[Bug tree-optimization/68695] [6 Regression] Performance regression related to ssa patch / ifcvt

[aoliva at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68695

--- Comment #14 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
The reason we don't coalesce on s390 is that there's no PROMOTE_MODE defined
there, so i_1 and j_2 promote to SImode, whereas x_3 and y_4, being function
arguments, promote to DImode as per s390_promote_function_mode.