Craig Topper 88c64f324f [ConstantRange] Optimize APInt creation in getSignedMax/getSignedMin. ...

We were creating an APInt at the top of these methods that isn't always returned. For ranges wider than 64-bits this results in an allocation and deallocation when its not used.

In getSignedMax we were creating Upper-1 to use in a compare and then creating it again for a return value. The compiler is unable to determine that these can be shared. So help it out and create the Upper-1 in a temporary that can be reused.

This provides a little compile time improvement.

llvm-svn: 300621

2017-04-18 23:02:39 +00:00

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