[TF-M] SPM crashes when built with any non zero optimization level

Is anyone else having the problem that enabling optimizations when building the secure image causes the secure partition manager to crash when entered through any of the psa_xxx() IPC veneers? Using GCC -O1, -O2, or -O3 compile options, something seems to go wrong with the SVC context. Everything behaves correctly when built with no optimizations.

Alan