David Majnemer f74443e53a InstCombine: Combine (X+cst) < 0 --> X < -cst
This can happen pretty often in code that looks like:
int foo = bar - 1;
if (foo < 0)
  do stuff

In this case, bar < 1 is an equivalent condition.

This transform requires that the add instruction be annotated with nsw.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221045 91177308-0d34-0410-b5e6-96231b3b80d8
2014-11-01 09:09:51 +00:00
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