[all-commits] [llvm/llvm-project] a7bb8e: [Flang] Change fir.divc to perform library call ra...

[SachaBallantyne via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a7bb8e273f433cceeb547e87d04114178573496a
      https://github.com/llvm/llvm-project/commit/a7bb8e273f433cceeb547e87d04114178573496a
  Author: Sacha Ballantyne <Sacha.Ballantyne at arm.com>
  Date:   2023-04-04 (Tue, 04 Apr 2023)

  Changed paths:
    M flang/lib/Optimizer/CodeGen/CodeGen.cpp
    M flang/test/Fir/convert-to-llvm.fir

  Log Message:
  -----------
  [Flang] Change fir.divc to perform library call rather than generate inline operations.

Currently `fir.divc` is always lowered to a sequence of llvm operations to perform complex division, however this causes issues for extreme values when the calculations overflow. While this behaviour would be fine at -Ofast, this is currently the default at all levels.

This patch changes `fir.divc` to lower to a library call instead, except for when KIND=3 as there is no appropriate library call for this case.

Reviewed By: vzakhari

Differential Revision: https://reviews.llvm.org/D145808