eval: Avoid implementation-defined unsigned to signed conversions

Instead, use an additional int64_t member in the union. Since
exact-width integer types have no padding bits or trap representations,
and use two's-complement representation, we can portably access an
int64_t union member stored as uint64_t and vice-versa.

This allows us to reinterpret the value without invoking potentially
implementation-defined behavior of casting an unsigned integer to
a signed integer type which may not be able to represent its value.

0 files changed, 0 insertions, 0 deletions