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This is an updated version of the patch that was checked in at: http://reviews.llvm.org/rL237046 but subsequently reverted because it exposed a bug in the DAG Combiner: http://reviews.llvm.org/D9893 This time, there's an enablement flag ("EnableFMFInDAG") around the code in SelectionDAGBuilder where we copy the set of FP optimization flags from IR instructions to DAG nodes. So, in theory, there should be no functional change from this patch as-is, but it will allow testing with the added functionality to proceed via "-enable-fmf-dag" passed to llc. This patch adds the minimum plumbing necessary to use IR-level fast-math-flags (FMF) in the backend without actually using them for anything yet. This is a follow-on to: http://reviews.llvm.org/rL235997 Differential Revision: http://reviews.llvm.org/D10403 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239828 91177308-0d34-0410-b5e6-96231b3b80d8
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