[PATCH] D23134: Make cltz and cttz zero undef when the operand cannot be zero in InstCombine

[Amaury SECHET via llvm-commits]

deadalnix created this revision.
deadalnix added reviewers: majnemer, spatel.
deadalnix added a subscriber: llvm-commits.

Also add popcount(n) == bitsize(n)  -> n == -1 transformation.

https://reviews.llvm.org/D23134

Files:
  lib/Transforms/InstCombine/InstCombineCalls.cpp
  lib/Transforms/InstCombine/InstCombineCompares.cpp
  test/Transforms/InstCombine/intrinsics.ll

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