On Wed, Nov 20, 2013 at 2:00 PM, Bill Schmidt
<wschm...@linux.vnet.ibm.com> wrote:
> Hi,
>
> This patch corrects the various vsx_set_* and vsx_extract_* patterns to
> work correctly with little endian. For the most part this requires the
> usual "subtract from N-1" modification, where N is the number of
> elements.
>
> Extracting element zero for big endian V2DI or V2DF mode is optimized
> using the scalar register equivalence. Since we can similarly optimize
> extraction of element one for big endian V2DI or V2DF mode, I added a
> variant that does this. I am not sure how useful this is, and we can
> remove it if you like.
>
> The existing testcase gcc.target/powerpc/pr48258-1.c fails when counting
> the number of occurrences of xxsldwi. It expects to see 6, but we
> generate 9 of them for LE. This is because there are three extracts of
> element zero of a V4SF in the testcase. The scalar equivalence allows
> us to avoid the xxsldwi in BE but not in LE. Therefore I've disabled
> this test for little endian.
>
> Bootstrapped and tested on powerpc64{,le}-unknown-linux-gnu with no
> regressions. Is this ok for trunk?
>
> Thanks,
> Bill
>
>
> gcc:
>
> 2013-11-20 Bill Schmidt <wschm...@linux.vnet.ibm.com>
>
> * config/rs6000/vsx.md (vsx_set_<mode>): Adjust for little endian.
> (vsx_extract_<mode>): Likewise.
> (*vsx_extract_<mode>_one_le): New LE variant on
> *vsx_extract_<mode>_zero.
> (vsx_extract_v4sf): Adjust for little endian.
>
>
> gcc/testsuite:
>
> 2013-11-20 Bill Schmidt <wschm...@linux.vnet.ibm.com>
>
> * gcc.target/powerpc/pr48258-1.c: Skip for little endian.
Okay.
And thanks for the optimization to extract element one for LE.
Thanks, David
