &&.
# a and b are going to be the children of the main |
# a is going to be child that has the ~
# b is the other child (with the !)
# c is the child of ~ which has x
# d is the child of ~ with the constant ~r
# e is the child of ! which has x
# f is the child of ! with the constant s
a, b = 0, 1
if child[a]['nt'] != '~':
a, b = b, a
c, d = 0, 1
if child[a]['nt'] == '~' and child[a]['ch'][0]['nt'] == '|':
if child[a]['ch'][0]['ch'][d]['nt'] != 'CONST':
c, d = d, c
e, f = 0, 1
if child[b]['nt'] == '!' and child[b]['ch'][0]['nt'] == '&':
if child[b]['ch'][0]['ch'][f]['nt'] != 'CONST':
e, f = f, e
# All pointers are ready to check applicability.
if (child[a]['nt'] == '~' and child[a]['ch'][0]['nt'] == '|'
and child[b]['nt'] == '!' and child[b]['ch'][0]['nt'] == '&'
):
ch1 = child[a]['ch'][0]['ch']
ch2 = child[b]['ch'][0]['ch']
if (ch1[d]['nt'] == 'CONST' and ch2[f]['nt'] == 'CONST'
and (ch2[f]['value'] & (ch2[f]['value'] - 1)) == 0
):
if self.CompareTrees(ch1[c], ch2[e]):
# We're in that case. Apply optimization.
parent[index] = child[a]
ch1[d]['value'] &= ~ch2[f]['value']
return
if nt in self.binary_ops and child[0]['t'] == child[1]['t'] == 'integer':
if nt == '!=':
if child[0]['nt'] == 'CONST' and child[0]['value'] == 1 \