================
@@ -12367,8 +12368,17 @@ bool IntExprEvaluator::VisitBuiltinCallExpr(const
CallExpr *E,
BuiltinOp != Builtin::BI__lzcnt &&
BuiltinOp != Builtin::BI__lzcnt64;
- if (ZeroIsUndefined && !Val)
- return Error(E);
+ if (!Val) {
----------------
overmighty wrote:
Oh yeah I messed up my last reply after rewording part of it. The builtins only
make use of the second argument if the first argument is zero, and they just
return it directly and not its leading/trailing zero count.
https://github.com/llvm/llvm-project/pull/86577
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