[Bug target/82150] Produces a branch prefetch which causes a hang

[david.welch at netronome dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82150

--- Comment #3 from david.welch at netronome dot com ---
The problem exists as well with ldr pc,[something].  I have not dug through gcc
but did some compilation experiments, not nearly enough to be 100% sure, but
for switch statements the code generated always appears to do a comparison
(perhaps after a subtract or other modification, an ldrls pc,[], then an
unconditional branch to deal with the last item (or a default).  If that is
always the rule that is safe.  And for a function table, an array of function
pointers, it did the math using gprs and then a mov lr,pc ; bx rn.

an 

ldr pc,[]
literal pool data

will cause this undesired prefetch.