[#97536] [Ruby master Bug#16694] JIT vs hardened GCC with PCH — v.ondruch@...
Issue #16694 has been reported by vo.x (Vit Ondruch).
11 messages
2020/03/18
[ruby-core:97518] [Ruby master Bug#12548] Rounding modes inconsistency between round versus sprintf
From:
matz@...
Date:
2020-03-16 08:02:45 UTC
List:
ruby-core #97518
Issue #12548 has been updated by matz (Yukihiro Matsumoto).
Status changed from Open to Closed
It is inconsistent but fixing either way could cause problems. I vote for keeping as it is.
Matz.
----------------------------------------
Bug #12548: Rounding modes inconsistency between round versus sprintf
https://bugs.ruby-lang.org/issues/12548#change-84672
* Author: unclekiki (Kieran McCusker)
* Status: Closed
* Priority: Normal
* ruby -v: 2.4.0
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
Hi
I've found this possible bug with `sprintf` in our production code, but it
seems very odd that no one has reported it so I'm doubting myself.
I've tested a few versions (CRuby 2.3.1 and 2.1.9) and it was present in
both.
To reproduce in irb:
```ruby
sprintf('%1.0f', 12.5)
```
Expected result 13 actual 12
In fact if you look at the number sequence 0.5 -> 99.5 you find the even
half will all round down and the odd half round up. 12.5.round produces the correct result (13)
If you do the same in jruby 2.2.1 you get the expected result of 13.
Many thanks
Kieran
---Files--------------------------------
round_even.patch (4.43 KB)
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