[Bug target/112108] New: [aarch64] Some intrinsics are not correctly enabled when using 'target' attributes

[Bug target/112108] New: [aarch64] Some intrinsics are not correctly enabled when using 'target' attributes

[andrew.carlotti at arm dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112108

            Bug ID: 112108
           Summary: [aarch64] Some intrinsics are not correctly enabled
                    when using 'target' attributes
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: andrew.carlotti at arm dot com
  Target Milestone: ---

Intrinsics gated by the +memtag, +ls64 and +tme features are currently only
available if the feature was enabled in the global target settings. Their
availability needs to be adjusted for individual functions, taking into account
any local changes to the enabled features (e.g. using 'target' attributes).

I'll post patches to fix this shortly.

[Bug target/112108] [aarch64] Some intrinsics are not correctly enabled when using 'target' attributes

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112108

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |rejects-valid, wrong-code
                 CC|                            |pinskia at gcc dot gnu.org
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2023-11-04
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.
One example is:
```
#include <arm_acle.h>

#pragma GCC push_options
#pragma GCC target ("+nothing+memtag")

void *f(void *ptr, unsigned long long mask)
{
  return __arm_mte_create_random_tag(ptr, mask);
}

#pragma GCC pop_options
```
Currently this fails with C++ due to __builtin_aarch64_memtag_irg not being
defined.