Patch to split x86 DImode constant shifts.

[Jan Hubicka]

On Tue, Apr 13, 1999 at 01:44:17PM -0400, John Wehle wrote:
> This patch adds a splitter for DImode constant shifts.
Hi,
this patch is also similar to one I've made few months ago.
Maybe you can split even the part involvling shld insturction.
In the i386.md file I sent you you can find the insn pattern for it.

Advantage of this solution is better shecudling and the fact that
the shld insn pattern can match with constructions like
a = (a>>8) | (b<<24);

Honza