On Tue, Apr 24, 2007 at 08:55:24PM +0300, Dorit Nuzman wrote: > "H. J. Lu" <[EMAIL PROTECTED]> wrote on 24/04/2007 01:03:25: > ... > > > > There are > > > > [EMAIL PROTECTED] vect]$ cat pmovzxbw.c > > typedef unsigned char vec_t; > > typedef unsigned short vecx_t; > > > > in > > > > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31667 > > > > By the way, this PR says "Integer externsions aren't vectorized" - but I > think the testcase you are referring to does get vectorized, only not as > efficiently as you would want it to (right?).
I was referring to extensions including things like V2QI -> V2DI. > It > > isn't easy to move N/2 high elemenets to N/2 low elemenets. > > just curious - why is it difficult? (couldn't you use a psrldq? is it too > expensive?) It needs more instructions. H.J.
