[PATCH, AArch64] Fix for PR61202

[Carrot Wei]

Hi James

Thank you for pointing this out. In the new patch I removed the
modification of vqdmulh_n_s32 and vqdmulhq_n_s32.

Passed dejagnu testing on aarch64 qemu again. OK for trunk, 4.9 and 4.8?

2014-05-20  Guozhi Wei  <carrot@google.com>

        * config/aarch64/arm_neon.h (vqdmulh_n_s16): Change
        the last operand's constraint.
        (vqdmulhq_n_s16): Likewise.

On Mon, May 19, 2014 at 11:50 PM, James Greenhalgh
<james.greenhalgh@arm.com> wrote:
> On Tue, May 20, 2014 at 07:18:40AM +0100, Carrot Wei wrote:
>> Hi
>
> Hi,
>
>> The last operand of instruction sqdmulh can only be low fp registers,
>> so we should use constraint "x". But the intrinsic functions use "w".
>> This patch fixed the constrains in these intrinsics.
>
> This restriction is only on the _s16 variants of the intrinsics. From the
> ARMv8 Architecture Reference Manual:
>
>   <Vm> Is the name of the second SIMD&FP source register,
>   [...]
>   Restricted to V0-V15 when element size <Ts> is H.
>
> The patch is correct (though I can't approve it) for vqdmulh_n_s16 and
> vqdmulhq_n_s16, but the two hunks for vqdmulh_n_s32 and vqdmulhq_n_s32 should
> be dropped as they are too restrictive.
>
> Thanks,
> James
>
>> 2014-05-19  Guozhi Wei  <carrot@google.com>
>>
>>         * config/aarch64/arm_neon.h (vqdmulh_n_s16): Change
>>         the last operand's constraint.
>>         (vqdmulh_n_s32): Likewise.
>>         (vqdmulhq_n_s16): Likewise.
>>         (vqdmulhq_n_s32): Likewise.
>
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