[all-commits] [llvm/llvm-project] f21c24: [libc++] Fix numeric of exp(complex) at inf

[Gao, Xiang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f21c2473006f1e6f9e3e28ba70f898a0aece8cb4
      https://github.com/llvm/llvm-project/commit/f21c2473006f1e6f9e3e28ba70f898a0aece8cb4
  Author: Xiang Gao <qasdfgtyuiop at gmail.com>
  Date:   2021-10-28 (Thu, 28 Oct 2021)

  Changed paths:
    M libcxx/include/complex
    M libcxx/test/std/numerics/complex.number/cases.h
    M libcxx/test/std/numerics/complex.number/complex.transcendentals/exp.pass.cpp

  Log Message:
  -----------
  [libc++] Fix numeric of exp(complex) at inf

This fixes the bug that exp({501, 0}) returns {inf, nan} instead
of {inf, 0}.

Differential Revision: https://reviews.llvm.org/D112277


  Commit: de493a26b9709fde96938c9e34bd817d0e0b1f6a
      https://github.com/llvm/llvm-project/commit/de493a26b9709fde96938c9e34bd817d0e0b1f6a
  Author: Xiang Gao <qasdfgtyuiop at gmail.com>
  Date:   2021-10-28 (Thu, 28 Oct 2021)

  Changed paths:
    M libcxx/include/complex
    M libcxx/test/std/numerics/complex.number/complex.transcendentals/tanh.pass.cpp

  Log Message:
  -----------
  [libc++] Fix buggy numerics of tanh(complex) at inf

Because:
    lim[x->inf, tanh(x+iy)] = 1
    lim[x->-inf, tanh(x+iy)] = -1

See also https://github.com/NVIDIA/libcudacxx/pull/210

Differential Revision: https://reviews.llvm.org/D112252


Compare: https://github.com/llvm/llvm-project/compare/627fa0b9a897...de493a26b970