This is the mail archive of the
gcc-patches@gcc.gnu.org
mailing list for the GCC project.
Re: [PATCH 3/6] Implement interleave via permutation.
On Fri, 28 Oct 2011, Richard Henderson wrote:
> VEC_UNPACK_HI_EXPR and VEC_UNPACK_LO_EXPR need even more -- at
> least for signed -- a source of sign-extended data. Either a LT
> comparison that produces -1 (common, but not universal) or an
> ASHIFTRT with a constant. We're definitely in the land of
> diminishing returns here.
Right, I only meant to refer to the zero-extending variant.
brgds, H-P