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Commit c7f3c1a0 authored by Chris Lattner's avatar Chris Lattner
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Implement InstCombine/add.ll:test28, transforming C1-(X+C2) --> (C1-C2)-X. 

This occurs several dozen times in specint2k, particularly in crafty and gcc
apparently.

llvm-svn: 21136
parent dd83183c
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