Hi all,

Seems like aarch64 is suffering from something similar to PR 69245 as well.
If a target pragma sets the target state to the same as the target_option_default_node
the node is just a pointer to target_option_default_node rather than a distinct identical
node. So we must still restore the target globals even when setting to target_option_default_node
in order to force the midend to recompute the availability of various optabs.

If we don't do it, we can get in a problem like in the testcase where the isa_flags are all
set correctly, but the optab HAVE_* predicates have not been recomputed.

There is also a related issue present when popping/resetting target pragmas for which
I'll send out a patch separately.

Bootstrapped and tested on aarch64.

Ok for trunk?
Thanks,
Kyrill


2016-02-25  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

     PR target/69245
     * config/aarch64/aarch64.c (aarch64_set_current_function): Save/restore
     target globals when switching to target_option_default_node.

2016-02-25  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

     PR target/69245
     * gcc.target/aarch64/pr69245_1.c: New test.