[llvm] [InstCombine] Transform high latency, dependent FSQRT/FDIV into FMUL (PR #87474)

[Sushant Gokhale via llvm-commits]

sushgokh wrote:

> For example, what cases? I think it's quite important to try to preserve !fpmath (and a lesser extent the flags). For AMDGPU losing these can trivially result in a net loss

@bb_constraint_case1 for fast-math flags
@fpmath_metadata_on_div for fpmath metadata

https://github.com/llvm/llvm-project/pull/87474