Bernd Edlinger <bernd.edlin...@hotmail.de> writes:
>>
>> Jakub Jelinek <ja...@redhat.com> wrote:
>>>On Mon, Jan 06, 2014 at 10:27:06AM +0000, Richard Sandiford wrote:
>>>> Of course, IMO, the cleanest fix would be to use switchable targets
>>>> for i386...
>>>
>>>We IMHO want that anyway, e.g. #pragma omp declare simd tests take eons
>>>to
>>>compile because even with just a few routines in a CU there are
>>>hundreds or
>>>thousands of IRA reinitializations.
>>
>> We also want a big fat comment before the non-obvious order of inits
>> when switching cfuns.
>>
>> Bernd, please revert your patch for now.
>>
>
> OK, reverted for now.
Thanks Bernd. (And sorry for the tone of my original message -- wasn't happy
with that when I read it back.)
How about this patch for the big comment?
Thanks,
Richard
gcc/
* function.c (invoke_set_current_function_hook): Add more commentary.
Index: gcc/function.c
===================================================================
--- gcc/function.c 2014-01-06 19:09:27.821167117 +0000
+++ gcc/function.c 2014-01-06 19:15:27.764240857 +0000
@@ -4405,9 +4405,23 @@ invoke_set_current_function_hook (tree f
cl_optimization_restore (&global_options, TREE_OPTIMIZATION (opts));
}
+ /* Give the target an opportunity to change the global state in
+ response to function attributes. This includes picking the
+ correct value of this_target on SWITCHABLE_TARGET targets.
+
+ Note that this_target (and in particular this_target_optabs)
+ should always reflect the target state with default optimization
+ options. We therefore call the target hook first and then apply
+ any function-specific optimization options on top. */
targetm.set_current_function (fndecl);
+
+ /* Set this_fn_optabs appropriately, on the assumption that we
+ want the default optimization options. */
this_fn_optabs = this_target_optabs;
+ /* Now adjust this_fn_optabs if using non-default optimization options.
+ init_tree_optimization_optabs ensures that the cached value of
+ TREE_OPTIMIZATION_OPTABS (opts) is correct for this_target. */
if (opts != optimization_default_node)
{
init_tree_optimization_optabs (opts);
