[PATCH] D141192: [Clang] Add warnings on bad shifts inside enums.

[Dmitriy Chestnykh via Phabricator via cfe-commits]

chestnykh added a comment.

In D141192#4033591 <https://reviews.llvm.org/D141192#4033591>, @shafik wrote:

> So it looks like in `handleIntIntBinOp` we do hit this code:
>
>   unsigned SA = (unsigned) RHS.getLimitedValue(LHS.getBitWidth()-1);
>    if (SA != RHS) {
>      Info.CCEDiag(E, diag::note_constexpr_large_shift)
>        << RHS << E->getType() << LHS.getBitWidth();
>
> So maybe we should figure out why we decide not to emit this diagnostic and fix it there.

In the comment above: "
// C++11 [expr.shift]p1: Shift width must be less than the bit width of
// the shifted type."
Maybe only since C++11 there is the restriction to shift width? Don't you know the standard about it?


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https://reviews.llvm.org/D141192