On Fri, 2 Sep 2016, Robin Dapp wrote: > This causes a performance regression in the xalancbmk SPECint2006 > benchmark on s390x. At first sight, the produced asm output doesn't look > too different but I'll have a closer look. Is the fwprop order supposed > to have major performance implications?
No, the change may allow a more copy propagation in loops but I didn't expect any major code generation changes from it. I've mainly done the change for consistency (for a forward SSA propagation pass RPO oder is the proper one). So if you can come up with a testcase I can investigate if the change is undesired. Thanks, Richard.
