[PATCH] D25847: [ValueTracking] Don't assume we can speculate shifts

[Michael Kuperstein via llvm-commits]

mkuper created this revision.
mkuper added reviewers: davide, hfinkel, majnemer.
mkuper added a subscriber: llvm-commits.

Shifts are only isSafeToSpeculativelyExecute if we know the amount we're shifting by is smaller than the bitwidth of the shifted value.

This fixes PR30708


https://reviews.llvm.org/D25847

Files:
  lib/Analysis/ValueTracking.cpp
  test/Transforms/SimplifyCFG/speculat-shift.ll

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