[Bug tree-optimization/102392] Failure to optimize a sign extension to a zero extension

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102392

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Note w/o explicit ZEXT_EXPR / SEXT_EXPR the GIMPLE for non-"natural" extensions
is more costly (more stmts) than the "natural" extension based on the sign
of the object because it requires an intermediate sign changing conversion.