tree b5ff5fb2bc7f2c4c0e6165e8adc7627f781d3598
parent 9ea2e7f6a495c3bb620743bedcdcb5392c302cbc
author Francis Visoiu Mistrih <francisvm@yahoo.com> 1547063175 +0000
committer Francis Visoiu Mistrih <francisvm@yahoo.com> 1547063175 +0000

[CodeGen] Ignore return sext/zext attributes of unused results for tail calls

If the caller's return type does not have a zeroext attribute but the
callee does a tail call zeroext, we won't consider the tail call during
CodeGenPrepare because the attributes don't match.

However, if the result of the tail call has no uses, it makes sense to
drop the sext/zext attributes.

Differential Revision: https://reviews.llvm.org/D56486

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@350753 91177308-0d34-0410-b5e6-96231b3b80d8