I'm not sure this is true.
The stack slots hold temporaries which are spilled from registers and
local variables, which may be held in registers temporarily. But the
clobbers and constraints invalidate all the registers (except EBP which
is saved), so everything that has a stack slot will be stored there
before the switch, and restored afterwards as required.
I put "memory" in the clobber list because, well, memory might change :-)
-- Jamie
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