Lerking/micropython
1
0
Fork 0
mirror of https://github.com/micropython/micropython.git synced 2026-01-05 03:30:14 +01:00
Code Issues Actions 52 Packages Projects Releases Wiki Activity

py/parsenum: Fix parsing of floats that are close to subnormal.

Browse Source 
Prior to this patch, a float literal that was close to subnormal would
have a loss of precision when parsed.  The worst case was something like
float('10000000000000000000e-326') which returned 0.0.
This commit is contained in:
Damien George
2018-02-08 14:02:50 +11:00
parent 0c650d4276
commit b75cb8392b
3 changed files with 22 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
tests/float/float_parse_doubleprec.py
View File

@@ -14,3 +14,8 @@ print(float('.' + '9' * 400 + 'e-100'))
print(float('.' + '0' * 400 + '9e100'))
print(float('.' + '0' * 400 + '9e200'))
print(float('.' + '0' * 400 + '9e400'))
# ensure that accuracy is retained when value is close to a subnormal
print(float('1.00000000000000000000e-307'))
print(float('10.0000000000000000000e-308'))
print(float('100.000000000000000000e-309'))