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Faster version of liberty_float - gives a 25% to 50% speedup 

This also fixes a bug in liberty_float for numbers with a magnitute
between 9 and 15.

Previously:
    >>> liberty_float(1e15)
    '1000000000000000'
    >>> liberty_float(1e10)
    '10000000000.'
    >>> liberty_float(1e9)
    '1000000000.0'
    >>> liberty_float(1e16)
    '1.000000e+16'

Now:
    >>> liberty_float(1e15)
    '1.000000e+15'
    >>> liberty_float(1e10)
    '1.000000e+10'
    >>> liberty_float(1e9)
    '1000000000.0'
    >>> liberty_float(1e16)
    '1.000000e+16'
This commit is contained in:
Rob Taylor 2020-12-20 23:19:31 +00:00 committed by Rob Taylor
parent 3d7617a1ac
commit d99d853ef9
1 changed files with 14 additions and 22 deletions
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36
scripts/python-skywater-pdk/skywater_pdk/liberty.py
View File

@ -31,12 +31,15 @@ from collections import defaultdict
from typing import Tuple, List, Dict
from math import frexp, log2
from . import sizes
from .utils import sortable_extracted_numbers
debug = False
LOG2_10 = log2(10)
class TimingType(enum.IntFlag):
"""
@ -792,36 +795,25 @@ def liberty_float(f):
"""
try:
f2 = float(f)
r = float(f)
except (ValueError, TypeError):
f2 = None
r = None
if isinstance(f, bool):
f2 = None
r = None
if f is None or f2 != f:
if f is None or r != f:
raise ValueError("%r is not a float" % f)
WIDTH = len(str(0.0083333333))
width = 11
s = json.dumps(f)
if 'e' in s:
a, b = s.split('e')
if '.' not in a:
a += '.'
while len(a)+len(b)+1 < WIDTH:
a += '0'
s = "%se%s" % (a, b)
elif '.' in s:
while len(s) < WIDTH:
s += '0'
mag = int(frexp(r)[1]/LOG2_10)
if mag > 9:
return f'%{width}e' % r
if mag < 0:
return f"%{width+1}.{width-1}f" % r
else:
if len(s) < WIDTH:
s += '.'
while len(s) < WIDTH:
s += '0'
return s
return f"%{width+1}.{width-mag-1}f" % r
LIBERTY_ATTRIBUTE_TYPES = {
'boolean': liberty_bool,