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[X86][CodeGen] Add base atan2 intrinsic lowering (p4) (llvm#110760)
This change is part of this proposal: https://discourse.llvm.org/t/rfc-all-the-math-intrinsics/78294 Based on example PR llvm#96222 and fix PR llvm#101268, with some differences due to 2-arg intrinsic and intermediate refactor (RuntimeLibCalls.cpp). - Add llvm.experimental.constrained.atan2 - Intrinsics.td, ConstrainedOps.def, LangRef.rst - Add to ISDOpcodes.h and TargetSelectionDAG.td, connect to intrinsic in BasicTTIImpl.h, and LibFunc_ in SelectionDAGBuilder.cpp - Update LegalizeDAG.cpp, LegalizeFloatTypes.cpp, LegalizeVectorOps.cpp, and LegalizeVectorTypes.cpp - Update isKnownNeverNaN in SelectionDAG.cpp - Update SelectionDAGDumper.cpp - Update libcalls - RuntimeLibcalls.def, RuntimeLibcalls.cpp - TargetLoweringBase.cpp - Expand for vectors, promote f16 - X86ISelLowering.cpp - Expand f80, promote f32 to f64 for MSVC Part 4 for Implement the atan2 HLSL Function llvm#70096.
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