[PATCH AArch64]: Add constraint letter for stack_protect_test pattern)

[pinskia@gmail.com]

> On Sep 17, 2014, at 7:43 AM, James Greenhalgh <james.greenhalgh@arm.com> wrote:
> 
> 
>> On Wed, Sep 17, 2014 at 09:30:31AM +0100, Richard Earnshaw wrote:
>> "=&r" is correct for an early-clobbered scratch.
>> 
>> R.
> 
> In that case...
> 
> How is the attached patch for trunk? I've bootstrapped it on AArch64
> with -fstack-protector-strong and -frename-registers in the BOOT_CFLAGS
> without seeing any issues.
> 
> OK?
> 
> Thanks,
> James
> 
> ---
> gcc/
> 
> 2014-09-15  James Greenhalgh  <james.greenhalgh@arm.com>
> 
>   * config/aarch64/aarch64.md (stack_protect_test_<mode>): Mark
>   scratch register as an output to placate register renaming.
> 
> gcc/testsuite/
> 
> 2014-09-15  James Greenhalgh  <james.greenhalgh@arm.com>
> 
>   * gcc.target/aarch64/stack_protector_set_1.c: New.
>   * gcc.target/aarch64/stack_protector_set_2.c: Likewise.

There is nothing aarch64 specific about this testcase so I would place them under gcc.dg and add the extra marker which says this testcase requires stack protector.   And maybe even use compile instead of just assemble too. 

Thanks,
Andrew

> <0001-Re-PATCH-AArch64-Add-constraint-letter-for-stack_pro.patch>