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The changes here are based on the corresponding diffs for allowing FMF on 'select': D61917 As discussed there, we want to have fast-math-flags be a property of an FP value because the alternative (having them on things like fcmp) leads to logical inconsistency such as: https://bugs.llvm.org/show_bug.cgi?id=38086 The earlier patch for select made almost no practical difference because most unoptimized conditional code begins life as a phi (based on what I see in clang). Similarly, I don't expect this patch to do much on its own either because SimplifyCFG promptly drops the flags when converting to select on a minimal example like: https://bugs.llvm.org/show_bug.cgi?id=39535 But once we have this plumbing in place, we should be able to wire up the FMF propagation and start solving cases like that. The change to RecurrenceDescriptor::AddReductionVar() is required to prevent a regression in a LoopVectorize test. We are intersecting the FMF of any FPMathOperator there, so if a phi is not properly annotated, new math instructions may not be either. Once we fix the propagation in SimplifyCFG, it may be safe to remove that hack. Differential Revision: https://reviews.llvm.org/D67564 llvm-svn: 372866
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