[PATCH, PR52252] Vectorization for load/store groups of size 3.

[Rainer Orth]

Evgeny Stupachenko <evstupac@gmail.com> writes:

> Patch with fixes attached.
> Currently if-structure is as following:
> +      if (count == 3)
> ...
> +      else
> +       {
> +         /* If length is not equal to 3 then only power of 2 is supported.  */
> +         gcc_assert (exact_log2 (count) != -1);
>
> For stores group I've created another mail thread.
[...]
>>> 2014-05-06  Evgeny Stupachenko  <evstupac@gmail.com>
>>>
>>>        PR tree-optimization/52252
>>>        * gcc.dg/vect/pr52252-ld.c: Test on loads group of size 3.

This test FAILs on sparc-sun-solaris2.11, both 32 and 64-bit:

FAIL: gcc.dg/vect/pr52252-ld.c scan-tree-dump-times vect "vectorized 1 loops" 1
FAIL: gcc.dg/vect/pr52252-ld.c -flto -ffat-lto-objects  scan-tree-dump-times vect "vectorized 1 loops" 1

The dumps have

/vol/gcc/src/hg/trunk/local/gcc/testsuite/gcc.dg/vect/pr52252-ld.c:10:3: note: not vectorized: relevant stmt not supported: in0_9 = *in_27;
/vol/gcc/src/hg/trunk/local/gcc/testsuite/gcc.dg/vect/pr52252-ld.c:7:1: note: vectorized 0 loops in function.

	Rainer

-- 
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Rainer Orth, Center for Biotechnology, Bielefeld University