[pypy-issue] Issue #3024: PyPy3 much slower than PyPy2 for decimal calculations (pypy/pypy)

[Platon]

New issue 3024: PyPy3 much slower than PyPy2 for decimal calculations
https://bitbucket.org/pypy/pypy/issues/3024/pypy3-much-slower-than-pypy2-for-decimal

Platon Pronko:

The following code takes much longer when using PyPy3 instead of PyPy2:

```python
from decimal import Decimal

s = Decimal("0")
d = Decimal("0.0000001")
i = 0
while i < 10000000:
    s += d
    i += 1
print(s)
```

Runtimes on my machine:

```
$ time pypy slowdown.py 
1.0000000

real    0m1.899s
user    0m1.850s
sys     0m0.040s
$ time pypy3 slowdown.py 
1.0000000

real    0m24.475s
user    0m24.305s
sys     0m0.054s
```

Versions:

```
$ pypy --version
Python 2.7.13 (8cdda8b8cdb8ff29d9e620cccd6c5edd2f2a23ec, Apr 23 2019, 17:07:51)
[PyPy 7.1.1 with GCC 8.3.0]
$ pypy3 --version
Python 3.6.1 (784b254d669919c872a505b807db8462b6140973, May 09 2019, 13:17:30)
[PyPy 7.1.1-beta0 with GCC 8.3.0]
```
OS: Arch Linux, `Linux 5.1.5-arch1-2-ARCH #1 SMP PREEMPT Mon May 27 03:37:39 
UTC 2019 x86_64 GNU/Linux`


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