[Patch AArch64] Implement Vector Permute Support

[pinskia@gmail.com]

> On Jan 14, 2014, at 7:19 AM, Alex Velenko <Alex.Velenko@arm.com> wrote:
> 
> Hi,
> 
> This patch turns off the vec_perm patterns for aarch64_be, this should resolve
> the issue  highlighted here http://gcc.gnu.org/ml/gcc-patches/2014-01/msg00321.html
> With this patch applied, the test case provided in that link compiles without an ICE.
> 
> However, the Big-Endian port is still in development. This patch exposes
> another known but unrelated issue with Big-Endian Large-Int modes.
> 
> The patch has been tested on aarch64-none-elf and aarch64_be-none-elf resulting in five
> further regression due to the broken implementation of Big-Endian Large-Int modes.
> 
> Kind regards,
> Alex Velenko
> 
> gcc/
> 
> 2014-01-14  Alex Velenko  <Alex.Velenko@arm.com>
> 
>    * config/aarch64/aarch64-simd.md (vec_perm<mode>): Add BE check.
>    * config/aarch64/aarch64.c (aarch64_expand_vec_perm): Add comment.
> 
> gcc/testsuite/
> 
> 2014-01-14  Alex Velenko  <Alex.Velenko@arm.com>
> 
>    * lib/target-supports.exp
>    (check_effective_target_vect_perm): Exclude aarch64_be.
>    (check_effective_target_vect_perm_byte): Likewise.
>    (check_effective_target_vect_perm_short): Likewise.

I think you want to use a function to check if the target is effectively big-endian instead.  Internally at Cavium, our elf compiler has big-endian multi-lib. 

Thanks,
Andrew

> 
> <vec-perm.patch>