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I'd suggest someone try fixing this & see if it breaks anything that can't reasonably be fixed (before we go assuming this is by design/shouldn't be fixed just because it's the way it is today). On Wed, Apr 4, 2018 at 7:16 AM Riyaz Puthiyapurayil via llvm-dev < llvm-dev at lists.llvm.org> wrote: > It won't move the sign bit, so negative values won't fit,

It won't move the sign bit, so negative values won't fit, unless you have a 3 bit signed type ;) Note that if you assign negative values to and then read from a signed bit-field, you would do sign extension. So 3-bit signed types do exist in C++. It begs the question why PointerIntPair supports signed int types if it always loses the sign. Is it just to avoid signed/unsigned comparison

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