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  • Dan Gohman's avatar
    Use a sign-extend instead of a zero-extend when promoting a · 8078b8bd
    Dan Gohman authored 
    trip count value when the original loop iteration condition is
signed and the canonical induction variable won't undergo signed
overflow. This isn't required for correctness; it just preserves
more information about original loop iteration values.

Add a getTruncateOrSignExtend method to ScalarEvolution,
following getTruncateOrZeroExtend.

llvm-svn: 64918
    8078b8bd