Is it OK for rtx_addr_can_trap_p_1 to attempt to compute the frame layout? (was Re: [PATCH] Skip re-computing the mips frame info after reload completed)

[Bernd Schmidt]

On 02/01/2016 01:49 PM, Richard Biener wrote:

> What prevents motion of those across a stack adjustment (thus a place
> they are _not_ valid?)

If the address is SP-based, dependencies on the address register. If 
you're thinking prologue stack adjustments, ports where this could be an 
issue emit suitable barrier insns.


Bernd