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[IR] Add intrinsics to represent complex multiply and divide instructions.
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Authored by jcranmer-intel on Feb 8 2022, 2:09 PM.
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Summary

This patch represents the first in a series of patches to bring a more
standardized version of complex values into LLVM. Representation of the complex
multiply and division instructions are added as intrinsics, and their precise
behavior is controlled via attributes and fast-math flags.

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