[Bug rtl-optimization/59999] [4.9 Regression] Sign extension in loop regression blocks generation of zero overhead loop

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59999

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Apart from expand there is the redundant-extension-elimination, ree.c.