Revert r307581, "Avoid doing conservative phi checks in aliasSameBasePointerGEPs() if no phis have been visited yet."
It broke stage2 tests in selfhosting.
llvm-svn: 307613
diff --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp
index 704b5eb..9e042da 100644
--- a/llvm/lib/Analysis/ValueTracking.cpp
+++ b/llvm/lib/Analysis/ValueTracking.cpp
@@ -1873,7 +1873,7 @@
if (Known.countMaxLeadingZeros() < BitWidth - ShiftVal)
return true;
// Are all the bits to be shifted out known zero?
- if (Known.isUnknown() || Known.countMinTrailingZeros() >= ShiftVal)
+ if (Known.countMinTrailingZeros() >= ShiftVal)
return isKnownNonZero(X, Depth, Q);
}
}