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Scripted copyright year updates based on git committer date.
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In most cases, we mask lanes which should not trigger exceptions with
a neutral value, then let the existing special-case handler fix them
up later. For exp and exp2 we replace the more complex special-case
handler with a simple scalar fallback. All new behaviour is tested in
runulp.sh, with a new option to pass -f to the run line. We also
extend the fenv testing to Neon log and logf, which already triggered
exceptions correctly. New behaviour is mostly hidden behind a new
config setting, WANT_SIMD_EXCEPT.
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The outgoing license was MIT only. The new dual license allows
using the code under Apache-2.0 WITH LLVM-exception license too.
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The polynomials were produced by searching the coefficient space using
heuristics and ideas from https://arxiv.org/abs/1508.03211
The worst-case error is 1.886 ulp, large inputs (> 2^20) and other
special cases use scalar sinf and cosf.
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