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Some day the backend may handle instruction-level fast math flags and make this transform unnecessary, but it's still better practice to use the canonical representation of fneg when possible (use a -0.0). This is a partial fix for PR20870 ( http://llvm.org/bugs/show_bug.cgi?id=20870 ). See also http://reviews.llvm.org/D6723. Differential Revision: http://reviews.llvm.org/D6731 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225050 91177308-0d34-0410-b5e6-96231b3b80d8
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