abs for IEEE floating point is slightly wrong.

Evaluating abs(-0) gives the answer -0. This unexpected since it breaks invariants like 1/(abs x) >= 0. So abs(-0) should be 0. This is also the norm for other languages.

Together with this change, signum should also be changed so signum(-0) is -0. This maintains the invariant abs x * signum x == x.

Trac metadata

Trac field	Value
Version	7.6.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	low
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
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Architecture

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