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

[vogt at linux dot vnet.ibm.com]

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

--- Comment #18 from Dominik Vogt <vogt at linux dot vnet.ibm.com> ---
Defining PROMOTE_MODE is not really an option on S/390.  Whether it's
profitable or expensive to promote a value mostly depends on the way a value is
used and the context.  Experiments with using PROMOTE_MODE with the Spec20006
testsuite result in many thousands additional instructions overall (but some
tests actually get smaller).