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If a is Nan, fsat(NaN) is expected to be 0 and some optimizations should be marked as inexact. Fixes a GPU hang with Death Stranding and RADV/ACO (RADV/LLVM isn't affected because it lowers fsat). No fossils-db change. Closes: mesa#3368 Cc: mesa-stable Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com> Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com> Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl> Reviewed-by: Rhys Perry <pendingchaos02@gmail.com> Part-of: <mesa!6519> (cherry picked from commit bc123c39)
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