[patch, ARM] Change default vector size to 128 bits - take 3

[Ira Rosen]

On 17 August 2011 15:49, Richard Earnshaw <rearnsha@arm.com> wrote:
> On 16/08/11 10:28, Ira Rosen wrote:
>> Hi,
>>
>> This patch changes the default vector size for auto-vectorization on
>> ARM NEON to 128 bits. This new version is a result of a discussion
>> with Richard and Ramana.
>>
>> wwwdocs changes will follow shortly.
>>
>> Bootstrapped and tested on arm-linux-gnueabi. The testsuite changes
>> were also checked on powerpc64-suse-linux and x86_64-suse-linux.
>>
>> There is one new failure:
>> gcc.c-torture/execute/mode-dependent-address.c fails with -O3
>> -funroll-loops with this patch or with -mvectorize-with-neon-quad.
>> Ramana has a patch to fix this
>> http://gcc.gnu.org/ml/gcc/2011-08/msg00284.html. I will wait with
>> committing my patch until this issue is resolved.
>>
>> OK for mainline?
>>
>> Thanks,
>> Ira
>>
>> ChangeLog:
>>
>>    * config/arm/arm.c (arm_preferred_simd_mode): Check
>>    TARGET_NEON_VECTORIZE_DOUBLE instead of
>>    TARGET_NEON_VECTORIZE_QUAD.
>>    (arm_expand_sync): Likewise.
>>    * config/arm/arm.opt (mvectorize-with-neon-quad): Make inverse
>>    mask of mvectorize-with-neon-double.  Add RejectNegative.
>>    (mvectorize-with-neon-double): New.
>>
>> testsuite/ChangeLog:
>>
>>    * lib/target-supports.exp (check_effective_target_vect_multiple_sizes):
>>    New procedure.
>>    (add_options_for_quad_vectors): Replace with ...
>>    (add_options_for_double_vectors): ... this.
>>    * gfortran.dg/vect/pr19049.f90: Expect more printings on targets that
>>     support multiple vector sizes since the vectorizer attempts to
>>     vectorize with both vector sizes.
>>    * gcc.dg/vect/no-vfa-vect-79.c,
>>     gcc.dg/vect/no-vfa-vect-102a.c, gcc.dg/vect/vect-outer-1a.c,
>>     gcc.dg/vect/vect-outer-1b.c, gcc.dg/vect/vect-outer-2b.c,
>>     gcc.dg/vect/vect-outer-3a.c, gcc.dg/vect/no-vfa-vect-37.c,
>>     gcc.dg/vect/vect-outer-3b.c, gcc.dg/vect/no-vfa-vect-101.c,
>>     gcc.dg/vect/no-vfa-vect-102.c, gcc.dg/vect/vect-reduc-dot-s8b.c,
>>     gcc.dg/vect/vect-outer-1.c, gcc.dg/vect/vect-104.c: Likewise.
>>    * gcc.dg/vect/vect-42.c: Run with 64 bit vectors if applicable.
>>    * gcc.dg/vect/vect-multitypes-6.c, gcc.dg/vect/vect-52.c,
>>    gcc.dg/vect/vect-54.c, gcc.dg/vect/vect-46.c, gcc.dg/vect/vect-48.c,
>>    gcc.dg/vect/vect-96.c, gcc.dg/vect/vect-multitypes-3.c,
>>    gcc.dg/vect/vect-40.c: Likewise.
>>   * gcc.dg/vect/vect-outer-5.c: Remove quad-vectors option as
>>    redundant.
>>   * gcc.dg/vect/vect-109.c, gcc.dg/vect/vect-peel-1.c,
>>    gcc.dg/vect/vect-peel-2.c, gcc.dg/vect/slp-25.c,
>>    gcc.dg/vect/vect-multitypes-1.c, gcc.dg/vect/slp-3.c,
>>    gcc.dg/vect/no-vfa-pr29145.c, gcc.dg/vect/vect-multitypes-4.c:
>>    Likewise.
>>  * gcc.dg/vect/vect-peel-4.c: Make ia global.
>>
>
> Ok with the following change:
>
>>  static unsigned int
>>  arm_autovectorize_vector_sizes (void)
>>  {
>> -  return TARGET_NEON_VECTORIZE_QUAD ? 16 | 8 : 0;
>> +  return TARGET_NEON_VECTORIZE_DOUBLE ? 0 : 16 | 8;
>>  }
>
>
> Please put parentheses round the expression to make the precedence explicit.

I added parentheses and committed the patch.

Thanks,
Ira

>
> R.
>
>