stdc_bit_ceil(3) and wrapping

[Joseph Myers]

On Fri, 30 Dec 2022, Alejandro Colomar via Gcc wrote:

> For the C standard, shifts have wrap around semantics for unsigned types:

Only if the shift count is nonnegative and strictly less than the width of 
the type.  This is about shifting by an amount equal to the width of the 
type, which has undefined behavior.

-- 
Joseph S. Myers
joseph@codesourcery.com