[all-commits] [llvm/llvm-project] 30abc1: [ConstantFolding] Eliminate atan and atan2 calls

[mohammed-nurulhoque via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 30abc1a6a18e843fd0470157d4d2ec285aaac8cd
      https://github.com/llvm/llvm-project/commit/30abc1a6a18e843fd0470157d4d2ec285aaac8cd
  Author: Mohammed Nurul Hoque <mohammed.nurulhoque at imgtec.com>
  Date:   2022-08-10 (Wed, 10 Aug 2022)

  Changed paths:
    M llvm/lib/Analysis/ConstantFolding.cpp
    M llvm/test/Transforms/EarlyCSE/atan.ll
    M llvm/test/Transforms/EarlyCSE/math-1.ll
    M llvm/test/Transforms/EarlyCSE/math-2.ll

  Log Message:
  -----------
  [ConstantFolding] Eliminate atan and atan2 calls

>From the opengroup specifications, atan2 may fail if the result
underflows and atan may fail if the argument is subnormal, but
we assume that does not happen and eliminate the calls if we
can constant fold the result at compile-time.

Differential Revision: https://reviews.llvm.org/D127964