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Issue 21606 - pow(NaN,0) gives 1 not NaN
Summary: pow(NaN,0) gives 1 not NaN
Status: RESOLVED INVALID
Alias: None
Product: D
Classification: Unclassified
Component: phobos (show other issues)
Version: D2
Hardware: x86_64 Linux
: P1 normal
Assignee: No Owner
URL:
Keywords: pull
Depends on:
Blocks:
 
Reported: 2021-02-03 11:40 UTC by Berni44
Modified: 2021-03-01 14:34 UTC (History)
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Description Berni44 2021-02-03 11:40:36 UTC 
unittest
{
    assert(isNaN(pow(float.nan,0)));
    assert(isNaN(pow(double.nan,0)));
    assert(isNaN(pow(real.nan,0)));
}
Comment 1 Berni44 2021-02-03 11:42:42 UTC 
I've created a fix already, but have to wait for PR #7783 to be merged.
Comment 2 Dlang Bot 2021-03-01 14:11:08 UTC 
@berni44 created dlang/phobos pull request #7819 "Fix Issue 21606 - pow(NaN,0) gives 1 not NaN" fixing this issue:

- Fix Issue 21606 - pow(NaN,0) gives 1 not NaN

https://github.com/dlang/phobos/pull/7819
Comment 3 Berni44 2021-03-01 14:34:49 UTC 
I just found out, that this is a weird exception of the rule, that all calculations including NaNs should be NaN...