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[IR] Add a dedicated FNeg IR Instruction
The IEEE-754 Standard makes it clear that fneg(x) and fsub(-0.0, x) are two different operations. The former is a bitwise operation, while the latter is an arithmetic operation. This patch creates a dedicated FNeg IR Instruction to model that behavior. Differential Revision: https://reviews.llvm.org/D53877 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@346774 91177308-0d34-0410-b5e6-96231b3b80d8
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