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[libc] Add implementations of nextafter[f|l] functions.

Authored by sivachandra on Jan 3 2021, 10:33 PM.

Description

[libc] Add implementations of nextafter[f|l] functions.

A differential fuzzer for these functions has also been added.
Along the way, a small correction has been done to the normal/subnormal
limits of x86 long double values.

Reviewed By: lntue

Differential Revision: https://reviews.llvm.org/D94109

Details

Committed
sivachandraJan 5 2021, 10:32 PM
Reviewer
lntue
Differential Revision
D94109: [libc] Add implementations of nextafter[f|l] functions.
Parents
rG993d8ac5cb93: [libc] Add implementations of nearbyint[f|l].
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