On Tue, 2012-01-10 at 12:20 -0500, Vladimir Makarov wrote:
Do we really need or want to create shuffle copies for insns that do not
have a two operand constraint?
Yes, I think so. As I remember I did some benchmarking and it gave some
"order" in hard register assignments and improved code slightly (at
least for SPEC2000) even for 3-ops insn architectures.
Ok, I'll have someone on my team kick off this patch on ppc, but it would
be nice if someone else could do the runs on x86/x86_64 or other cpus that
might be affected that we don't have access to.