[PATCH] D154993: AtomicExpand: Fix expanding atomics into unconstrained FP in strictfp functions

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: kpn, foad, reames, efriedma, sepavloff, jyknight.
Herald added subscribers: StephenFan, kerbowa, hiraditya, jvesely.
Herald added a project: All.
arsenm requested review of this revision.
Herald added a subscriber: wdng.
Herald added a project: LLVM.

Ideally the normal fadd/fmin/fmax this was creating would fail the verifier.
It's probably also necessary to force off FP exception handlers in the cmpxchg
loop but we don't have a generic way to do that now.

Note strictfp builder is broken in the minnum/maxnum case


https://reviews.llvm.org/D154993

Files:
  llvm/lib/CodeGen/AtomicExpandPass.cpp
  llvm/lib/Transforms/Utils/LowerAtomic.cpp
  llvm/test/Transforms/AtomicExpand/AMDGPU/expand-atomic-rmw-fadd.ll
  llvm/test/Transforms/AtomicExpand/AMDGPU/expand-atomic-rmw-fmax.ll
  llvm/test/Transforms/AtomicExpand/AMDGPU/expand-atomic-rmw-fmin.ll
  llvm/test/Transforms/AtomicExpand/AMDGPU/expand-atomic-rmw-fsub.ll

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