[Bug target/43129] Simplify global variable's address loading with option -fpic

[stephen.clarke at st dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43129

--- Comment #10 from Stephen Clarke <stephen.clarke at st dot com> 2010-10-14 17:01:47 UTC ---
OK, I can see that the ARM ARM states for Rm == PC then its unpredictable.

But for Rn == PC, I can only see that its unpredictable if W is 1
or P is 0  (I am looking at encoding A1).  So I am struggling to
understand that:

   ldr     r3, [pc,r3]

is unpredictable.  Forgive me if I made a mistake, my knowledge of
ARM is a little rusty.