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4211bbc568
"Setting" does not equal "copying". This bug has sat dormant for 2 reasons: 1. The unit test was not adequate. 2. Every current user of the "copyFastMathFlags" API is operating on a new instruction. (ie, all existing fast-math flags are off). If you copy flags to an existing instruction that has some flags on already, you will not necessarily turn them off as expected. I uncovered this bug while trying to implement a fix for PR20802. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216939 91177308-0d34-0410-b5e6-96231b3b80d8
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