[ConstantRange] Add assertion for KnownBits validity; NFC

Following the suggestion in D59475. llvm-svn: 356346
2019-03-17 21:25:32 +00:00 · 2019-03-17 21:25:32 +00:00 · 5e7b62de05
parent 322e2dbee1
commit 5e7b62de05
1 changed files with 2 additions and 0 deletions
--- a/llvm/lib/IR/ConstantRange.cpp
+++ b/llvm/lib/IR/ConstantRange.cpp
@ -56,6 +56,8 @@ ConstantRange::ConstantRange(APInt L, APInt U)

 ConstantRange ConstantRange::fromKnownBits(const KnownBits &Known,
                                           bool IsSigned) {
+  assert(!Known.hasConflict() && "Expected valid KnownBits");
+
  if (Known.isUnknown())
    return ConstantRange(Known.getBitWidth(), /* full */ true);