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nexedi
cython
Commits
e76ea8ef
Commit
e76ea8ef
authored
Jul 05, 2009
by
Stefan Behnel
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fix constant folding: calculate float values but do not aggregate them into ConstNodes
parent
6328f1a2
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1
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30 additions
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21 deletions
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-21
Cython/Compiler/Optimize.py
Cython/Compiler/Optimize.py
+30
-21
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Cython/Compiler/Optimize.py
View file @
e76ea8ef
...
...
@@ -894,34 +894,43 @@ class ConstantFolding(Visitor.VisitorTransform, SkipDeclarations):
self
.
_calculate_const
(
node
)
if
node
.
constant_result
is
ExprNodes
.
not_a_constant
:
return
node
if
isinstance
(
node
.
constant_result
,
float
):
# We calculate float constants to make them available to
# the compiler, but we do not aggregate them into a
# constant node to prevent any loss of precision.
return
node
if
not
isinstance
(
node
.
operand1
,
ExprNodes
.
ConstNode
)
or
\
not
isinstance
(
node
.
operand1
,
ExprNodes
.
ConstNode
):
# We calculate other constants to make them available to
# the compiler, but we only aggregate constant nodes
# recursively, so non-const nodes are straight out.
return
node
# now inject a new constant node with the calculated value
try
:
if
node
.
operand1
.
type
is
None
or
node
.
operand2
.
type
is
None
:
type1
,
type2
=
node
.
operand1
.
type
,
node
.
operand2
.
type
if
type1
is
None
or
type2
is
None
:
return
node
except
AttributeError
:
return
node
type1
,
type2
=
node
.
operand1
.
type
,
node
.
operand2
.
type
if
isinstance
(
node
.
operand1
,
ExprNodes
.
ConstNode
)
and
\
isinstance
(
node
.
operand1
,
ExprNodes
.
ConstNode
):
if
type1
is
type2
:
if
type1
is
type2
:
new_node
=
node
.
operand1
else
:
widest_type
=
PyrexTypes
.
widest_numeric_type
(
type1
,
type2
)
if
type
(
node
.
operand1
)
is
type
(
node
.
operand2
):
new_node
=
node
.
operand1
new_node
.
type
=
widest_type
elif
type1
is
widest_type
:
new_node
=
node
.
operand1
elif
type2
is
widest_type
:
new_node
=
node
.
operand2
else
:
widest_type
=
PyrexTypes
.
widest_numeric_type
(
type1
,
type2
)
if
type
(
node
.
operand1
)
is
type
(
node
.
operand2
):
new_node
=
node
.
operand1
new_node
.
type
=
widest_type
elif
type1
is
widest_type
:
new_node
=
node
.
operand1
elif
type2
is
widest_type
:
new_node
=
node
.
operand2
else
:
target_class
=
self
.
_widest_node_class
(
node
.
operand1
,
node
.
operand2
)
if
target_class
is
None
:
return
node
new_node
=
target_class
(
type
=
widest_type
)
else
:
return
node
target_class
=
self
.
_widest_node_class
(
node
.
operand1
,
node
.
operand2
)
if
target_class
is
None
:
return
node
new_node
=
target_class
(
pos
=
node
.
pos
,
type
=
widest_type
)
new_node
.
constant_result
=
node
.
constant_result
new_node
.
value
=
str
(
node
.
constant_result
)
...
...
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