Craig Topper 18799f4c07 [InstCombine] Allow fptrunc (fpext X)) to be reduced to a single fpext/ftrunc ...

If we are only truncating bits from the extend we should be able to just use a smaller extend.

If we are truncating more than the extend we should be able to just use a fptrunc since the presense of the fpextend shouldn't affect rounding.

Differential Revision: https://reviews.llvm.org/D43970

llvm-svn: 326595

2018-03-02 18:16:51 +00:00

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