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Commit d747f015 authored by Chris Lattner's avatar Chris Lattner
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Teach instcombine to turn trunc(srl x, c) -> srl (trunc(x), c) when safe. 

This implements InstCombine/cast.ll:test34.  It fires hundreds of times on
176.gcc.

llvm-svn: 32009
parent 544dfa01
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